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$73+ 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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
1 adult, Economy
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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 October 14, 2025.

This Southwest deal was found by Cheapflights users on 10/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2610:35 pmDEN - SEA
Nonstop3h 00mSouthwest
Mon 12/18:35 pmSEA - DEN
Nonstop2h 30mSouthwest
Deal found 10/14$97
This United Airlines deal was found by Cheapflights users on 10/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:55 pmDEN - SEA
1 stop6h 49mUnited Airlines
Mon 11/177:13 pmSEA - DEN
Nonstop2h 42mUnited Airlines
Deal found 10/14$99
This Kiwi.com deal was found by Cheapflights users on 10/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2810:00 amDEN - SEA
Nonstop3h 13mFrontier
Fri 10/319:22 pmSEA - DEN
1 stop12h 59mFrontier
Deal found 10/14$100
This Yatra.com deal was found by Cheapflights users on 10/13. 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 Yatra.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:05 amDEN - SEA
Nonstop3h 08mDelta
Wed 11/195:25 amSEA - DEN
1 stop4h 42mDelta
Deal found 10/13$101
This Frontier deal was found by Cheapflights users on 10/14. 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.
Fri 10/3110:00 amDEN - SEA
Nonstop3h 13mFrontier
Sat 11/112:58 pmSEA - DEN
Nonstop2h 59mFrontier
Deal found 10/14$102
This Southwest deal was found by Cheapflights users on 10/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:35 pmDEN - SEA
Nonstop3h 00mSouthwest
Tue 11/189:25 amSEA - DEN
1 stop7h 35mSouthwest
Deal found 10/14$103
This Orbitz deal was found by Cheapflights users on 10/12. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/610:00 amDEN - SEA
Nonstop3h 13mMultiple Airlines
Sun 11/98:15 pmSEA - DEN
Nonstop2h 44mMultiple Airlines
Deal found 10/12$104
This Kiwi.com deal was found by Cheapflights users on 10/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2910:00 amDEN - SEA
Nonstop3h 13mFrontier
Thu 10/301:18 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 10/14$105
This Kiwi.com deal was found by Cheapflights users on 10/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/205:30 amDEN - SEA
Nonstop3h 03mFrontier
Tue 11/181:37 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 10/14$106
This Delta deal was found by Cheapflights users on 10/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:05 amDEN - SEA
Nonstop3h 08mDelta
Tue 11/181:44 pmSEA - DEN
1 stop4h 17mDelta
Deal found 10/13$107
This Cheapflightsfares deal was found by Cheapflights users on 10/14. 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 11/110:29 pmDEN - SEA
1 stop14h 26mFrontier
Mon 11/31:48 pmSEA - DEN
1 stop19h 23mFrontier
Deal found 10/14$108
This Delta deal was found by Cheapflights users on 10/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:25 pmDEN - SEA
Nonstop3h 05mDelta
Fri 11/77:30 pmSEA - DEN
Nonstop2h 44mDelta
Deal found 10/13$109

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 October 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$100
(Cheapflightsfares)

One-way from

$73
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$187

Good round-trip deal

$205 or less

Good one-way deal

$121 or less
Provider with most accurate pricing for Denver Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Seattle/Tacoma Intl flights.
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From Colorado to Seattle/Tacoma Intl
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One-way flight from Colorado to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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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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 October 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

Mon 1/12

7:50 pm-10:05 pm

Nonstop3h 15m

Seattle/Tacoma Intl

Tue 1/27

7:35 am-11:29 am

Nonstop2h 54m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 12/15

4:00 pm-10:30 pm

1 stop7h 30m

Seattle/Tacoma Intl

Tue 12/30

8:35 pm-12:05 am

Nonstop2h 30m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 11/24

6:20 pm-12:11 am

1 stop6h 51m

Seattle/Tacoma Intl

Tue 12/2

7:35 pm-11:21 pm

Nonstop2h 46m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 1/10

7:55 am-10:10 am

Nonstop3h 15m

Seattle/Tacoma Intl

Sun 1/25

6:35 am-3:45 pm

1 stop8h 10m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 11/7

6:25 am-8:31 am

Nonstop3h 06m

Seattle/Tacoma Intl

Sat 11/15

11:15 am-7:00 pm

1 stop6h 45m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 11/13

6:05 am-8:13 am

Nonstop3h 08m

Seattle/Tacoma Intl

Tue 11/18

5:25 am-11:07 am

1 stop4h 42m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 1/9

6:25 pm-11:16 pm

1 stop5h 51m

Seattle/Tacoma Intl

Sun 1/11

7:40 pm-11:22 pm

Nonstop2h 42m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 12/11

12:05 pm-6:36 pm

1 stop7h 31m

Seattle/Tacoma Intl

Sun 12/14

7:35 pm-11:21 pm

Nonstop2h 46m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 11/7

7:41 pm-9:45 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Sun 11/9

5:25 am-11:07 am

1 stop4h 42m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 11/19

12:02 pm-4:55 pm

1 stop5h 53m

Seattle/Tacoma Intl

Sun 11/23

7:31 am-11:28 am

Nonstop2h 57m

$107

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/13

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, February is the cheapest month in which you can book a flight from Colorado to Seattle (average of $51). Flying from Colorado to Seattle in July is currently the most expensive (average of $118). 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 October 14, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 18% on flights from Colorado to Seattle by exploring options for tickets in the evening.

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 December 16, 2024.

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

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 October 14, 2025.

The most flights from USCO to SEA are scheduled on a Monday (43 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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 175 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 3h 15m. Fly via Delta, Southwest, or American Airlines 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 United Airlines, which is currently one of the cheapest options available, starting at $73. Southwest flights start at $78 while deals on Delta start at $79 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: Sun Country Air (100%), Virgin Atlantic (92%), ANA (85%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $669, our data shows the cheapest flight currently is $70. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $78 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, February is the cheapest month in which you can book a flight from Colorado to Seattle (average of $51). Flying from Colorado to Seattle in July is currently the most expensive (average of $118). 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
Lakewood
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Lacey
Olympia
Kent
Federal Way
Cle Elum
Puyallup
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline

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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 October 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$71Average$167FlexibilityNo cancel feeOn-time62%
DeltaCheapest$110Average$327FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$111Average$255FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$136Average$346FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$153Average$438FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$161Average$369FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$186Average$377FlexibilityNo cancel feeOn-time71%

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