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$25+ 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 12/19. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
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 December 4, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/2. 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.
Fri 12/269:36 amDEN - PAE
Nonstop3h 14mFrontier
Fri 1/212:45 pmPAE - DEN
Nonstop2h 53mFrontier
Deal found 12/2$53
This Frontier deal was found by Cheapflights users on 12/4. 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 12/199:36 amDEN - PAE
Nonstop3h 14mFrontier
Fri 1/212:45 pmPAE - DEN
Nonstop2h 53mFrontier
Deal found 12/4$64
This Cheapflightsfares deal was found by Cheapflights users on 12/2. 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 12/139:42 amDEN - SEA
Nonstop3h 11mFrontier
Wed 12/311:25 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/2$73
This Super.com deal was found by Cheapflights users on 12/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:16 amDEN - SEA
Nonstop3h 14mFrontier
Wed 12/311:25 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/2$78
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/2510:16 amDEN - SEA
Nonstop3h 14mFrontier
Wed 12/311:25 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/2$83
This Frontier deal was found by Cheapflights users on 12/2. 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 12/199:36 amDEN - PAE
Nonstop3h 14mFrontier
Fri 12/2612:45 pmPAE - DEN
Nonstop2h 53mFrontier
Deal found 12/2$100
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/2410:16 amDEN - SEA
Nonstop3h 14mMultiple Airlines
Fri 1/28:17 pmSEA - DEN
Nonstop2h 42mMultiple Airlines
Deal found 12/2$103
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/246:02 amDEN - SEA
Nonstop3h 08mMultiple Airlines
Wed 12/311:25 pmSEA - DEN
Nonstop2h 53mMultiple Airlines
Deal found 12/2$104
This Super.com deal was found by Cheapflights users on 12/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/159:42 amDEN - SEA
Nonstop3h 11mFrontier
Sat 1/32:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/2$107
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 12/259:43 amDEN - PDX
Nonstop3h 00mMultiple Airlines
Tue 1/67:00 amPDX - DEN
Nonstop2h 35mMultiple Airlines
Deal found 12/1$108
This Expedia deal was found by Cheapflights users on 12/1. 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.
Thu 12/259:43 amDEN - PDX
Nonstop3h 00mMultiple Airlines
Wed 12/317:00 amPDX - DEN
Nonstop2h 35mMultiple Airlines
Deal found 12/1$113
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 12/307:20 amDEN - PDX
Nonstop2h 58mMultiple Airlines
Sun 1/412:47 pmPDX - DEN
Nonstop2h 28mMultiple Airlines
Deal found 12/1$114

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 December 4, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$53
(Kiwi.com)

One-way from

$25
(Frontier)

Popular in

June

Cheapest in

January

Average price

$206

Good round-trip deal

$73 or less

Good one-way deal

$29 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. 12% potential increase in price ($31 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 December 2025
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 December 4, 2025.
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

DenverEverett

DEN - PAE

DENPAE

Denver Intl

Fri 1/16

10:42 am-12:52 pm

Nonstop3h 10m

Everett Paine Field

Mon 1/19

1:47 pm-5:31 pm

Nonstop2h 44m

$58

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 2/2

6:50 pm-9:10 pm

Nonstop3h 20m

Seattle/Tacoma Intl

Mon 2/9

7:40 pm-11:25 pm

Nonstop2h 45m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 1/10

7:00 am-9:11 am

Nonstop3h 11m

Seattle/Tacoma Intl

Wed 1/14

7:54 pm-11:35 pm

Nonstop2h 41m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 1/30

12:30 pm-2:43 pm

Nonstop3h 13m

Seattle/Tacoma Intl

Wed 2/4

1:45 pm-5:34 pm

Nonstop2h 49m

$97

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 1/8

11:49 am-6:43 pm

1 stop7h 54m

Seattle/Tacoma Intl

Wed 1/14

7:54 pm-11:35 pm

Nonstop2h 41m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Wed 3/4

6:20 pm-12:09 am

1 stop6h 49m

Seattle/Tacoma Intl

Tue 3/10

7:45 pm-11:30 pm

Nonstop2h 45m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 2/24

6:40 am-8:51 am

Nonstop3h 11m

Seattle/Tacoma Intl

Sat 2/28

5:30 am-12:00 pm

1 stop5h 30m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 1/10

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

Fri 1/23

5:15 am-9:17 am

1 stop5h 02m

Seattle/Tacoma Intl

Tue 1/27

8:25 am-12:27 pm

Nonstop3h 02m

$107

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 1/8

11:49 am-6:43 pm

1 stop7h 54m

Seattle/Tacoma Intl

Mon 1/19

7:54 pm-11:35 pm

Nonstop2h 41m

$112

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

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 December 4, 2025.

It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 50% on the cost of your flight, compared to a flight in the morning.

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 December 16, 2024.

Travelers seeking maximum savings on their Colorado to State of Washington flight should consider departing on Friday evenings when fares are most often at their lowest. Saturday 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 December 4, 2025.

The most flights from USCO to USWA 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 (12 on average).

How much does it cost to fly round-trip from Colorado to State of Washington?

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 December 4, 2025.
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
11,402 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Alaska Airlines
8.0
Very good
11,402 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Southwest
8.0
Very good
4,251 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Delta
7.9
Good
8,010 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
United Airlines
7.4
Good
9,066 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Frontier
5.8
Fair
3,092 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.

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 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 State of Washington?

    For as low as $58, Frontier can have you in State of Washington from Colorado in 3h 10m. There are 1034 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?

    $39 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 $69 and $71, 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.

See more FAQs

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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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$167FlexibilityNo cancel feeOn-time62%
DeltaCheapest$104Average$344FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$111Average$317FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$136Average$352FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$137Average$431FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$153Average$425FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$186Average$373FlexibilityNo cancel feeOn-time71%

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