Flights from Seattle to Denver
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From $322 · Prices update daily
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The quick answer
Flights from Seattle to Denver start around $322 round-trip. Main carrier: Frontier Airlines. Cheapest month to fly: July.
Price calendar — next 60 days
★ Cheapest: $322 on Tue, Jul 7 · F9
Lowest return fares · Prices update daily · Final price confirmed at booking
Price calendar — Seattle to Denver
Month-by-month lowest fares. Green = cheapest dates.
United States essentials
🇺🇸 Domestic flight — no passport required
Domestic flight — no passport required for US citizens. Bring REAL ID for security.
Full Denver visa guide →🆘 Emergency
911
💱 Currency
US Dollar ($)
🕐 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 Denver
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 Seattle to Denver trip against delays, cancellations, and medical emergencies. US travelers can compare plans from top insurers.
Airport transfer in Denver
Pre-book your ride into Denver. Fixed price, meet & greet, and a driver waiting at arrivals — no meter anxiety after a long flight.
Flight delayed or cancelled?
If your Seattle to Denver 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
Seattle to Denver — frequently asked
How much is a flight from Seattle to Denver?+
Fares start around $322 round-trip. Prices update daily across 800+ airlines.
What is the cheapest month to fly Seattle to Denver?+
July typically has the lowest fares.
Are there direct flights from Seattle to Denver?+
This route is usually served by connecting flights. Use the search above to check for any direct options on your dates.
Which airlines fly from Seattle to Denver?+
Carriers on this route include Frontier Airlines. Compare them side by side in the search above.
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