$43+ 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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Mar 21 — Mar 281
1 adult, Economy
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Find cheap flights from Colorado to Washington with Cheapflights
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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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 February 19, 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 February 19, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
Tue 5/56:57 pm
SEA
- DEN
Nonstop2h 52m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$76
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
Mon 5/47:12 pm
SEA
- DEN
Nonstop2h 47m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$81
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
Tue 5/56:57 pm
SEA
- DEN
Nonstop2h 52m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$82
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sun 5/176:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/18![Frontier logo]()
$84
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sun 4/266:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/18![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 2/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Tue 5/510:42 am
SEA
- DEN
1 stop23h 05m
Frontier
Deal found 2/17![Frontier logo]()
$86
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
Mon 5/114:20 pm
SEA
- DEN
Nonstop2h 51m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 2/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1712:51 pm
DEN
- SEA
Nonstop3h 14m
Frontier
Mon 4/204:20 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/17![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 2/17. 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 Kiwi.com 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
Wed 5/1310:42 am
SEA
- DEN
1 stop8h 07m
Frontier
Deal found 2/17![Frontier logo]()
$91
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/267:24 pm
DEN
- SEA
Nonstop3h 09m
Multiple Airlines
Mon 3/3012:24 pm
SEA
- DEN
Nonstop2h 51m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$93
This Orbitz 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 Orbitz 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
Multiple Airlines
Thu 4/98:11 pm
SEA
- DEN
Nonstop2h 45m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$95
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:10 am
DEN
- GEG
Nonstop2h 21m
Frontier
Thu 4/2311:32 am
GEG
- DEN
Nonstop2h 14m
Frontier
Deal found 2/18![Frontier logo]()
$108
Best flights from Colorado to WashingtonDiscover carefully curated flight deals from Colorado to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 19, 2026.
Discover carefully curated flight deals from Colorado to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 19, 2026.
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/171:10 pm
DEN
- SEA
Nonstop3h 11m
Delta
Tue 3/247:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 2/18![Delta logo]()
$97
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/218:55 pm
DEN
- SEA
Nonstop3h 00m
Southwest
Wed 3/252:35 pm
SEA
- DEN
2 stops9h 10m
Southwest
Deal found 2/18![Southwest logo]()
$112
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.
Sun 3/229:05 pm
DEN
- PDX
Nonstop2h 55m
United Airlines
Wed 3/255:05 am
PDX
- DEN
Nonstop2h 33m
United Airlines
Deal found 2/18![United Airlines logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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.
Tue 3/246:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Tue 3/312:30 pm
PDX
- DEN
1 stop8h 14m
Alaska Airlines
Deal found 2/15![Alaska Airlines logo]()
$147
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1412:55 pm
DEN
- SEA
Nonstop3h 00m
Delta
Tue 5/198:00 am
SEA
- DEN
Nonstop3h 00m
Delta
Deal found 2/18![Delta logo]()
$97
This American Airlines deal was found by Cheapflights users on 2/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:18 am
GJT
- SEA
1 stop7h 24m
American Airlines
Sun 3/811:59 pm
SEA
- GJT
1 stop9h 06m
American Airlines
Deal found 2/17![American Airlines logo]()
$211
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/96:05 am
DEN
- SEA
Nonstop3h 04m
Delta
Sun 5/177:59 pm
SEA
- DEN
Nonstop2h 53m
Delta
Deal found 2/18![Delta logo]()
$97
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/248:30 pm
DEN
- SEA
Nonstop3h 00m
Southwest
Wed 3/252:35 pm
SEA
- DEN
2 stops9h 10m
Southwest
Deal found 2/18![Southwest logo]()
$112
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:45 pm
DEN
- SEA
Nonstop3h 20m
Delta
Sun 4/268:00 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 2/18![Delta logo]()
$97
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/197:57 pm
GJT
- SEA
2 stops22h 42m
Multiple Airlines
Mon 3/239:36 pm
SEA
- GJT
1 stop13h 31m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$249
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/286:30 am
DEN
- SEA
Nonstop3h 08m
Delta
Sat 4/117:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 2/18![Delta logo]()
$97
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/186:55 am
DEN
- SEA
Nonstop3h 06m
Delta
Wed 4/228:00 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 2/18![Delta logo]()
$97
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:00 am
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Sun 5/175:50 pm
PDX
- DEN
Nonstop2h 47m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$157
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/267:40 pm
DEN
- SEA
Nonstop3h 12m
Delta
Sat 3/285:30 am
SEA
- DEN
1 stop4h 56m
Delta
Deal found 2/18![Delta logo]()
$107
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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.
Tue 3/246:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Fri 3/272:47 pm
PDX
- DEN
Nonstop2h 41m
Alaska Airlines
Deal found 2/15![Alaska Airlines logo]()
$167
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.
Fri 5/229:10 pm
DEN
- PDX
Nonstop2h 45m
United Airlines
Mon 5/255:00 am
PDX
- DEN
Nonstop2h 31m
United Airlines
Deal found 2/18![United Airlines logo]()
$187
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:27 pm
DEN
- SEA
1 stop6h 32m
Delta
Thu 4/168:00 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 2/18![Delta logo]()
$107
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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.
Tue 3/247:25 am
DEN
- PDX
1 stop7h 12m
Alaska Airlines
Mon 3/302:30 pm
PDX
- DEN
1 stop8h 14m
Alaska Airlines
Deal found 2/15![Alaska Airlines logo]()
$167
This United Airlines deal was found by Cheapflights users on 2/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/286:00 am
COS
- PDX
1 stop4h 47m
United Airlines
Tue 6/25:00 am
PDX
- COS
1 stop7h 14m
United Airlines
Deal found 2/17![United Airlines logo]()
$207
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/114:46 pm
GJT
- SEA
1 stop9h 09m
American Airlines
Tue 3/3111:26 am
SEA
- GJT
1 stop5h 55m
American Airlines
Deal found 2/18![American Airlines logo]()
$245
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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.
Thu 4/96:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Mon 4/137:15 am
PDX
- DEN
1 stop9h 09m
Alaska Airlines
Deal found 2/15![Alaska Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 2/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:50 pm
COS
- PDX
1 stop5h 45m
Southwest
Tue 3/246:00 pm
PDX
- COS
1 stop4h 35m
Southwest
Deal found 2/17![Southwest logo]()
$228
This United Airlines deal was found by Cheapflights users on 2/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/187:14 pm
DEN
- PSC
Nonstop2h 40m
United Airlines
Sun 3/225:05 am
PSC
- DEN
Nonstop2h 30m
United Airlines
Deal found 2/17![United Airlines logo]()
$209
This American Airlines deal was found by Cheapflights users on 2/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/177:00 am
ASE
- SEA
1 stop9h 57m
American Airlines
Tue 3/246:44 am
SEA
- ASE
1 stop8h 22m
American Airlines
Deal found 2/17![American Airlines logo]()
$249
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.
Sat 3/75:30 am
GJT
- SEA
1 stop5h 19m
United Airlines
Mon 3/93:30 pm
SEA
- GJT
1 stop5h 52m
United Airlines
Deal found 2/18![United Airlines logo]()
$211
This American Airlines deal was found by Cheapflights users on 2/15. 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.
Fri 3/132:23 pm
ASE
- SEA
1 stop9h 19m
American Airlines
Mon 3/1611:59 pm
SEA
- ASE
1 stop9h 12m
American Airlines
Deal found 2/15![American Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 2/15. 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.
Tue 3/105:34 am
DEN
- PDX
1 stop4h 30m
Delta
Tue 3/175:45 am
PDX
- DEN
1 stop4h 48m
Delta
Deal found 2/15![Delta logo]()
$157
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.
Fri 3/66:20 pm
GJT
- SEA
1 stop5h 39m
United Airlines
Tue 3/1012:36 pm
SEA
- GJT
2 stops8h 46m
United Airlines
Deal found 2/18![United Airlines logo]()
$216
This Southwest deal was found by Cheapflights users on 2/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/65:10 pm
COS
- PDX
1 stop6h 25m
Southwest
Mon 3/92:50 pm
PDX
- COS
1 stop5h 55m
Southwest
Deal found 2/16![Southwest logo]()
$271
This Delta deal was found by Cheapflights users on 2/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:15 pm
DEN
- PDX
1 stop6h 39m
Delta
Wed 3/255:45 am
PDX
- DEN
1 stop4h 48m
Delta
Deal found 2/17![Delta logo]()
$157
Last-minute flights from Colorado to WashingtonDiscover last-minute flight deals from Colorado to Washington. Data last updated February 19, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Washington. Data last updated February 19, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 2/15. 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 3/59:52 am
DEN
- SEA
Nonstop3h 09m
Multiple Airlines
Sun 3/88:14 pm
SEA
- DEN
Nonstop2h 45m
Multiple Airlines
Deal found 2/15![Multiple Airlines logo]()
$92
This Frontier deal was found by Cheapflights users on 2/15. 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 3/69:10 am
DEN
- PDX
Nonstop2h 59m
Frontier
Sun 3/812:04 pm
PDX
- DEN
Nonstop2h 37m
Frontier
Deal found 2/15![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 2/16. 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 3/129:10 am
DEN
- GEG
Nonstop2h 37m
Frontier
Sun 3/1511:32 am
GEG
- DEN
Nonstop2h 23m
Frontier
Deal found 2/16![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 2/16. 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.
Mon 3/169:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Fri 3/206:54 pm
SEA
- DEN
1 stop13h 31m
Frontier
Deal found 2/16![Frontier logo]()
$98
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/188:30 pm
DEN
- SEA
Nonstop3h 00m
Southwest
Wed 3/252:35 pm
SEA
- DEN
2 stops9h 10m
Southwest
Deal found 2/18![Southwest logo]()
$112
This Frontier deal was found by Cheapflights users on 2/17. 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 3/199:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 3/3012:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/17![Frontier logo]()
$88
This Cheapflightsfares deal was found by Cheapflights users on 2/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/209:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 3/3012:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/17![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 2/15. 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 3/209:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Thu 3/2612:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/15![Frontier logo]()
$104
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:15 pm
DEN
- SEA
1 stop6h 48m
Delta
Tue 3/317:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 2/18![Delta logo]()
$107
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/267:24 pm
DEN
- SEA
Nonstop3h 09m
Multiple Airlines
Mon 3/3012:24 pm
SEA
- DEN
Nonstop2h 51m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 2/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/279:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 3/3012:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/17![Frontier logo]()
$96
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/276:30 am
DEN
- SEA
Nonstop3h 08m
Delta
Tue 3/318:30 am
SEA
- DEN
Nonstop2h 56m
Delta
Deal found 2/18![Delta logo]()
$97
One-way flights from Colorado to WashingtonSearch for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated February 19, 2026.
Search for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated February 19, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/59:50 am
DEN
- GEG
Nonstop2h 37m
Frontier
Deal found 2/17![Frontier logo]()
$43
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/269:10 am
DEN
- GEG
Nonstop2h 37m
Frontier
Deal found 2/19![Frontier logo]()
$44
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/176:55 am
DEN
- SEA
Nonstop3h 06m
Delta
Deal found 2/18![Delta logo]()
$49
This Kiwi.com deal was found by Cheapflights users on 2/16. 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.
Sun 5/177:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Deal found 2/16![Frontier logo]()
$52
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:28 am
DEN
- GEG
Nonstop2h 21m
Frontier
Deal found 2/19![Frontier logo]()
$53
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 4/145:57 pm
DEN
- SEA
1 stop6h 30m
United Airlines
Deal found 2/18![United Airlines logo]()
$54
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:10 am
DEN
- GEG
Nonstop2h 21m
Frontier
Deal found 2/19![Frontier logo]()
$54
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:03 pm
DEN
- PDX
Nonstop2h 49m
Hawaiian Airlines
Deal found 2/18![Hawaiian Airlines logo]()
$56
This Super.com deal was found by Cheapflights users on 2/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 2/17![Frontier logo]()
$58
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/178:30 pm
DEN
- SEA
Nonstop3h 00m
Southwest
Deal found 2/18![Southwest logo]()
$59
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.
Wed 3/189:05 pm
DEN
- PDX
Nonstop2h 55m
United Airlines
Deal found 2/18![United Airlines logo]()
$59
This Frontier deal was found by Cheapflights users on 2/16. 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 3/129:10 am
DEN
- GEG
Nonstop2h 37m
Frontier
Deal found 2/16![Frontier logo]()
$59
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 February 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $76 (Kiwi.com) |
One-way from | $43 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $193 |
Good round-trip deal | $119 or less |
Good one-way deal | $74 or less |
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 February 19, 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
Tue 3/17
1:10 pm-3:21 pm
Nonstop3h 11m
Seattle/Tacoma Intl
Tue 3/24
7:46 pm-11:32 pm
Nonstop2h 46m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 5/14
12:55 pm-2:55 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Tue 5/19
8:00 am-12:00 pm
Nonstop3h 00m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 5/9
6:05 am-8:09 am
Nonstop3h 04m
Seattle/Tacoma Intl
Sun 5/17
7:59 pm-11:52 pm
Nonstop2h 53m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 4/25
7:45 pm-10:05 pm
Nonstop3h 20m
Seattle/Tacoma Intl
Sun 4/26
8:00 pm-11:50 pm
Nonstop2h 50m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 3/28
6:30 am-8:38 am
Nonstop3h 08m
Seattle/Tacoma Intl
Sat 4/11
7:46 pm-11:32 pm
Nonstop2h 46m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 4/18
6:55 am-9:01 am
Nonstop3h 06m
Seattle/Tacoma Intl
Wed 4/22
8:00 pm-11:50 pm
Nonstop2h 50m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 3/26
7:40 pm-9:52 pm
Nonstop3h 12m
Seattle/Tacoma Intl
Sat 3/28
5:30 am-11:26 am
1 stop4h 56m
$107
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Mon 4/13
6:27 pm-11:59 pm
1 stop6h 32m
Seattle/Tacoma Intl
Thu 4/16
8:00 pm-11:50 pm
Nonstop2h 50m
$107
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 3/21
8:55 pm-10:55 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Wed 3/25
2:35 pm-12:45 am
2 stops9h 10m
$112
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 3/24
8:30 pm-10:30 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Wed 3/25
2:35 pm-12:45 am
2 stops9h 10m
$112
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.
DEN-GEG
DEN-SEA
DEN-PDX
GJT-SEA
COS-PDX
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
USCO-USWA
DEN-GEG
DEN-SEA
DEN-PDX
GJT-SEA
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 February 19, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 33% 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 February 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 February 19, 2026.
The most flights from USCO to USWA are scheduled on a Thursday (42 on average). You will have fewer flight options on Tuesday, 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 February 19, 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.
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Comfort
7.8
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Comfort
7.8
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.
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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.
Complete your trip
Complete your trip to Washington by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Colorado to Washington by cabin class
Find flights from Colorado to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Colorado and Washington flights
Browse other Colorado and Washington flight options. Last updated on February 19, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Washington
Find the right flight back to Colorado after your stay in Washington
Colorado to Washington flights
Consider these flights traveling from Colorado to Washington.
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 February 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$57 | Average$160 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$97 | Average$340 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$108 | Average$309 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$117 | Average$352 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$117 | Average$414 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$129 | Average$418 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$186 | Average$385 | FlexibilityNo cancel fee | On-time71% |