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Cheap flights from Denver to Seattle

Recently found return fares from $74, with November the cheapest month we know of. Compare dates, then book with the partner you choose.

Cheapest months to fly

Lowest recently found return fare in each month. Tap a month to see that month's calendar.

$143 Oct2026 $74 Nov2026

Denver → Seattle

November 2026

Mon Tue Wed Thu Fri Sat Sun 1 2 3 4 $79 5 $109 6 $80 7 $74 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
LowerHigherLowest this month

Lowest fares for the best day

  • Frontier AirlinesSat 14 Nov – Mon 16 Nov · Direct · 3h 08m $164
  • Frontier AirlinesFri 6 Nov – Sat 7 Nov · Direct · 3h 08m $168
  • Alaska AirlinesWed 25 Nov – Sun 29 Nov · Direct · 3h 09m $310
See all flights for these dates

Airport in Seattle

  • SEASeattle-Tacoma

Airport in Denver

  • DENDenver International

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DEN
SEA

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More trips from Denver

All flights from Denver Seattle to Denver flights
Los Angelesfrom $60 Dallasfrom $88 DTTfrom $112 Chicagofrom $146 Miamifrom $148 MSYfrom $155 Houstonfrom $163 INDfrom $195

FAQ

Questions about this route

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Help center Contact us
01What is the cheapest month to fly from Denver to Seattle?

Based on recently found fares, November 2026 has the lowest price we know of, from $74. Prices change often, so check the calendar for current fares.

02Are the prices on this page final?

No. They are recently found fares. When you open a deal, the partner shows the live price, including taxes and fees, before you pay.

03How can I get an alert when flights to Seattle get cheaper?

Use the price alert on this page. Choose your dates or a whole month and we will email you when the fare drops.