💰 When is the cheapest time to fly from San Francisco to Singapore?
This month: May fares climb as pre-summer demand builds; carrier samples ran high this month and the inter-monsoon brings afternoon thunderstorms.
SFO–Singapore round-trip economy swings from about $720 to $1,250 across the year — a roughly 70% spread.
September is the annual floor, when summer demand fades and Bay-Area travelers find the year's best value. October stays soft, and February–April is the dry-season sweet spot for weather.
The peaks are December–January above $1,200 on holiday and New Year return demand, plus Chinese New Year in February.
The Formula 1 night-race weekend in mid-September spikes specific dates even in a cheap month. June–October carries haze risk, which softens demand and helps fares in August–October.
✈️ Which airlines fly from San Francisco to Singapore?
Two carriers fly SFO–Singapore nonstop, both twice daily: Singapore Airlines on the A350-900 and United on the Boeing 787-9 from its Pacific hub.
For 1-stop value, EVA Air routes via Taipei and Cathay Pacific via Hong Kong — each adds 3–5 hours but can undercut nonstop fares.
The Bay-Area default for the nonstop.
The A350-900 carries three cabins; lie-flat business is the route's soft-service benchmark, and KrisFlyer redemptions are among the most useful in the alliance. Frequent flyers on SQTalk and flight-report consistently rate the cabin at the top of trans-Pacific.
Premium Economy runs a 2-4-2 layout — comfortable but a notch behind United's 2-3-2.
Watch the aircraft: the two-cabin A350-900ULR has historically rotated through and sells no economy, so check your date.
Best for: most Bay-Area travelers, KrisFlyer redemption holders, premium-cabin sleepers on the 17h haul, lie-flat business seekers
The frequency and network winner from SFO.
The Boeing 787-9 flies twice daily, and MileagePlus elites get the smoothest rebooking plus the Polaris Lounge at SFO — a genuine pre-flight asset before a 17-hour night.
Premium Plus premium economy uses a 2-3-2 layout with a differentiated meal service; trans-Pacific reviewers rate it above the A350's 2-4-2 for value.
Polaris business is solid but the soft service trails Singapore Airlines.
Best for: MileagePlus elites, Polaris Lounge users at SFO, Premium Plus value seekers, rebooking-flexibility travelers
The best value 1-stop for the route.
SFO–Taipei runs on the 777-300ER with Royal Laurel business — reverse-herringbone 1-2-1, 43-inch pitch, lie-flat, and an Armani amenity kit. The TPE–SIN leg adds about 4h 30m.
On Star Alliance award space it punches well above its cash fare, and a Taipei layover is a feature, not a bug, for food travelers.
Skip it if a connection risk on a tight itinerary outweighs the savings.
Best for: value-business seekers, Star Alliance redemptions, travelers who want a Taipei layover, Royal Laurel award hunters
The oneworld option — and only for loyalists.
SFO–Hong Kong runs about 15h 35m with high frequency, then HKG–SIN adds roughly 3h 30m. Total journey time lands near 20 hours, longer than either nonstop.
It earns and burns well for Alaska Mileage Plan and oneworld members, and a Hong Kong stopover can justify the routing.
For everyone else the nonstop wins on time-value — skip Cathay unless the miles or the stopover make the case.
Best for: oneworld/Alaska Mileage Plan members, frequent SFO-HKG fliers extending to Singapore, Hong Kong stopover seekers
Mubboo verdict: Singapore Airlines A350-900 is the Bay-Area default nonstop — lie-flat business and KrisFlyer lift it above United Polaris. United wins frequency and SFO lounge.
Prices shown are approximate averages based on recent searches (April 2026). Actual fares vary by date, class, and availability.
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Compare all flights →📅 When should you book San Francisco to Singapore flights?
Book economy about 40 days out for the best SFO-Singapore fares; the cheapest seats clear early in the September floor window.
Tuesday and Wednesday departures price below weekends, and a mid-week return saves more than the outbound. Premium cabins reward booking three to six months ahead, especially around the mid-September Formula 1 weekend and the December holidays.
Set a fare alert and pounce — the 17-hour nonstops sell their low fare buckets fast on this Bay-Area route.
M says: May starts the summer price climb — expect afternoon storms and firmer fares.
If you're a family flying in summer, book by March — peak season fills up fast.
Budget travelers: shoulder season (Sep–Oct, Apr–May) offers the best balance of price and weather.
💡 This May: Book May at least two months ahead; fares rise steadily into June.
🏙️ Why visit Singapore?
Singapore packs a continent of cultures into a walkable, hyper-efficient city-state.
In a single day you can eat Hainanese chicken rice at a Chinatown hawker stall, browse street art on Haji Lane in Kampong Glam, and watch the Supertree light show at Gardens by the Bay. The MRT is fast, clean, and cheap, and English is everywhere.
Marina Bay is the postcard skyline — Marina Bay Sands, the lotus ArtScience Museum, the Merlion. Tiong Bahru trades icons for 1930s Art Deco lanes and indie cafes.
It is tropical, green, and famously safe — the easiest first stop in Southeast Asia for a Bay-Area traveler.
What makes Singapore worth the flight:
How to spend 8 hours, 48 hours, or a week in Singapore.
8 hours (layover): ride the MRT to Gardens by the Bay, walk the Supertree Grove, then a hawker lunch at Lau Pa Sat before the Marina Bay waterfront.
48 hours: add Chinatown temples and Maxwell Food Centre, the Botanic Gardens (a UNESCO site), and a sunset on the Marina Bay Sands SkyPark.
A week: fold in Sentosa and Universal Studios, the Night Safari, Little India and the Tekka Market, and day-trip energy out to nearby islands or across to nearby Southeast Asia.
Pace outdoor time around the heat — mornings and evenings are kindest in the tropical humidity.
Best neighborhoods to explore:
The postcard Singapore: Marina Bay Sands, Gardens by the Bay, the Merlion, the ArtScience Museum, and a waterfront promenade. Modern, walkable, and lit up after dark.
Living heritage rather than a museum: the Buddha Tooth Relic Temple, the Sri Mariamman Hindu temple, and the legendary Maxwell Food Centre hawker stalls all within a few blocks.
Singapore's Malay-Muslim heart, anchored by the golden-domed Sultan Mosque, with Haji Lane's narrow streets packed with street art, indie boutiques, and late-night cafes.
One of Singapore's oldest housing estates, with 1930s Art Deco walk-ups, spiral staircases, indie bookshops, and some of the city's best third-wave coffee.
A sensory rush of flower garlands, spice shops, and ornate temples, with the Tekka Market wet stalls and some of Singapore's best South Indian food.
A tree-lined canyon of malls with one of the world's highest mall densities, from luxury boutiques to department stores, connected underground for the heat.
Don't miss:
Gardens by the Bay
The Supertree Grove and the climate-controlled Cloud Forest and Flower Dome conservatories. The free evening Garden Rhapsody light show is the city's signature spectacle.
Browse Gardens by the Bay tours →Marina Bay Sands SkyPark
The 57th-floor observation deck atop the three-tower hotel, with the best aerial view of the Marina Bay skyline. Go near sunset for the day-to-night transition.
Browse Marina Bay Sands SkyPark tours →Hawker centres (Maxwell / Lau Pa Sat / Newton)
Open-air food courts where Michelin-recognized chicken rice and char kway teow cost a few dollars. The truest, cheapest taste of Singapore.
Browse Hawker centres (Maxwell / Lau Pa Sat / Newton) tours →Sentosa & Universal Studios
A resort island with Universal Studios Singapore, beaches, and the S.E.A. Aquarium, reached by cable car or monorail. The family-day anchor.
Browse Sentosa & Universal Studios tours →Singapore Botanic Gardens
A UNESCO World Heritage site and the free National Orchid Garden, a cool green escape from the downtown heat and a morning-walk favorite.
Browse Singapore Botanic Gardens tours →Singapore Zoo & Night Safari
Consistently rated among the world's best zoos, with an open-concept design and the after-dark Night Safari tram through nocturnal habitats.
Browse Singapore Zoo & Night Safari tours →Chinatown temples & Clarke Quay
The Buddha Tooth Relic Temple by day and the riverside bars of Clarke Quay by night, an easy heritage-to-nightlife pairing along the Singapore River.
Browse Chinatown temples & Clarke Quay tours →M's take:
Base in Marina Bay for a first trip — the icons are walkable and the MRT reaches everything else fast.
For more character at a lower nightly rate, pick Tiong Bahru or Kampong Glam. Skip Orchard Road as a base unless shopping is the whole point; it is well connected but light on neighborhood soul.
🧳 What do you need to know before flying to Singapore?
🛂 Do Americans need a visa for Singapore?
Visa-free 90 days for US passports; SG Arrival Card is mandatory.
US citizens need no visa for tourism or business meetings up to 90 days. You must submit the free SG Arrival Card (SGAC) online within 3 days before arrival at eservices.ica.gov.sg/sgarrivalcard — there is no paper form, and failure to submit can mean denied boarding or entry.
Your passport must be valid at least 6 months beyond your departure date. As of March 2026 the US State Department rates Singapore Level 1 (Exercise Normal Precautions).
Working or earning Singapore income needs an Employment Pass arranged before arrival. Always confirm current rules at travel.state.gov and ica.gov.sg before you fly.
🕐 What's the time difference?
Singapore is 15–16 hours ahead of San Francisco, and westbound jet lag is the hard part.
Singapore runs on SGT (UTC+8) with no daylight saving, so it sits 15 hours ahead of San Francisco in summer (PDT) and 16 hours ahead in winter (PST). Your calendar jumps two days on the westbound flight.
Going west on a 17-hour flight is the brutal direction — aim for a late-evening SFO departure that lands Singapore before dawn, then push through to a normal local bedtime.
Eastbound home is gentler with a jet-stream tailwind shaving roughly an hour off the block.
🚇 How do you get from the airport to the city?
Changi Airport (SIN) to central Singapore: 30–45 minutes depending on mode. Four reliable options, all clearly priced after a 17-hour flight.
| Option | Cost | Time | Best for |
|---|---|---|---|
| Grab (ride-hailing) ✅ | SGD 20–35 (~$15–26) | ~30 min, no airport surcharge | Fixed price, zero transfers after a long-haul |
| MRT | SGD 1.50–2.20 (~$1.10–1.70) | 35–45 min (1 transfer at Tanah Merah) | Cheapest; light luggage |
| Taxi | SGD 25–45 (~$19–34) + S$6–8 surcharge | ~30 min | Metered, evening surcharge applies |
| Private transfer | From SGD 60 (~$45) | ~30 min, meet-and-greet | Families, fixed pickup with kids and bags |
Editor's pick: Grab for the locked fare and no Tanah Merah transfer; take the MRT only if you are traveling light. Fares as of 2026.
💷 What about money and tipping?
Singapore uses the Singapore dollar (SGD) and is one of the most card-friendly cities on earth.
Carry a no-foreign-transaction-fee card — the Chase Sapphire Preferred, Capital One Venture, or Amex Platinum all waive FX fees and earn travel points. You can tap to pay almost everywhere, and tipping is not customary.
Keep some SGD cash for hawker centres, wet markets, and small vendors that prefer cash or PayNow. The exchange rate moves weekly, so check current rates rather than a fixed number.
Withdraw from a bank ATM on arrival; airport currency desks carry the weakest rates.
📱 Will your phone work?
An eSIM beats roaming for the 17-hour-away trip.
Your US phone will roam in Singapore on SingTel, StarHub, or M1, but AT&T and Verizon charge about $10–12/day. T-Mobile plans include international data at slower speeds — fine for maps and chat.
A travel eSIM from Saily, Airalo, or Yesim runs roughly $4–15 for a Singapore data plan and activates before you land.
Changi offers free Wi-Fi across all terminals and Jewel, so you can set up an eSIM on arrival if you skipped it at SFO.
✈️ Ready to book? Compare San Francisco to Singapore flights
Search flights →🛫 Flying from San Francisco — airport tips
SFO International Terminal — United gates (Star Alliance) (United)
- United Polaris Lounge sits past security in the International Terminal — Polaris business and eligible Star Alliance Gold passengers get access before the 17h night flight
- Twice-daily SFO-SIN frequency gives MileagePlus elites the best rebooking flexibility if a connection slips
- Use TSA PreCheck and Clear at the International checkpoint to cut the queue; allow extra time for the long gate walk
SFO International Terminal — Singapore Airlines & EVA Air (Star Alliance) (Singapore Airlines)
- Singapore Airlines and EVA Air both depart the Star Alliance wing of the International Terminal — confirm your A350-900 vs A350-900ULR aircraft at check-in since the ULR sells no economy
- KrisFlyer and Star Alliance Gold passengers can use the lounge before boarding; check-in opens around 3h 30m before departure for the long-haul
- EVA Air's SFO-Taipei leg leaves from the same wing, simplifying same-alliance award itineraries to Singapore
SFO International Terminal — Cathay Pacific (oneworld) (Cathay Pacific)
- Cathay Pacific departs the oneworld side of the International Terminal for the SFO-Hong Kong leg connecting to Singapore
- Alaska Mileage Plan and oneworld elites get priority check-in and lounge access — a useful perk before the ~20h total journey
- Allow a comfortable Hong Kong connection window; tight HKG transfers risk a missed HKG-SIN leg
🚐 Skip the hassle? Book a private airport transfer
Fixed price, meet & greet at arrivals, door-to-door service
💡 Insider tips: San Francisco to Singapore
Check whether your Singapore Airlines flight is the A350-900 or the two-cabin A350-900ULR — the ULR sells no economy at allMubboo original data
The aircraft determines your entry cabin on Singapore Airlines.
The standard A350-900 carries three cabins including Economy. The A350-900ULR — built for the carrier's longest routes — is configured in just two cabins, Business and Premium Economy, with no economy seats sold.
On SFO–Singapore the ULR has historically rotated through and is moving off this route around October 2026. If your date shows the ULR, the cheapest seat you can buy is Premium Economy, which changes the fare math entirely.
Pull up the aircraft type on the booking page before you commit — two flights the same day can offer different cabins.
On the 17-hour block, United's Premium Plus 2-3-2 beats the A350 premium-economy 2-4-2 for solo and couple travelersMubboo original data
Layout matters more than badge on an ultra-long-haul.
United's Premium Plus premium economy on the 787-9 uses a 2-3-2 layout with a differentiated meal service. Singapore Airlines' A350-900 premium economy runs 2-4-2 with a lighter meal concept.
We tracked cabin reviews across SQTalk, flight-report, and FlyerTalk, where trans-Pacific flyers repeatedly favor the 2-3-2 for aisle access — a couple gets a pair with one aisle, and solos avoid the dreaded middle of four.
If the fares are within a hundred dollars, the 787-9 Premium Plus is the more comfortable seat for the 17-hour night.
September is the SFO-Singapore fare floor — but dodge the mid-September Formula 1 weekend, which spikes specific datesMubboo original data
The cheapest month hides one expensive trap.
We tracked fares across major booking platforms and September consistently lands the annual economy floor, with October close behind. Summer demand fades and the holiday peak has not started.
The exception is the Formula 1 Singapore night-race weekend in mid-September, which spikes both fares and hotels for those specific dates. Book around it and you keep the floor; book into it and you pay a premium.
Aim 40-plus days out for economy, and set a fare alert — the low buckets on these twice-daily nonstops sell fast.
File your free SG Arrival Card within 3 days of arrival to keep your Changi immigration clearance fast
Singapore's entry form is digital and mandatory.
The SG Arrival Card (SGAC) replaced the paper landing card. Submit it free at eservices.ica.gov.sg/sgarrivalcard no earlier than 3 days before arrival, with your flight, accommodation, and health declaration.
Skip it and you risk being held at the counter — or denied boarding at SFO. File it on the plane's Wi-Fi if you forget, but earlier is safer.
Clearance at Changi is among the fastest in the world once the card is on file; automated lanes move eligible travelers through in minutes.
Singapore Airlines and EVA Air include two free checked bags in economy; United includes only one
The free-bag allowance differs between the nonstops.
Singapore Airlines and EVA Air both include 2 × 23kg checked bags in economy. United includes 1 × 23kg on most economy fares to Singapore, so a second bag costs extra unless you hold status or a co-branded card.
For families or anyone shopping Orchard Road, that second free bag tilts the math toward Singapore Airlines even at a slightly higher base fare.
Pack carry-on liquids for the long flight and keep some SGD cash handy for hawker stalls that prefer cash or PayNow over cards.
A 1-stop via Taipei or Hong Kong adds 3–5 hours but can unlock lie-flat award space when nonstops are full
When the nonstops are sold out or pricey, look one stop away.
EVA Air via Taipei (777-300ER Royal Laurel) and Cathay Pacific via Hong Kong both add 3–5 hours but often have award space when the nonstops do not. EVA is Star Alliance; Cathay is oneworld and Alaska Mileage Plan.
A deliberate Taipei or Hong Kong stopover can turn the connection into a feature. Watch the layover length — a tight transfer risks the onward leg.
For pure time-value the nonstop still wins; take the 1-stop for the seat, the miles, or the second city.
👥 Who flies this route — and what they should know
Bay-Area tech business traveler (engineer / founder / PM visiting the Singapore office)
Featured this monthRecommended: United 787-9 Polaris or Singapore Airlines A350-900 business.
For a Monday meeting in Singapore, lie-flat sleep is the whole game on the 17-hour westbound. United gives you the Polaris Lounge at SFO and the best MileagePlus rebooking; Singapore Airlines gives you the better cabin and KrisFlyer.
Book a late-evening SFO departure that lands Singapore before dawn two days later — shower, then push to local bedtime.
Anti-recommendation: do not schedule a sharp negotiation for arrival day. Day-one cognition runs at 70-80% after this block; protect the big session for day two.
Premium economy comfort seeker (wants more than economy without a business fare)
Recommended: United 787-9 Premium Plus.
On a 17-hour flight, the 2-3-2 Premium Plus layout beats Singapore Airlines' 2-4-2 premium economy for aisle access and a differentiated meal — couples get a pair, solos dodge the middle-of-four.
Premium-economy inventory is thin, so book early; the cabin sells out well before economy on popular dates.
If United's premium economy is gone, the A350-900 version is still a real upgrade over economy. Anti-recommendation: do not pay a near-business price for premium economy — at that point, buy the lie-flat.
Budget first-timer flying economy on a tight fare
Recommended: Singapore Airlines A350-900 economy, or EVA Air 1-stop via Taipei for savings.
Target the September floor near the annual low or October, and book 40-plus days out. Singapore Airlines' economy includes two free checked bags and the route's best service.
If the nonstop is pricey, EVA Air via Taipei often undercuts it; you trade 3–5 hours for the savings.
Base in Chinatown or Tiong Bahru for cheap hawker food and walkable heritage. Anti-recommendation: avoid a sub-2-hour Taipei or Hong Kong layover on a separate ticket — a missed connection has no protection.
Family with kids heading to Sentosa and Universal Studios
Recommended: Singapore Airlines A350-900 economy or premium economy.
Two free checked bags per passenger, bassinet rows, and a strong meal-and-entertainment program make Singapore Airlines the family pick for the overnight haul.
Book an evening SFO departure so the kids sleep through the middle of the 17-hour flight, and pre-book a private transfer so you are not wrangling strollers on the MRT after landing.
Base near Sentosa or Marina Bay for the theme parks and the Gardens by the Bay light show. Anti-recommendation: skip a 1-stop with young kids unless the savings are large — the connection doubles the misery.
Award and points redemption flyer chasing a lie-flat seat
Recommended: Singapore Airlines A350-900 business, or EVA Air Royal Laurel via Taipei.
KrisFlyer redemptions on Singapore Airlines' own metal are among the alliance's best uses; transfer from Amex MR, Chase, Citi, or Capital One and book Saver business when it opens.
If SQ award space is dry, EVA Air Royal Laurel on the 777-300ER is a superb Star Alliance redemption via Taipei and often has more seats.
Watch for award-space release windows. Anti-recommendation: do not burn miles on Cathay's ~20-hour 1-stop unless a Hong Kong stopover is the actual goal.
Stopover traveler continuing onward into Southeast Asia
Recommended: Singapore Airlines nonstop, or Cathay Pacific via Hong Kong for a deliberate stopover.
If Singapore is a hub for onward hops to Bali, Bangkok, or Kuala Lumpur, the nonstop gets you in fresh with a full day to connect at Changi.
If you want a free second city, Cathay via Hong Kong or EVA via Taipei lets you build in a stopover — just price the onward Southeast Asia legs separately to compare.
Anti-recommendation: do not book a tight self-transfer at Changi onto a budget carrier; leave a buffer so a delayed 17-hour arrival does not strand you.
Retiree foodie and culture traveler prioritizing comfort and weather
Recommended: Singapore Airlines A350-900 premium economy or business.
Comfort and low stress matter most on the ultra-long-haul, so favor a roomier cabin and travel in the February–April dry season when skies are clearest.
Base in walkable Tiong Bahru for cafes and Art Deco lanes, or Chinatown for hawker breakfasts steps from your door.
Pace outdoor sightseeing around the tropical heat — mornings and evenings are kindest. Anti-recommendation: avoid June–October travel if haze sensitivity is a concern; pack an N95 if you must go then.
⚖️ Flight delayed or canceled?
Singapore has no EC 261-equivalent automatic-compensation regime, so your protections depend on the carrier and your routing.
For flights operated by United, US DOT rules apply: you are owed a full refund for cancellations and significant schedule changes, and rebooking or a refund for long delays. The Montreal Convention covers baggage and delay liability on international itineraries.
Singapore Airlines, EVA Air, and Cathay Pacific operate under their own conditions of carriage plus local consumer-protection law — generally rebooking and care for controllable delays, but no fixed cash payout.
Travel insurance is the practical backstop on a 17-hour ticket: a missed connection or a medical event far from home costs far more than the premium. Keep receipts and file promptly.
📱 Stay Connected — Travel eSIM for Singapore
Free option: T-Mobile plans include slower international data free — enough for maps and WhatsApp if you skip the eSIM
Your US carrier will roam in Singapore, but AT&T and Verizon charge about $10–12/day. A travel eSIM runs roughly $4–15 for a Singapore data plan and activates before you land at Changi — maps, Grab, and chat work the moment you clear immigration.
🛡️ Protect the 17-Hour Trip — Travel Insurance
On an ultra-long-haul with no EC 261 safety net, a missed connection or a medical event far from home gets expensive fast. A policy covering trip interruption, baggage, and emergency medical is the practical backstop for a 17-hour Singapore itinerary, especially for families and award tickets.
🚕 Airport Transfer — Changi to Your Hotel
Free option: Solo or light travelers can take the MRT for SGD 1.50–2.20 — cheapest if you skip the transfer
After a 17-hour flight, a pre-booked private transfer beats wrangling bags onto the MRT. Fixed pickup, meet-and-greet, and a set price from Changi to your hotel — worth it for families, late arrivals, or anyone landing before dawn. Grab works too, but a booked car removes the after-flight friction.
Emergency contacts in Singapore
Frequently asked questions about San Francisco to Singapore flights
Budget about 17.5 hours airborne westbound and 16 eastbound — among the planet's longest scheduled hops.
The eastbound leg shaves roughly an hour thanks to a jet-stream tailwind. Your calendar skips ahead two days outbound because the destination sits 15–16 hours ahead of the Bay Area.
Pack a refillable water bottle, compression socks, and a sleep plan: hydration and one solid rest block make the ultra-long haul far more survivable than caffeine and films.
Researched by Mubboo Editorial Team · Reviewed by Richard Lee, Founder
Prices from Aviasales. Seasonal advice updated: May 2026 · Last editorial review: 2026-05-24 · Government info: travel.state.gov
Prices last updated 16h ago · cached fares aggregating 800+ airlines and agencies · Check real-time prices →
M verdicts are based on editorial research — not pulled from a database.