$68+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
May 23 — May 301
Round-trip
1 adult, Economy
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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 April 23, 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 April 23, 2026.
This Frontier deal was found by Cheapflights users on 4/19. 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.
Mon 5/117:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Tue 5/197:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/19![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 4/18. 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.
Tue 5/127:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Fri 5/297:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/18![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 4/18. 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.
Mon 5/117:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Fri 5/293:19 pm
SEA
- DEN
Nonstop2h 59m
Frontier
Deal found 4/18![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/127:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Sun 5/177:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/20![Frontier logo]()
$105
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/288:00 am
DEN
- SEA
Nonstop3h 06m
Frontier
Thu 6/47:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/20![Frontier logo]()
$106
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/117:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Thu 5/147:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/20![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 4/19. 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.
Sun 5/107:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Mon 5/117:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/19![Frontier logo]()
$108
This Travelocity deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:00 am
DEN
- SEA
Nonstop3h 05m
Multiple Airlines
Fri 5/157:50 pm
SEA
- DEN
Nonstop3h 04m
Multiple Airlines
Deal found 4/22![Multiple Airlines logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 7/112:14 pm
DEN
- SEA
Nonstop3h 04m
Frontier
Thu 7/237:41 pm
SEA
- DEN
Nonstop2h 55m
Frontier
Deal found 4/22![Frontier logo]()
$110
This Cheapflightsfares deal was found by Cheapflights users on 4/21. 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.
Tue 5/57:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Tue 5/127:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/21![Frontier logo]()
$111
This Frontier deal was found by Cheapflights users on 4/22. 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.
Wed 5/67:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Wed 5/137:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/22![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 4/19. 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.
Tue 5/127:20 am
DEN
- SEA
1 stop12h 15m
Frontier
Wed 5/277:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/19![Frontier logo]()
$113
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 April 23, 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 April 23, 2026.
This Southwest deal was found by Cheapflights users on 4/22. 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.
Mon 6/87:55 pm
COS
- SEA
1 stop5h 55m
Southwest
Wed 6/104:35 pm
SEA
- COS
1 stop6h 10m
Southwest
Deal found 4/22![Southwest logo]()
$163
This Delta deal was found by Cheapflights users on 4/21. 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 6/247:00 pm
DEN
- SEA
1 stop5h 59m
Delta
Thu 7/27:55 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 4/21![Delta logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 4/23. 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 5/268:00 am
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Wed 6/35:50 pm
PDX
- DEN
Nonstop2h 47m
Alaska Airlines
Deal found 4/23![Alaska Airlines logo]()
$176
This United Airlines deal was found by Cheapflights users on 4/18. 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 9/95:30 am
COS
- SEA
1 stop5h 33m
United Airlines
Wed 9/166:00 pm
SEA
- COS
1 stop4h 49m
United Airlines
Deal found 4/18![United Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 4/22. 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 6/247:00 pm
DEN
- SEA
1 stop5h 59m
Delta
Mon 6/297:55 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 4/22![Delta logo]()
$167
This Delta deal was found by Cheapflights users on 4/21. 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 6/266:30 am
DEN
- SEA
Nonstop3h 01m
Delta
Wed 7/17:15 am
SEA
- DEN
1 stop6h 45m
Delta
Deal found 4/21![Delta logo]()
$167
This Delta deal was found by Cheapflights users on 4/21. 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 6/36:19 pm
DEN
- SEA
1 stop6h 51m
Delta
Thu 6/47:15 am
SEA
- DEN
1 stop6h 43m
Delta
Deal found 4/21![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 4/18. 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.
Tue 5/196:00 am
DEN
- SEA
Nonstop3h 05m
Alaska Airlines
Tue 5/268:07 pm
SEA
- DEN
Nonstop2h 52m
Alaska Airlines
Deal found 4/18![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 4/22. 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 8/206:00 am
DEN
- PDX
1 stop5h 12m
United Airlines
Mon 8/244:07 pm
PDX
- DEN
Nonstop2h 38m
United Airlines
Deal found 4/22![United Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 4/22. 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 8/193:30 pm
DEN
- PDX
2 stops7h 25m
Southwest
Mon 8/245:15 pm
PDX
- DEN
1 stop4h 50m
Southwest
Deal found 4/22![Southwest logo]()
$236
This Alaska Airlines deal was found by Cheapflights users on 4/18. 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.
Wed 5/206:00 am
DEN
- SEA
Nonstop3h 05m
Alaska Airlines
Mon 5/257:30 am
SEA
- DEN
Nonstop2h 54m
Alaska Airlines
Deal found 4/18![Alaska Airlines logo]()
$227
This United Airlines deal was found by Cheapflights users on 4/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:10 pm
DEN
- PDX
Nonstop2h 42m
United Airlines
Mon 9/75:00 am
PDX
- DEN
Nonstop2h 39m
United Airlines
Deal found 4/19![United Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 4/22. 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 6/86:20 pm
COS
- SEA
1 stop6h 39m
Delta
Wed 6/1012:35 pm
SEA
- COS
2 stops9h 05m
Delta
Deal found 4/22![Delta logo]()
$208
This Alaska Airlines deal was found by Cheapflights users on 4/18. 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.
Sun 5/246:00 am
DEN
- SEA
Nonstop3h 05m
Alaska Airlines
Thu 5/288:07 pm
SEA
- DEN
Nonstop2h 52m
Alaska Airlines
Deal found 4/18![Alaska Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 4/21. 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 5/158:10 pm
DEN
- SEA
1 stop5h 45m
Southwest
Sun 5/173:25 pm
SEA
- DEN
1 stop7h 30m
Southwest
Deal found 4/21![Southwest logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 4/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/177:05 pm
DEN
- PDX
Nonstop2h 45m
Alaska Airlines
Wed 7/226:04 pm
PDX
- DEN
Nonstop2h 36m
Alaska Airlines
Deal found 4/19![Alaska Airlines logo]()
$247
This United Airlines deal was found by Cheapflights users on 4/21. 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 5/127:50 am
DEN
- PDX
Nonstop2h 48m
United Airlines
Fri 5/157:05 pm
PDX
- DEN
Nonstop2h 39m
United Airlines
Deal found 4/21![United Airlines logo]()
$278
This Southwest deal was found by Cheapflights users on 4/22. 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 5/208:15 pm
DEN
- GEG
Nonstop2h 20m
Southwest
Wed 5/276:30 am
GEG
- DEN
Nonstop2h 15m
Southwest
Deal found 4/22![Southwest logo]()
$299
This Delta deal was found by Cheapflights users on 4/22. 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 8/316:45 am
DEN
- PDX
1 stop4h 51m
Delta
Thu 9/35:45 pm
PDX
- DEN
1 stop4h 45m
Delta
Deal found 4/22![Delta logo]()
$255
This Alaska Airlines deal was found by Cheapflights users on 4/18. 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.
Sun 5/246:00 am
DEN
- SEA
Nonstop3h 05m
Alaska Airlines
Sun 5/2410:30 am
SEA
- DEN
1 stop6h 55m
Alaska Airlines
Deal found 4/18![Alaska Airlines logo]()
$256
This United Airlines deal was found by Cheapflights users on 4/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/97:24 pm
DEN
- PSC
Nonstop2h 28m
United Airlines
Sun 7/125:14 am
PSC
- DEN
Nonstop2h 22m
United Airlines
Deal found 4/19![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 4/21. 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.
Sun 7/126:00 am
COS
- SEA
1 stop12h 40m
Southwest
Thu 7/161:30 pm
SEA
- COS
2 stops8h 10m
Southwest
Deal found 4/21![Southwest logo]()
$308
This United Airlines deal was found by Cheapflights users on 4/23. 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 5/86:04 pm
GJT
- SEA
1 stop5h 55m
United Airlines
Tue 5/125:02 am
SEA
- GJT
1 stop4h 41m
United Airlines
Deal found 4/23![United Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 4/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:40 am
DEN
- PDX
1 stop3h 56m
Delta
Fri 8/145:45 pm
PDX
- DEN
1 stop4h 45m
Delta
Deal found 4/19![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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 5/121:02 pm
DEN
- SEA
2 stops10h 16m
Alaska Airlines
Sat 5/168:07 pm
SEA
- DEN
Nonstop2h 52m
Alaska Airlines
Deal found 4/22![Alaska Airlines logo]()
$268
This Southwest deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/127:55 pm
COS
- PDX
1 stop5h 35m
Southwest
Tue 6/165:55 pm
PDX
- COS
1 stop4h 50m
Southwest
Deal found 4/20![Southwest logo]()
$312
This United Airlines deal was found by Cheapflights users on 4/21. 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.
Mon 6/16:00 am
DEN
- PDX
1 stop5h 20m
United Airlines
Wed 6/36:03 pm
PDX
- DEN
1 stop5h 44m
United Airlines
Deal found 4/21![United Airlines logo]()
$293
This Delta deal was found by Cheapflights users on 4/18. 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.
Sun 7/195:40 am
DEN
- PDX
1 stop3h 57m
Delta
Sat 7/255:54 pm
PDX
- DEN
1 stop4h 48m
Delta
Deal found 4/18![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/34:45 pm
COS
- SEA
2 stops8h 10m
Southwest
Wed 6/108:50 am
SEA
- COS
1 stop9h 25m
Southwest
Deal found 4/19![Southwest logo]()
$316
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/245:40 am
DEN
- PDX
1 stop3h 57m
Delta
Thu 6/255:50 pm
PDX
- DEN
1 stop4h 55m
Delta
Deal found 4/20![Delta logo]()
$267
Last-minute flights from Colorado to WashingtonDiscover last-minute flight deals from Colorado to Washington. Data last updated April 23, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Washington. Data last updated April 23, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 4/297:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Wed 5/137:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/22![Frontier logo]()
$146
This Cheapflightsfares deal was found by Cheapflights users on 4/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sat 5/96:52 pm
SEA
- DEN
Nonstop3h 00m
Frontier
Deal found 4/19![Frontier logo]()
$127
This Cheapflightsfares deal was found by Cheapflights users on 4/21. 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.
Thu 5/147:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Mon 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/21![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/23. 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 5/168:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Tue 5/265:46 pm
PDX
- DEN
Nonstop2h 52m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$132
This Frontier deal was found by Cheapflights users on 4/23. 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 5/1610:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Mon 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/23![Frontier logo]()
$142
This Frontier deal was found by Cheapflights users on 4/23. 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 5/177:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Tue 5/265:46 pm
PDX
- DEN
Nonstop2h 52m
Frontier
Deal found 4/23![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 4/23. 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 5/198:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Fri 5/2912:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$135
This Cheapflightsfares deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Sat 5/3012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/21![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:29 pm
DEN
- PDX
1 stop12h 51m
Frontier
Mon 5/2512:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/20![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 5/278:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Tue 6/25:46 pm
PDX
- DEN
Nonstop2h 52m
Multiple Airlines
Deal found 4/21![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 5/278:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Sun 5/3112:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Deal found 4/21![Multiple Airlines logo]()
$141
This Cheapflightsfares deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/307:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Mon 6/112:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/20![Frontier logo]()
$143
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 April 23, 2026.
Search for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated April 23, 2026.
This Super.com deal was found by Cheapflights users on 4/19. 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.
Wed 4/297:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Deal found 4/19![Frontier logo]()
$68
This Super.com deal was found by Cheapflights users on 4/21. 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 7/27:45 am
DEN
- SEA
Nonstop3h 03m
Frontier
Deal found 4/21![Frontier logo]()
$72
This Cheapflightsfares deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/278:00 am
DEN
- SEA
Nonstop3h 06m
Frontier
Deal found 4/22![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2710:12 am
DEN
- GEG
Nonstop2h 26m
Frontier
Deal found 4/20![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 4/21. 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.
Tue 6/912:14 pm
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 4/21![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 4/19. 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.
Sat 5/2310:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/19![Frontier logo]()
$75
This Delta deal was found by Cheapflights users on 4/22. 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 9/25:55 pm
COS
- SEA
1 stop7h 06m
Delta
Deal found 4/22![Delta logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 6/810:29 pm
DEN
- SEA
1 stop13h 06m
Frontier
Deal found 4/21![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 5/1310:29 pm
DEN
- PDX
1 stop23h 22m
Frontier
Deal found 4/21![Frontier logo]()
$78
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:30 am
DEN
- SEA
Nonstop3h 01m
Delta
Deal found 4/20![Delta logo]()
$79
This KAYAK deal was found by Cheapflights users on 4/18. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/83:00 pm
DEN
- PDX
Nonstop2h 46m
Frontier
Deal found 4/18![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/167:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Deal found 4/20![Frontier logo]()
$80
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 April 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $98 (Frontier) |
One-way from | $68 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $217 |
Good round-trip deal | $119 or less |
Good one-way deal | $114 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 April 23, 2026.
Use the filters below to find and compare flights from Colorado to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Colorado SpringsSeattle
COS - SEA
COSSEA
Colorado Springs
Mon 6/8
7:55 pm-12:50 am
1 stop5h 55m
Seattle/Tacoma Intl
Wed 6/10
4:35 pm-11:45 pm
1 stop6h 10m
$163
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 6/24
7:00 pm-11:59 pm
1 stop5h 59m
Seattle/Tacoma Intl
Thu 7/2
7:55 pm-11:45 pm
Nonstop2h 50m
$167
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 6/24
7:00 pm-11:59 pm
1 stop5h 59m
Seattle/Tacoma Intl
Mon 6/29
7:55 pm-11:45 pm
Nonstop2h 50m
$167
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Fri 6/26
6:30 am-8:31 am
Nonstop3h 01m
Seattle/Tacoma Intl
Wed 7/1
7:15 am-3:00 pm
1 stop6h 45m
$167
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Tue 5/26
8:00 am-9:49 am
Nonstop2h 49m
Portland
Wed 6/3
5:50 pm-9:37 pm
Nonstop2h 47m
$176
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 6/3
6:19 pm-12:10 am
1 stop6h 51m
Seattle/Tacoma Intl
Thu 6/4
7:15 am-2:58 pm
1 stop6h 43m
$177
Colorado SpringsSeattle
COS - SEA
COSSEA
Colorado Springs
Mon 6/8
6:20 pm-11:59 pm
1 stop6h 39m
Seattle/Tacoma Intl
Wed 6/10
12:35 pm-10:40 pm
2 stops9h 05m
$208
Colorado SpringsSeattle
COS - SEA
COSSEA
Colorado Springs
Wed 9/9
5:30 am-10:03 am
1 stop5h 33m
Seattle/Tacoma Intl
Wed 9/16
6:00 pm-11:49 pm
1 stop4h 49m
$217
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 5/19
6:00 am-8:05 am
Nonstop3h 05m
Seattle/Tacoma Intl
Tue 5/26
8:07 pm-11:59 pm
Nonstop2h 52m
$217
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Thu 8/20
6:00 am-10:12 am
1 stop5h 12m
Portland
Mon 8/24
4:07 pm-7:45 pm
Nonstop2h 38m
$227
Showing 1-10 of 60 resultsSorted by cheapest first
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-SEA
DEN-PDX
COS-SEA
DEN-GEG
DEN-PSC
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-SEA
DEN-PDX
COS-SEA
DEN-GEG
What is the cheapest month to book a flight from Colorado to State of Washington?
Currently, August is the cheapest month in which you can book a flight from Colorado to State of Washington (average of $194). Flying from Colorado to State of Washington in January is currently the most expensive (average of $453). 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 April 23, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight at noon.
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 April 18, 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. Sunday 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 April 23, 2026.
The most flights from USCO to USWA are scheduled on a Wednesday (35 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 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 April 23, 2026.
Peruse reviews from past customers who have flown with Southwest,Alaska Airlines, andDelta 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.
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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 April 23, 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 April 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$162 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$324 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$107 | Average$268 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$116 | Average$390 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$117 | Average$345 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$125 | Average$385 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$200 | Average$466 | FlexibilityNo cancel fee | On-time71% |