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$47+ 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 2/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This Priceline deal was found by Cheapflights users on 12/9. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:35 amDEN - SEA
1 stop8h 19mFrontier
Tue 1/61:00 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/9$111
This deal was found by Cheapflights users on 12/10. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/129:42 amDEN - SEA
Nonstop3h 11mFrontier
Sat 12/207:28 pmSEA - DEN
1 stop7h 30mFrontier
Deal found 12/10$117
This Cheapflightsfares deal was found by Cheapflights users on 12/9. 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.
Mon 12/227:00 amDEN - SEA
1 stop28h 11mFrontier
Sat 1/32:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/9$125
This Cheapflightsfares deal was found by Cheapflights users on 12/8. 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 12/306:35 amDEN - SEA
1 stop8h 19mFrontier
Sat 1/32:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/8$134
This Frontier deal was found by Cheapflights users on 12/11. 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 12/2510:16 amDEN - SEA
Nonstop3h 14mFrontier
Mon 1/52:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/11$138
This Priceline deal was found by Cheapflights users on 12/9. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/226:35 amDEN - SEA
1 stop8h 19mFrontier
Thu 1/812:26 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 12/9$141
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/139:42 amDEN - SEA
Nonstop3h 11mFrontier
Thu 1/812:26 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 12/11$142
This Frontier deal was found by Cheapflights users on 12/11. 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 12/2910:16 amDEN - SEA
Nonstop3h 14mFrontier
Mon 1/52:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/11$148
This Frontier deal was found by Cheapflights users on 12/11. 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 12/2510:16 amDEN - SEA
Nonstop3h 14mFrontier
Thu 1/11:25 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/11$152
This Frontier deal was found by Cheapflights users on 12/11. 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 12/2610:16 amDEN - SEA
Nonstop3h 14mFrontier
Mon 1/52:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/11$153
This Expedia deal was found by Cheapflights users on 12/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/226:35 amDEN - SEA
1 stop8h 19mFrontier
Thu 1/11:25 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/11$155
This Delta deal was found by Cheapflights users on 12/11. 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.
Sun 12/215:59 pmCOS - SEA
1 stop7h 21mDelta
Thu 1/155:25 amSEA - COS
1 stop4h 52mDelta
Deal found 12/11$282

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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$57
(Kiwi.com)

One-way from

$47
(Trip.com)

Popular in

July

Cheapest in

January

Average price

$206

Good round-trip deal

$169 or less

Good one-way deal

$113 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.
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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. 10% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
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 December 12, 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

Sun 1/11

6:29 am-8:40 am

Nonstop3h 11m

Seattle/Tacoma Intl

Mon 1/12

7:40 pm-11:25 pm

Nonstop2h 45m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 1/23

7:00 am-9:11 am

Nonstop3h 11m

Seattle/Tacoma Intl

Mon 1/26

8:55 am-12:38 pm

Nonstop2h 43m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 1/8

4:20 pm-6:26 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Tue 1/13

8:40 am-12:32 pm

Nonstop2h 52m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 3/6

6:50 pm-9:08 pm

Nonstop3h 18m

Seattle/Tacoma Intl

Sun 3/8

7:45 pm-11:30 pm

Nonstop2h 45m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 2/24

6:20 pm-12:09 am

1 stop6h 49m

Seattle/Tacoma Intl

Sat 2/28

8:15 am-12:15 pm

Nonstop3h 00m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 1/30

6:23 pm-12:09 am

1 stop6h 46m

Seattle/Tacoma Intl

Wed 2/4

8:25 am-12:27 pm

Nonstop3h 02m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 1/12

6:29 am-8:40 am

Nonstop3h 11m

Seattle/Tacoma Intl

Wed 1/14

1:38 pm-7:56 pm

1 stop5h 18m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 1/10

6:50 pm-9:10 pm

Nonstop3h 20m

Seattle/Tacoma Intl

Sun 1/18

5:25 am-11:54 am

1 stop5h 29m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 1/12

6:23 pm-11:22 pm

1 stop5h 59m

Seattle/Tacoma Intl

Tue 1/13

8:25 am-12:27 pm

Nonstop3h 02m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 2/6

6:23 pm-12:09 am

1 stop6h 46m

Seattle/Tacoma Intl

Sat 2/14

7:40 pm-11:25 pm

Nonstop2h 45m

$107

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 $49). 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 December 12, 2025.

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.

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 Tuesday afternoons 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 December 12, 2025.

The most flights from USCO to SEA are scheduled on a Thursday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 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 165 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 06m. Fly via Delta, Alaska Airlines, or United Airlines to get the fastest option. The distance from Colorado to Seattle is about 1022 mi. Most flights are nonstop.

  • 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 $44. Delta flights start at $69 while deals on Southwest start at $70 one-way.

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

    Most travelers choose Denver Intl - Seattle/Tacoma Intl, Colorado Springs - Seattle/Tacoma Intl or Grand Junction Regnl - 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: Japan Airlines (92%), Qatar Airways (90%), ANA (90%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $769, our data shows the cheapest flight currently is $51. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $76 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 $49). 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
Tacoma
SeaTac
Lakewood
Olympia
Ocean Shores
Edmonds
Lynnwood
Renton
Puyallup
Kirkland
Tukwila
Kent
Cle Elum
Marysville
Leavenworth
Fife
Aberdeen
Shoreline
Centralia
Federal Way

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$166FlexibilityNo cancel feeOn-time62%
DeltaCheapest$111Average$326FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$111Average$255FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$135Average$432FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$137Average$310FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$151Average$352FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$186Average$381FlexibilityNo cancel feeOn-time71%

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