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$96+ Cheap flights from Colorado to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
1 adult, Economy
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Cheap flight deals from Colorado to Seattle

Cheapest flights from Colorado to Seattle
Explore the most affordable flight options available from Colorado to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/11:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Tue 10/64:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/29$146
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Mon 8/249:29 pm
SEA
-
DEN
1 stop10h 36m
Frontier
Deal found 7/29$147
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Sat 8/2910:34 am
SEA
-
DEN
1 stop13h 10m
Frontier
Deal found 7/25$148
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Mon 8/2410:34 am
SEA
-
DEN
1 stop13h 10m
Frontier
Deal found 7/24$149
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Mon 8/249:29 pm
SEA
-
DEN
1 stop10h 36m
Frontier
Deal found 7/26$150
This Cheapflightsfares deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/11:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Sat 10/107:41 pm
SEA
-
DEN
Nonstop2h 53m
Frontier
Deal found 7/29$151
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Sun 9/208:15 pm
SEA
-
DEN
1 stop12h 17m
Frontier
Deal found 7/28$152
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/119:05 am
DEN
-
SEA
1 stop10h 31m
Frontier
Wed 9/164:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/24$153
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Tue 9/17:07 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 7/24$154
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Tue 9/154:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/24$155
This Cheapflightsfares deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:15 am
DEN
-
SEA
Nonstop3h 04m
Frontier
Fri 9/114:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/27$156
This Cheapflightsfares deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/101:07 pm
DEN
-
SEA
Nonstop3h 01m
Frontier
Mon 9/144:27 pm
SEA
-
DEN
Nonstop2h 54m
Frontier
Deal found 7/29$157

Find flight deals from Colorado to Seattle

Keep the following information in mind while searching for Colorado to Seattle flight deals. Data was last updated July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$146
(Cheapflightsfares)

One-way from

$96
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$324

Good round-trip deal

$212 or less

Good one-way deal

$145 or less
Provider with most accurate pricing for Denver Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Seattle/Tacoma Intl flights.
Search Deals
From Colorado to Seattle/Tacoma Intl
Search Deals
One-way flight from Colorado to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Colorado to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Colorado to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
Use the filters below to find and compare flights from Colorado to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 8/26

6:20 am-8:19 am

Nonstop2h 59m

Seattle/Tacoma Intl

Sun 8/30

8:07 pm-11:58 pm

Nonstop2h 51m

$197

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 8/22

6:43 pm-8:45 pm

Nonstop3h 02m

Seattle/Tacoma Intl

Mon 8/24

8:07 pm-11:58 pm

Nonstop2h 51m

$197

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 8/24

3:45 pm-5:42 pm

Nonstop2h 57m

Seattle/Tacoma Intl

Thu 8/27

3:30 pm-10:08 pm

1 stop5h 38m

$207

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 8/25

3:50 pm-11:25 pm

1 stop8h 35m

Seattle/Tacoma Intl

Sat 8/29

5:30 am-2:25 pm

2 stops7h 55m

$222

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 8/19

2:50 pm-9:45 pm

1 stop7h 55m

Seattle/Tacoma Intl

Sat 8/22

5:30 am-2:25 pm

2 stops7h 55m

$232

HaydenSeattle

HDN - SEA

HDNSEA

Hayden Yampa Valley

Wed 9/30

1:43 pm-11:26 pm

2 stops10h 43m

Seattle/Tacoma Intl

Sat 10/3

5:00 am-12:41 pm

1 stop6h 41m

$252

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 8/24

7:05 pm-12:40 am

1 stop6h 35m

Seattle/Tacoma Intl

Sat 10/10

11:40 am-10:35 pm

2 stops9h 55m

$252

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 8/23

7:35 am-2:00 pm

2 stops7h 25m

Seattle/Tacoma Intl

Thu 8/27

3:40 pm-11:00 pm

1 stop6h 20m

$267

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Fri 9/11

4:20 pm-11:00 pm

1 stop7h 40m

Seattle/Tacoma Intl

Sat 9/19

11:25 am-8:10 pm

1 stop7h 45m

$267

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 9/9

4:30 pm-11:40 pm

1 stop8h 10m

Seattle/Tacoma Intl

Wed 9/16

5:55 am-2:10 pm

2 stops7h 15m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Colorado to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Colorado with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Colorado to Seattle

What is the cheapest month to book a flight from Colorado to Seattle?

Currently, January is the cheapest month in which you can book a flight from Colorado to Seattle (average of $170). Flying from Colorado to Seattle in July is currently the most expensive (average of $331). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CO to SEA?

Find hourly flight availability from Colorado to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2026.

Unlike in the morning, when flights are generally more expensive, you can save up to 45% on flights from Colorado to Seattle by exploring options for tickets in the evening.

Weekly flight availability from Colorado to Seattle

Explore weekly flight availability from Colorado to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 29, 2026.

The most flights from USCO to SEA are scheduled on a Monday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

How much does it cost to fly round-trip from Colorado to Seattle?

Airfare is below average for this route at the moment.
Colorado to Seattle flights typically cost between $172 and $330 in October.
The cheapest round-trip price found within the last 5 days was $146 on Frontier (Oct 1-Oct 6).

How far ahead should I book a flight from Colorado to Seattle?

The price you pay for your flight from Colorado to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 46 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest day to fly from Colorado to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Colorado to Seattle. Price data was last updated on July 25, 2026.

Travelers seeking maximum savings on their Colorado to Seattle flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Colorado?

    Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Colorado to Seattle. It is only a 11.4 mi journey from Seattle/Tacoma Intl (SEA) to Seattle’s city center.

  • How popular is this Colorado to Seattle flight route?

    This flight path from Colorado to Seattle/Tacoma Intl was viewed by 109 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Colorado to Seattle?

    There are many flights that can get you from Colorado to Seattle in 2h 57m. Fly via Delta, United Airlines, or Southwest to get the fastest option. The distance from Colorado to Seattle is about 1022 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Colorado to Seattle one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $29. Southwest flights start at $58 while deals on Delta start at $68 one-way.

  • What are the most popular routes from Colorado to Seattle?

    Most travelers choose Denver Intl - Seattle/Tacoma Intl, Grand Junction Regnl - Seattle/Tacoma Intl or Colorado Springs - Seattle/Tacoma Intl when deciding on the best route from Colorado to Seattle.

  • What are the most reliable airlines from Colorado to Seattle?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Colorado to Seattle on time: Korean Air (97%), Scandinavian Airlines (94%), Air France (89%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $1,948, our data shows the cheapest flight currently is $79. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $88 for that flight.

  • Can I find deals for flights from Colorado to Seattle that include hotel bookings?

    Yes. In addition to deals on Colorado to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Seattle.

  • Can I find deals for business class flights from Colorado to Seattle?

    Yes. Cheapflights offers flight deals from Colorado to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Colorado to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Colorado to Seattle (average of $170). Flying from Colorado to Seattle in July is currently the most expensive (average of $331). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Edmonds
Tukwila
Snoqualmie
Tumwater
Centralia
Puyallup
Kent
Ellensburg
Fife
Marysville
Ocean Shores
Lakewood
Lynnwood
Shoreline

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Colorado to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Colorado to Seattle

Discover the top 7 airlines that operate flights from Colorado to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$194FlexibilityNo cancel feeOn-time62%
DeltaCheapest$86Average$298FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$88Average$222FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$117Average$371FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$117Average$419FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$126Average$417FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$244Average$456FlexibilityNo cancel feeOn-time71%

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