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$78+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$87
(Cheapflightsfares)

One-way from

$78
(Cheapflightsfares)

Popular in

December

Cheapest in

April

Average price

$178

Good round-trip deal

$217 or less

Good one-way deal

$135 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
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Highest demand for flights based on searches. 8% potential increase in price ($17 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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 5/710:36 pmDEN - SEA
Nonstop3h 08mFrontier
Sun 5/116:00 amSEA - DEN
Nonstop2h 51mFrontier
Deal found 2/20$91
This Travelocity deal was found by Cheapflights users on 2/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2210:37 pmDEN - SEA
Nonstop3h 07mMultiple Airlines
Tue 4/295:30 amSEA - DEN
1 stop4h 51mMultiple Airlines
Deal found 2/20$136
This Delta deal was found by Cheapflights users on 2/20. 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.
Fri 4/187:50 pmDEN - SEA
Nonstop3h 13mDelta
Mon 4/217:55 pmSEA - DEN
Nonstop2h 45mDelta
Deal found 2/20$137
This United Airlines deal was found by Cheapflights users on 2/20. 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 3/135:15 amDEN - SEA
1 stop7h 35mUnited Airlines
Sun 3/165:15 amSEA - DEN
Nonstop2h 42mUnited Airlines
Deal found 2/20$144
This Southwest deal was found by Cheapflights users on 2/20. 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.
Fri 3/1410:50 pmDEN - SEA
Nonstop3h 00mSouthwest
Wed 3/195:15 amSEA - DEN
Nonstop2h 35mSouthwest
Deal found 2/20$177
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/268:20 amDEN - SEA
1 stop4h 12mAlaska Airlines
Sat 5/35:30 amSEA - DEN
1 stop4h 51mAlaska Airlines
Deal found 2/20$216
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Tue 3/185:16 pmCOS - SEA
1 stop4h 45mUnited Airlines
Tue 4/18:50 amSEA - COS
1 stop4h 39mUnited Airlines
Deal found 2/18$217
This American Airlines deal was found by Cheapflights users on 2/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/174:40 pmCOS - SEA
1 stop9h 08mAmerican Airlines
Wed 3/195:22 amSEA - COS
1 stop9h 24mAmerican Airlines
Deal found 2/19$227
This Southwest deal was found by Cheapflights users on 2/19. 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 3/66:15 pmCOS - SEA
1 stop7h 35mSouthwest
Mon 3/105:00 amSEA - COS
1 stop4h 10mSouthwest
Deal found 2/19$257
This Hawaiian Airlines deal was found by Cheapflights users on 2/20. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2811:30 amDEN - SEA
1 stop6h 24mHawaiian Airlines
Sat 9/66:55 pmSEA - DEN
Nonstop2h 44mHawaiian Airlines
Deal found 2/20$272
This American Airlines deal was found by Cheapflights users on 2/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/91:22 pmDEN - SEA
1 stop6h 34mAmerican Airlines
Wed 3/126:35 amSEA - DEN
1 stop7h 53mAmerican Airlines
Deal found 2/20$278
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 4/85:30 amGJT - SEA
1 stop5h 17mUnited Airlines
Thu 4/176:15 amSEA - GJT
2 stops13h 01mUnited Airlines
Deal found 2/20$295

Find flights from Colorado to Seattle within your budget

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 February 20, 2025.

Fly from

Colorado

Fly to

Seattle

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 3/31

9:56 am-12:02 pm

Nonstop3h 06m

Seattle/Tacoma Intl

Mon 4/28

6:00 am-9:46 am

Nonstop2h 46m

$87

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 4/16

7:00 am-9:07 am

Nonstop3h 07m

Seattle/Tacoma Intl

Wed 4/23

6:00 am-9:46 am

Nonstop2h 46m

$133

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 3/13

6:10 am-8:19 am

Nonstop3h 09m

Seattle/Tacoma Intl

Mon 3/17

9:35 am-1:29 pm

Nonstop2h 54m

$137

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 3/13

5:15 am-11:50 am

1 stop7h 35m

Seattle/Tacoma Intl

Sun 3/16

5:15 am-8:57 am

Nonstop2h 42m

$144

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 3/10

4:30 pm-10:55 pm

2 stops7h 25m

Seattle/Tacoma Intl

Thu 3/13

5:00 am-8:40 am

Nonstop2h 40m

$202

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Tue 3/18

5:16 pm-9:01 pm

1 stop4h 45m

Seattle/Tacoma Intl

Tue 4/1

8:50 am-2:29 pm

1 stop4h 39m

$217

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Mon 3/17

4:40 pm-12:48 am

1 stop9h 08m

Seattle/Tacoma Intl

Wed 3/19

5:22 am-3:46 pm

1 stop9h 24m

$227

Colorado SpringsSeattle

COS - SEA

COSSEA

Colorado Springs

Thu 3/6

6:15 pm-12:50 am

1 stop7h 35m

Seattle/Tacoma Intl

Mon 3/10

5:00 am-10:10 am

1 stop4h 10m

$257

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 4/16

2:53 pm-9:55 am

2 stops20h 02m

Seattle/Tacoma Intl

Wed 4/23

3:51 pm-9:15 pm

1 stop4h 24m

$265

Grand JunctionSeattle

GJT - SEA

GJTSEA

Grand Junction Regnl

Tue 4/8

5:30 am-9:47 am

1 stop5h 17m

Seattle/Tacoma Intl

Thu 4/17

6:15 am-8:16 pm

2 stops13h 01m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 50 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.

Travel insights for flights from Colorado to Seattle

Get recent, data-driven insights about flights from Colorado to Seattle including ideal travel times, pricing trends, and more.

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 July is currently the most expensive (average of $411). 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 February 20, 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 February 20, 2025.

The most flights from USCO to SEA are scheduled on a Wednesday (43 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated February 20, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from Colorado to Seattle to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 223 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 $78. Delta flights start at $79 while deals on American Airlines start at $89 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 Durango La Plata County - 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: WestJet (88%), Icelandair (88%), Condor (88%).

  • What are the cheapest flights from Colorado to Seattle?

    While on average a flight from Colorado to Seattle is generally $715, our data shows the cheapest flight currently is $81. When looking at the most popular route, (Denver Intl - Seattle/Tacoma Intl), you can expect to pay $98 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 July is currently the most expensive (average of $411). 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 Colorado?

Book flights to Colorado if you plan to visit one of these locations
SeaTac
Tukwila
Renton
Tacoma
Lacey
Ocean Shores
Leavenworth
Olympia
Federal Way
Centralia
Marysville
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

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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 6 airlines flying from Colorado to Seattle

Discover the top 6 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$132FlexibilityNo cancel feeOn-time62%
DeltaCheapest$92Average$384FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$118Average$348FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$134Average$380FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$139Average$513FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$206Average$429FlexibilityNo cancel feeOn-time71%
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