$33+ 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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Feb 19 — Feb 261
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap 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 20, 2026.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $60 (Kiwi.com) |
One-way from | $33 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $167 |
Good round-trip deal | $58 or less |
Good one-way deal | $114 or less |
Find flight deals from Colorado to Washington
Cheapest flights from Colorado to WashingtonExplore 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 20, 2026.
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 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/39:25 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sun 4/1212:42 pm
SEA
- DEN
Nonstop2h 55m
Frontier
Deal found 1/19![Frontier logo]()
$60
This Cheapflightsfares deal was found by Cheapflights users on 1/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/158:45 am
DEN
- SEA
Nonstop3h 10m
Frontier
Sun 2/2212:00 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 1/18![Frontier logo]()
$77
This Priceline deal was found by Cheapflights users on 1/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/199:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 2/2312:30 pm
SEA
- DEN
Nonstop2h 50m
Frontier
Deal found 1/18![Frontier logo]()
$82
This Frontier deal was found by Cheapflights users on 1/16. 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 1/299:31 am
DEN
- GEG
Nonstop2h 37m
Frontier
Sun 2/112:03 pm
GEG
- DEN
Nonstop2h 23m
Frontier
Deal found 1/16![Frontier logo]()
$84
This Expedia deal was found by Cheapflights users on 1/17. 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.
Sun 2/89:10 am
DEN
- SEA
Nonstop3h 09m
Multiple Airlines
Mon 2/97:54 pm
SEA
- DEN
Nonstop2h 41m
Multiple Airlines
Deal found 1/17![Multiple Airlines logo]()
$87
This Super.com deal was found by Cheapflights users on 1/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/129:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Sat 2/211:51 pm
SEA
- DEN
1 stop6h 09m
Frontier
Deal found 1/18![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 1/16. 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
Sun 2/223:11 pm
GEG
- DEN
Nonstop2h 21m
Frontier
Deal found 1/16![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 1/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Sat 2/281:16 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 1/19![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 1/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:00 am
DEN
- SEA
Nonstop3h 10m
Multiple Airlines
Sun 3/812:24 pm
SEA
- DEN
Nonstop2h 51m
Multiple Airlines
Deal found 1/18![Multiple Airlines logo]()
$97
This Frontier deal was found by Cheapflights users on 1/17. 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 2/199:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Sat 2/211:16 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 1/17![Frontier logo]()
$98
This SmartFares deal was found by Cheapflights users on 1/19. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:00 am
DEN
- SEA
Nonstop3h 10m
Hawaiian Airlines
Sun 2/228:14 pm
SEA
- DEN
Nonstop2h 45m
Hawaiian Airlines
Deal found 1/19![Hawaiian Airlines logo]()
$102
This SmartFares deal was found by Cheapflights users on 1/19. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:00 am
DEN
- SEA
Nonstop3h 10m
Hawaiian Airlines
Thu 3/123:16 pm
SEA
- DEN
Nonstop2h 40m
Hawaiian Airlines
Deal found 1/19![Hawaiian Airlines logo]()
$103
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 20, 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
DenverSpokane
DEN - GEG
DENGEG
Denver Intl
Thu 1/29
9:31 am-11:08 am
Nonstop2h 37m
Spokane
Sun 2/1
12:03 pm-3:26 pm
Nonstop2h 23m
$84
DenverSpokane
DEN - GEG
DENGEG
Denver Intl
Thu 2/19
9:50 am-11:27 am
Nonstop2h 37m
Spokane
Sun 2/22
3:11 pm-6:32 pm
Nonstop2h 21m
$92
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 2/7
7:00 am-9:11 am
Nonstop3h 11m
Seattle/Tacoma Intl
Sun 2/8
7:54 pm-11:35 pm
Nonstop2h 41m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 3/12
8:54 pm-10:59 pm
Nonstop3h 05m
Seattle/Tacoma Intl
Sat 3/14
5:00 am-8:38 am
Nonstop2h 38m
$117
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-11:29 pm
Nonstop2h 44m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 2/14
12:34 pm-2:41 pm
Nonstop3h 07m
Seattle/Tacoma Intl
Sun 2/22
8:30 am-12:14 pm
Nonstop2h 44m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Fri 3/6
11:38 am-4:57 pm
1 stop6h 19m
Seattle/Tacoma Intl
Sun 3/8
8:30 am-12:14 pm
Nonstop2h 44m
$127
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 2/28
3:15 pm-10:10 pm
2 stops7h 55m
Seattle/Tacoma Intl
Thu 3/5
2:35 pm-6:10 pm
Nonstop2h 35m
$132
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Fri 2/6
6:23 pm-12:09 am
1 stop6h 46m
Seattle/Tacoma Intl
Mon 2/9
7:40 pm-11:25 pm
Nonstop2h 45m
$137
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Mon 2/16
7:00 am-12:33 pm
1 stop6h 33m
Seattle/Tacoma Intl
Thu 2/26
8:15 am-12:15 pm
Nonstop3h 00m
$137
Showing 1-10 of 60 results
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 20, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 35% 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 17, 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 20, 2026.
The most flights from USCO to USWA 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 (20 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 20, 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.
Boarding
8.1
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Boarding
8.1
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Boarding
8.1
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Boarding
8.1
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Boarding
8.1
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Boarding
8.1
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
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.
Browse thousands of different options on Cheapflights for your next trip
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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.
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 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$160 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$342 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$108 | Average$309 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$117 | Average$350 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$118 | Average$442 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$132 | Average$408 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$186 | Average$392 | FlexibilityNo cancel fee | On-time71% |