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$28+ Cheap flights from Colorado to Washington

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 2/19. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Colorado to Washington

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

This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Wed 4/226:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/27$65
This Frontier deal was found by Cheapflights users on 1/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Tue 4/286:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/27$66
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/69:25 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Sat 4/186:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/27$69
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/29:00 am
DEN
-
GEG
Nonstop2h 21m
Frontier
Thu 4/911:06 am
GEG
-
DEN
Nonstop2h 14m
Frontier
Deal found 1/27$69
This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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.
Fri 3/69:10 am
DEN
-
SEA
Nonstop3h 09m
Frontier
Fri 3/1312:24 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Deal found 1/27$72
This Frontier deal was found by Cheapflights users on 1/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/59:25 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Wed 4/156:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/27$73
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Sat 5/26:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/27$74
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Thu 4/167:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Tue 4/216:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/29$76
This Frontier deal was found by Cheapflights users on 1/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Thu 4/236:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/27$77
This Frontier deal was found by Cheapflights users on 1/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Sun 5/176:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/28$78
This Frontier deal was found by Cheapflights users on 1/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Sat 5/166:57 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 1/26$79
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/199:50 am
DEN
-
GEG
Nonstop2h 37m
Frontier
Thu 2/2612:22 pm
GEG
-
DEN
Nonstop2h 23m
Frontier
Deal found 1/27$79

Find flight deals from Colorado to Washington

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

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$65
(Kiwi.com)

One-way from

$28
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$177

Good round-trip deal

$119 or less

Good one-way deal

$95 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 Washington
Search Deals
One-way flight from Colorado to Washington
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($35 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 January 2026
Search Deals
Price to beat on a round-trip flight from Colorado to Washington.
Search Deals
Price to beat on a one-way flight from Colorado to Washington.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Washington 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 January 29, 2026.
Use the filters below to find and compare flights from Colorado to Washington that are best for you.

Fly from

Colorado

Fly to

Washington

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 3/12

6:30 am-8:36 am

Nonstop3h 06m

Seattle/Tacoma Intl

Sat 3/14

8:30 am-12:25 pm

Nonstop2h 55m

$137

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 2/24

8:25 pm-10:30 pm

Nonstop3h 05m

Seattle/Tacoma Intl

Tue 3/3

9:55 am-1:40 pm

Nonstop2h 45m

$137

DenverPortland

DEN - PDX

DENPDX

Denver Intl

Tue 2/24

7:48 am-9:42 am

Nonstop2h 54m

Portland

Tue 3/3

5:05 am-8:38 am

Nonstop2h 33m

$137

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 2/27

9:55 pm-12:10 am

Nonstop3h 15m

Seattle/Tacoma Intl

Sun 3/1

5:00 am-8:35 am

Nonstop2h 35m

$137

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 4/3

6:30 am-8:38 am

Nonstop3h 08m

Seattle/Tacoma Intl

Tue 4/7

7:46 pm-11:32 pm

Nonstop2h 46m

$137

DenverPortland

DEN - PDX

DENPDX

Denver Intl

Fri 3/6

11:38 am-1:38 pm

Nonstop3h 00m

Portland

Wed 3/11

7:05 am-10:42 am

Nonstop2h 37m

$147

DenverPortland

DEN - PDX

DENPDX

Denver Intl

Wed 4/1

9:05 pm-10:54 pm

Nonstop2h 49m

Portland

Sun 4/5

7:05 pm-10:45 pm

Nonstop2h 40m

$147

DenverPortland

DEN - PDX

DENPDX

Denver Intl

Tue 2/17

11:38 am-1:38 pm

Nonstop3h 00m

Portland

Mon 2/23

7:05 am-10:42 am

Nonstop2h 37m

$147

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 2/24

1:10 pm-9:50 pm

1 stop9h 40m

Seattle/Tacoma Intl

Sat 3/7

2:45 pm-6:15 pm

Nonstop2h 30m

$153

DenverPortland

DEN - PDX

DENPDX

Denver Intl

Sat 4/4

5:30 am-8:56 am

1 stop4h 26m

Portland

Sat 4/11

5:45 am-11:26 am

1 stop4h 41m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 results
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Best time to book a flight from Colorado to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington 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 Washington

What is the cheapest month to book a flight from Colorado to State of Washington?

Currently, September is the cheapest month in which you can book a flight from Colorado to State of Washington (average of $49). Flying from Colorado to State of Washington in July is currently the most expensive (average of $98). 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 WA?

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

It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 39% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from Colorado to State of Washington?

Use this chart to determine the cheapest time to fly round-trip from Colorado to Washington. Price data was last updated on January 24, 2026.

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

Weekly flight availability from Colorado to State of Washington

Explore weekly flight availability from Colorado to Washington. 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 January 29, 2026.

The most flights from USCO to USWA are scheduled on a Monday (39 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated January 29, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Colorado to Washington to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,808 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Southwest
8.0
Very good
4,267 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,127 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,215 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Frontier
5.7
Fair
3,056 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

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

  • How popular is this Colorado to State of Washington flight route?

    This flight path from Colorado to Washington was viewed by 161 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 State of Washington?

    For as low as $137, Delta can have you in State of Washington from Colorado in 2h 54m. There are 989 mi between Colorado and State of Washington. Generally, flights for this route are nonstop.

  • What are the cheapest airlines to fly from Colorado to State of Washington one-way?

    $29 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Southwest, with prices starting from $68 and $78, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Colorado to Washington 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 State of Washington?

    Currently, September is the cheapest month in which you can book a flight from Colorado to State of Washington (average of $49). Flying from Colorado to State of Washington in July is currently the most expensive (average of $98). 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.

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Alternative routes for Colorado to Washington

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 Washington

Discover the top 7 airlines that operate flights from Colorado to Washington. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$160FlexibilityNo cancel feeOn-time62%
DeltaCheapest$97Average$341FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$108Average$309FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$117Average$351FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$117Average$441FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$129Average$399FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$186Average$398FlexibilityNo cancel feeOn-time71%

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