SEA

$53 Find Cheap Flights from Colorado to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 9/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

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Flights Deals

Cheap Flights from Colorado to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Colorado to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Colorado to Seattle

Wed, Jul 30 - Sat, Aug 2
Frontier Logo
9:36 pm - 11:42 pmDEN-SEA
3h 06mnonstop
Frontier Logo
7:48 pm - 11:40 pmSEA-DEN
2h 52mnonstop
$85Frontier
Find Deal
Tue, Jul 29 - Sat, Aug 2
Frontier Logo
9:36 pm - 11:42 pmDEN-SEA
3h 06mnonstop
Frontier Logo
6:25 am - 10:14 amSEA-DEN
2h 49mnonstop
$87Frontier
Find Deal
Thu, Sep 4 - Tue, Sep 9
Delta Logo
6:50 pm - 10:14 pmGJT-SEA
4h 24m1 stop
Delta Logo
5:30 am - 10:30 amSEA-GJT
4h 00m1 stop
$211Delta
Find Deal
Wed, Aug 27 - Sat, Aug 30
Delta Logo
5:55 pm - 10:20 pmCOS-SEA
5h 25m1 stop
Delta Logo
11:55 pm - 10:16 amSEA-COS
9h 21m1 stop
$217Delta
Find Deal
Sun, Aug 31 - Fri, Sep 12
Southwest Logo
1:40 pm - 10:50 pmCOS-SEA
10h 10m1 stop
Southwest Logo
4:20 pm - 10:35 pmSEA-COS
5h 15m1 stop
$218Southwest
Find Deal
Thu, Aug 7 - Tue, Aug 12
Southwest Logo
6:55 pm - 12:15 amCOS-SEA
6h 20m1 stop
Southwest Logo
10:45 pm - 1:40 pmSEA-COS
13h 55m2 stops
$228Southwest
Find Deal
Wed, Sep 10 - Wed, Sep 17
United Airlines Logo
1:25 pm - 5:51 pmHDN-SEA
5h 26m1 stop
United Airlines Logo
5:02 am - 12:21 pmSEA-HDN
6h 19m1 stop
$239United Airlines
Find Deal
Wed, Sep 10 - Wed, Sep 17
United Airlines Logo
1:25 pm - 5:51 pmHDN-SEA
5h 26m1 stop
United Airlines Logo
6:25 am - 8:03 pmSEA-HDN
12h 38m2 stops
$244United Airlines
Find Deal
Mon, Aug 11 - Thu, Aug 21
American Airlines Logo
6:27 am - 2:51 pmCOS-SEA
9h 24m1 stop
American Airlines Logo
12:58 am - 10:02 amSEA-COS
8h 04m1 stop
$287American Airlines
Find Deal
Tue, Sep 9 - Tue, Sep 16
American Airlines Logo
7:15 am - 2:34 pmDRO-SEA
8h 19m1 stop
American Airlines Logo
10:09 am - 7:59 pmSEA-DRO
8h 50m1 stop
$298American Airlines
Find Deal
Useful Info

Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$53
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly with an average 17% increase in price.
Flight from Denver to Seattle

Flights from Colorado to Seattle: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Colorado to Seattle 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with DeltaDEN-SEAJun 2025
If you are on the left side of the plane you should spot Mt. Rainer on your way into Seattle.
Verified travelerFlew with Alaska AirlinesDEN-SEAOct 2024
Go early, it’s a big airport. There are two TSA screening areas, one might be more crowded than the other. From checking it to the gate give yourself at least 20-30 minutes to get there.

FAQs for booking flights from Colorado to Seattle

  • How does KAYAK find such low prices on flights from Colorado to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Colorado to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Colorado to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Colorado is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Colorado to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Colorado with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Colorado to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)

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