SEA

$54 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 2/16. 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, 0 bags

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Everything you should know

Cheapest round-trip
$58
Overall average: $177
Frontier
Sun 2/15Fri 2/20
DEN - SEA • Non-stop
Cheapest non-stop
$58
Typical prices: $117-$273
Frontier
Sat 2/14Sat 2/21
DEN - SEA • Non-stop
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Flight Deals
Useful Info
Flight 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

Sun, Feb 15 - Fri, Feb 20
Frontier Logo
8:45 am - 10:55 am
DEN
-
SEA
3h 10mnonstop
Frontier Logo
12:00 pm - 3:50 pm
SEA
-
DEN
2h 50mnonstop
$58Frontier
Fri, Jan 30 - Sun, Feb 1
Frontier Logo
9:10 am - 11:19 am
DEN
-
SEA
3h 09mnonstop
Frontier Logo
12:34 pm - 4:25 pm
SEA
-
DEN
2h 51mnonstop
$59Frontier
Sat, Feb 28 - Sun, Mar 1
Multiple Airlines Logo
9:52 am - 12:01 pm
DEN
-
SEA
3h 09mnonstop
Multiple Airlines Logo
8:14 pm - 11:59 pm
SEA
-
DEN
2h 45mnonstop
$85Multiple Airlines
Thu, Feb 5 - Fri, Mar 6
Delta Logo
12:03 pm - 6:29 pm
COS
-
SEA
7h 26m
1 stop
Delta Logo
5:30 am - 11:15 am
SEA
-
COS
4h 45m
1 stop
$137Delta
Fri, Feb 27 - Mon, Mar 2
Southwest Logo
1:30 pm - 8:05 pm
COS
-
SEA
7h 35m
1 stop
Southwest Logo
5:15 am - 11:20 am
SEA
-
COS
5h 05m
1 stop
$151Southwest
Thu, Feb 26 - Mon, Mar 2
Delta Logo
12:00 pm - 6:29 pm
COS
-
SEA
7h 29m
1 stop
Delta Logo
5:30 am - 11:15 am
SEA
-
COS
4h 45m
1 stop
$157Delta
Thu, Feb 12 - Tue, Feb 17
American Airlines Logo
4:49 pm - 12:55 am
COS
-
SEA
9h 06m
1 stop
American Airlines Logo
5:37 am - 4:00 pm
SEA
-
COS
9h 23m
1 stop
$159American Airlines
Wed, Apr 8 - Mon, Apr 13
American Airlines Logo
5:09 pm - 12:44 am
COS
-
SEA
8h 35m
1 stop
American Airlines Logo
11:55 pm - 9:28 am
SEA
-
COS
8h 33m
1 stop
$207American Airlines
Sun, Jan 25 - Sat, Jan 31
Multiple Airlines Logo
1:13 pm - 11:56 am
GJT
-
SEA
23h 43m
1 stop
Multiple Airlines Logo
12:54 pm - 12:33 pm
SEA
-
GJT
22h 39m
1 stop
$272Multiple Airlines
Sat, Feb 7 - Wed, Feb 11
Southwest Logo
9:50 am - 4:50 pm
MTJ
-
SEA
8h 00m
1 stop
Southwest Logo
6:05 am - 12:00 pm
SEA
-
MTJ
4h 55m
1 stop
$301Southwest
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$54
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 16% 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 Delta
DEN
-
SEA
Jun 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 Airlines
DEN
-
SEA
Oct 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.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Westport
Mukilteo
Lacey
Edmonds
Poulsbo
Aberdeen
Woodinville
Shoreline
DuPont
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)