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$72+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Colorado to Seattle

Keep the following information in mind while searching for Colorado to Seattle flight deals. Data was last updated August 14, 2025.

Round-trip from

$118
(Frontier)

One-way from

$72
(Gotogate)

Popular in

June

Cheapest in

October

Average price

$209

Good round-trip deal

$166 or less

Good one-way deal

$150 or less
From Colorado to Seattle/Tacoma Intl
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One-way flight from Colorado to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 15% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Colorado to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Colorado to Seattle/Tacoma Intl.
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Find 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 August 14, 2025.

This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/66:33 pmDEN - SEA
Nonstop3h 06mFrontier
Thu 9/1112:05 pmSEA - DEN
1 stop6h 03mFrontier
Deal found 8/14$118
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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.
Wed 9/178:55 pmDEN - SEA
Nonstop3h 04mFrontier
Thu 9/186:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/12$119
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/66:33 pmDEN - SEA
Nonstop3h 06mFrontier
Sun 9/146:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/12$120
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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.
Sat 9/206:33 pmDEN - SEA
Nonstop3h 06mFrontier
Mon 9/226:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/14$121
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/510:29 pmDEN - SEA
Nonstop3h 01mFrontier
Sun 10/128:43 pmSEA - DEN
Nonstop2h 52mFrontier
Deal found 8/12$122
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1910:29 pmDEN - SEA
Nonstop3h 01mFrontier
Sat 9/207:00 amSEA - DEN
Nonstop2h 53mFrontier
Deal found 8/12$123
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/306:45 pmDEN - SEA
Nonstop3h 06mFrontier
Thu 9/46:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/14$124
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:29 pmDEN - SEA
Nonstop3h 01mFrontier
Mon 10/132:31 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 8/12$125
This Justfly.com deal was found by Cheapflights users on 8/14. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/410:29 pmDEN - SEA
Nonstop3h 01mFrontier
Mon 9/86:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/14$126
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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.
Fri 9/1210:29 pmDEN - SEA
Nonstop3h 01mFrontier
Mon 9/156:12 amSEA - DEN
Nonstop2h 56mFrontier
Deal found 8/12$127
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/17:30 amDEN - SEA
Nonstop3h 04mFrontier
Wed 9/36:41 amSEA - DEN
Nonstop2h 49mFrontier
Deal found 8/14$128
This CheapOair deal was found by Cheapflights users on 8/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/38:55 pmDEN - SEA
Nonstop3h 06mFrontier
Mon 9/84:36 pmSEA - DEN
1 stop16h 48mFrontier
Deal found 8/13$129

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 August 14, 2025.
Use the filters below to find and compare flights from Colorado to Seattle that are best for you.

Fly from

Colorado

Fly to

Seattle

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 9/9

8:55 pm-10:59 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Mon 9/15

12:30 pm-7:31 pm

1 stop6h 01m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/6

6:33 pm-8:39 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Thu 9/11

12:05 pm-7:08 pm

1 stop6h 03m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 9/28

6:00 am-11:11 am

1 stop6h 11m

Seattle/Tacoma Intl

Sun 10/5

6:12 am-10:08 am

Nonstop2h 56m

$119

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/20

6:33 pm-8:39 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 9/22

6:12 am-10:08 am

Nonstop2h 56m

$120

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 9/28

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Sat 10/4

7:00 am-10:53 am

Nonstop2h 53m

$121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 9/8

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Sat 9/13

7:00 am-10:53 am

Nonstop2h 53m

$121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 9/10

8:55 pm-10:59 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Mon 9/15

6:12 am-10:08 am

Nonstop2h 56m

$121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/27

6:33 pm-8:39 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Sun 10/5

6:12 am-10:08 am

Nonstop2h 56m

$121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 9/27

6:33 pm-8:39 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Fri 10/3

6:12 am-10:08 am

Nonstop2h 56m

$121

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Tue 10/28

12:09 pm-7:27 pm

1 stop8h 18m

Seattle/Tacoma Intl

Mon 11/10

12:59 am-11:45 am

1 stop9h 46m

$175

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 60 results
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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 $238). Flying from Colorado to Seattle in June is currently the most expensive (average of $389). 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 August 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Seattle as you normally would.

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 August 14, 2025.

The most flights from USCO to SEA are scheduled on a Thursday (59 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (20 on average).

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 198 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • 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 $72. Delta flights start at $88 while deals on United Airlines start at $121 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: Virgin Atlantic (84%), Singapore Airlines (81%), KLM (81%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $507, our data shows the cheapest flight currently is $85. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $117 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 $238). Flying from Colorado to Seattle in June is currently the most expensive (average of $389). 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
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

Browse thousands of different options on Cheapflights for your next trip

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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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$60Average$160FlexibilityNo cancel feeOn-time62%
DeltaCheapest$109Average$330FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$109Average$258FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$137Average$371FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$148Average$465FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$158Average$374FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$199Average$398FlexibilityNo cancel feeOn-time71%

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