Flights from San Francisco to Ontario
Compare 800+ airlines · Book direct · No Mubboo fees
From $105 · Prices update daily
We don't sell anything. We compare — you choose the best deal.
The quick answer
Flights from San Francisco to Ontario start around $105 round-trip. Airlines on this route include: United Airlines, Frontier Airlines, Southwest Airlines (direct flights available). Cheapest month: October; peak: February (about +126%).
Price calendar — next 60 days
★ Cheapest: $105 on Thu, Jul 16 · Direct · F9
Lowest return fares · Prices update daily · Final price confirmed at booking
Price calendar — San Francisco to Ontario
Month-by-month lowest fares. Green = cheapest dates.
United States essentials
🇺🇸 Domestic flight — no passport required
Domestic flight — no passport required for US citizens. Bring REAL ID for security.
Full Ontario visa guide →🆘 Emergency
911
💱 Currency
US Dollar ($)
🕐 Time zone
UTC−5 to −10
🗣️ Language
English
🔌 Plugs
Type A/B · 120V
🚗 Driving
Right side
💡 Tipping
Expected — 15–20% at restaurants
📞 Dial code
+1
Entry rules can change — always confirm with official sources before booking.
Stay connected in Ontario
Skip roaming fees — get a local eSIM before you land. Works in 200+ countries and activates instantly, so you’re online the moment you touch down.
Travel insurance
Protect your San Francisco to Ontario trip against delays, cancellations, and medical emergencies. US travelers can compare plans from top insurers.
Airport transfer in Ontario
Pre-book your ride into Ontario. Fixed price, meet & greet, and a driver waiting at arrivals — no meter anxiety after a long flight.
Flight delayed or cancelled?
If your San Francisco to Ontario flight was delayed more than 3 hours or cancelled, you may be entitled to up to €600 in compensation under EU/UK rules — even if you flew a non-EU airline. Free to check, no win no fee.
More resources
San Francisco to Ontario — frequently asked
How much is a flight from San Francisco to Ontario?+
Fares start around $105 round-trip, ranging up to about $334 in peak periods. Prices update daily across 800+ airlines.
What is the cheapest month to fly San Francisco to Ontario?+
October typically has the lowest fares, while February is the most expensive (around +126%).
Are there direct flights from San Francisco to Ontario?+
Yes — direct flights are available on this route. Connecting itineraries are often cheaper.
Which airlines fly from San Francisco to Ontario?+
Carriers on this route include United Airlines, Frontier Airlines, Southwest Airlines. Compare them side by side in the search above.
Mubboo earns a commission when you book through our links. This does not affect the prices you see or our recommendations. Final prices are confirmed on the booking site.