Denver to Seattle flights
The cheapest round trip we found from Denver to Seattle is $145 (Feb 14 – 16, 2027, 1 stop).
DEN to SEA · Round trip · Economy · Prices per person in USD · Price found (2 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $443 |
| December 2026 | No fares found yet |
| January 2027 | No fares found yet |
| February 2027 | $145 (cheapest month) |
Cheapest dates in the next 4 months
Round trip, per person-
Feb 14 – 16, 2027 2 nights · leave Sun$145$145 Book
Southwest Airlines 1 stop · 6h 50m -
Feb 14 – 17, 2027 3 nights · leave Sun$146$146 Book
Southwest Airlines 2 stops · 6h 15m
-
Nov 25 – 29 4 nights · leave Wed$443$443 Book
Frontier Airlines 1 stop · 5h 28m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in Seattle
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Airport transfer to Seattle
Fixed prices from SEA on KiwitaxiTo see transfer prices here, turn on partner content in .
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Plan the rest of your trip
Seattle · Feb 14 – 16, 2027Partner links: we may earn a commission if you book, at no extra cost to you.
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Flights to Seattle from other cities
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- Ontario $176 −32%
Denver to Seattle: questions
How much does a flight from Denver to Seattle cost?
The cheapest round trip we have found right now is $145, leaving February 14 and returning February 16. Prices are per person, economy, in USD.
Which airports do Denver to Seattle flights use?
Denver airports include Denver International (DEN) and Centennial (APA). Seattle airports include Seattle-Tacoma International (SEA) and Boeing Field International (BFI). The prices on this page cover every airport in both cities (DEN and SEA are the city codes).
About this route
We track round-trip economy fares from Denver (United States) to Seattle (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $145, departing February 14 and returning February 16. The cheapest month to fly in our data is February, from $145. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.