$92+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Aug 16 — Aug 231
Round-trip
1 adult, Economy
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Find cheap flights from Colorado to Washington with Cheapflights
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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 July 17, 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 July 17, 2026.
This WAYA deal was found by Cheapflights users on 7/17. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:10 am
DEN
- SEA
1 stop5h 54m
Frontier
Tue 8/252:37 pm
SEA
- DEN
Nonstop2h 56m
Frontier
Deal found 7/17![Frontier logo]()
$162
This Frontier deal was found by Cheapflights users on 7/16. 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.
Sat 8/2911:05 am
DEN
- SEA
Nonstop3h 17m
Frontier
Wed 9/27:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/16![Frontier logo]()
$164
This Cheapflightsfares deal was found by Cheapflights users on 7/17. 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.
Mon 8/2410:10 am
DEN
- SEA
Nonstop3h 10m
Frontier
Thu 8/277:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/17![Frontier logo]()
$166
This Frontier deal was found by Cheapflights users on 7/16. 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.
Mon 8/106:10 am
DEN
- SEA
1 stop5h 54m
Frontier
Thu 9/107:41 pm
SEA
- DEN
Nonstop2h 53m
Frontier
Deal found 7/16![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 7/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/47:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Tue 8/117:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/16![Frontier logo]()
$168
This Frontier deal was found by Cheapflights users on 7/13. 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 8/188:45 am
DEN
- SEA
1 stop11h 53m
Frontier
Sat 8/292:37 pm
SEA
- DEN
Nonstop2h 56m
Frontier
Deal found 7/13![Frontier logo]()
$169
This CheapOair deal was found by Cheapflights users on 7/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/257:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Wed 7/297:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/14![Frontier logo]()
$170
This Super.com deal was found by Cheapflights users on 7/13. 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 8/87:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Mon 8/107:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/13![Frontier logo]()
$171
This Super.com deal was found by Cheapflights users on 7/13. 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.
Fri 8/217:15 am
DEN
- SEA
Nonstop3h 04m
Frontier
Mon 8/241:35 pm
SEA
- DEN
Nonstop2h 59m
Frontier
Deal found 7/13![Frontier logo]()
$172
This Cheapflightsfares deal was found by Cheapflights users on 7/14. 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 7/287:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Tue 8/48:13 pm
SEA
- DEN
1 stop6h 37m
Frontier
Deal found 7/14![Frontier logo]()
$173
This Frontier deal was found by Cheapflights users on 7/16. 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.
Sun 8/97:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Mon 8/249:29 pm
SEA
- DEN
1 stop5h 19m
Frontier
Deal found 7/16![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 7/16. 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 8/303:28 pm
DEN
- PDX
Nonstop2h 43m
Multiple Airlines
Fri 9/45:58 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Deal found 7/16![Multiple Airlines logo]()
$202
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 July 17, 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 July 17, 2026.
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2910:25 am
DEN
- PDX
2 stops8h 15m
Southwest
Tue 9/14:00 pm
PDX
- DEN
Nonstop2h 30m
Southwest
Deal found 7/15![Southwest logo]()
$232
This Delta deal was found by Cheapflights users on 7/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:00 pm
DEN
- PDX
1 stop4h 05m
Delta
Sun 9/135:49 pm
PDX
- DEN
1 stop4h 58m
Delta
Deal found 7/16![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 7/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
DEN
- SEA
1 stop6h 44m
Alaska Airlines
Wed 9/911:32 am
SEA
- DEN
1 stop8h 41m
Alaska Airlines
Deal found 7/16![Alaska Airlines logo]()
$257
This United Airlines deal was found by Cheapflights users on 7/14. 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 8/177:14 pm
DEN
- SEA
Nonstop3h 01m
United Airlines
Thu 8/203:54 pm
SEA
- DEN
Nonstop2h 51m
United Airlines
Deal found 7/14![United Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:05 pm
DEN
- SEA
Nonstop3h 00m
Southwest
Wed 8/1911:10 am
SEA
- DEN
Nonstop2h 40m
Southwest
Deal found 7/15![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 7/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1912:54 pm
DEN
- PDX
1 stop4h 09m
Delta
Sun 8/235:45 am
PDX
- DEN
1 stop5h 19m
Delta
Deal found 7/16![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 7/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:43 pm
DEN
- SEA
1 stop7h 09m
Alaska Airlines
Wed 9/210:18 am
SEA
- DEN
1 stop8h 08m
Alaska Airlines
Deal found 7/16![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 7/16. 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.
Sat 8/157:35 pm
DEN
- SEA
Nonstop2h 55m
Southwest
Wed 8/1911:10 am
SEA
- DEN
Nonstop2h 40m
Southwest
Deal found 7/16![Southwest logo]()
$237
This United Airlines deal was found by Cheapflights users on 7/12. 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 9/1111:30 am
DEN
- PDX
Nonstop2h 44m
United Airlines
Mon 9/145:00 am
PDX
- DEN
Nonstop2h 39m
United Airlines
Deal found 7/12![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 7/15. 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.
Thu 8/206:20 am
DEN
- PDX
1 stop6h 25m
Delta
Sun 8/235:30 am
PDX
- DEN
1 stop5h 56m
Delta
Deal found 7/15![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 7/12. 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 11/117:50 am
DEN
- PAE
1 stop4h 37m
Alaska Airlines
Tue 11/1712:54 pm
PAE
- DEN
1 stop7h 34m
Alaska Airlines
Deal found 7/12![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 7/16. 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 10/97:00 pm
DEN
- PDX
Nonstop2h 45m
Southwest
Wed 10/146:00 am
PDX
- DEN
2 stops7h 00m
Southwest
Deal found 7/16![Southwest logo]()
$242
This Southwest deal was found by Cheapflights users on 7/16. 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.
Tue 8/182:40 pm
DEN
- SEA
2 stops7h 35m
Southwest
Tue 8/256:10 pm
SEA
- DEN
Nonstop2h 45m
Southwest
Deal found 7/16![Southwest logo]()
$252
This United Airlines deal was found by Cheapflights users on 7/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2910:27 am
COS
- SEA
2 stops11h 16m
United Airlines
Wed 9/212:15 pm
SEA
- COS
2 stops10h 40m
United Airlines
Deal found 7/16![United Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 7/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/211:43 pm
DEN
- SEA
1 stop8h 57m
Alaska Airlines
Sat 8/2911:41 am
SEA
- DEN
1 stop8h 32m
Alaska Airlines
Deal found 7/16![Alaska Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 7/14. 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 8/136:28 pm
DEN
- PDX
1 stop6h 11m
Delta
Tue 8/183:25 pm
PDX
- DEN
1 stop7h 33m
Delta
Deal found 7/14![Delta logo]()
$287
This Southwest deal was found by Cheapflights users on 7/16. 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.
Tue 9/2212:50 pm
DEN
- SEA
2 stops8h 25m
Southwest
Tue 9/296:10 pm
SEA
- DEN
Nonstop2h 45m
Southwest
Deal found 7/16![Southwest logo]()
$252
This United Airlines deal was found by Cheapflights users on 7/13. 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 10/15:30 am
COS
- PDX
1 stop4h 57m
United Airlines
Tue 10/610:43 am
PDX
- COS
1 stop6h 12m
United Airlines
Deal found 7/13![United Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 7/12. 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 9/176:17 am
DEN
- PDX
1 stop8h 31m
Alaska Airlines
Fri 9/253:03 pm
PDX
- DEN
1 stop7h 41m
Alaska Airlines
Deal found 7/12![Alaska Airlines logo]()
$297
This Delta deal was found by Cheapflights users on 7/12. 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 9/166:14 pm
COS
- PDX
1 stop5h 17m
Delta
Wed 9/235:10 pm
PDX
- COS
1 stop4h 14m
Delta
Deal found 7/12![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 7/14. 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 8/115:20 pm
COS
- SEA
1 stop7h 05m
Southwest
Sat 8/2910:50 am
SEA
- COS
1 stop5h 20m
Southwest
Deal found 7/14![Southwest logo]()
$257
This United Airlines deal was found by Cheapflights users on 7/13. 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 10/16:00 pm
DRO
- SEA
1 stop5h 59m
United Airlines
Tue 10/65:00 am
SEA
- DRO
1 stop4h 51m
United Airlines
Deal found 7/13![United Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:35 am
COS
- SEA
1 stop7h 40m
Southwest
Sat 9/125:30 am
SEA
- COS
1 stop5h 40m
Southwest
Deal found 7/15![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 7/15. 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 8/46:16 pm
COS
- SEA
1 stop4h 49m
Delta
Wed 8/1212:36 pm
SEA
- COS
2 stops8h 52m
Delta
Deal found 7/15![Delta logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 7/12. 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 9/161:43 pm
DEN
- PAE
1 stop9h 46m
Alaska Airlines
Sun 9/2712:21 pm
PAE
- DEN
1 stop5h 11m
Alaska Airlines
Deal found 7/12![Alaska Airlines logo]()
$316
This United Airlines deal was found by Cheapflights users on 7/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:30 am
GJT
- PDX
1 stop5h 02m
United Airlines
Sun 8/305:00 am
PDX
- GJT
1 stop6h 38m
United Airlines
Deal found 7/16![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 7/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:53 pm
GJT
- SEA
1 stop6h 06m
Delta
Mon 8/317:16 am
SEA
- GJT
2 stops10h 02m
Delta
Deal found 7/16![Delta logo]()
$314
This Alaska Airlines deal was found by Cheapflights users on 7/14. 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 8/118:00 am
DEN
- PAE
1 stop4h 53m
Alaska Airlines
Wed 8/1212:33 pm
PAE
- DEN
1 stop4h 36m
Alaska Airlines
Deal found 7/14![Alaska Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 7/12. 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 10/312:30 pm
DEN
- SEA
2 stops10h 05m
Southwest
Wed 10/77:30 am
SEA
- DEN
1 stop6h 45m
Southwest
Deal found 7/12![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 7/12. 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 10/177:00 am
GJT
- PDX
1 stop7h 15m
United Airlines
Sat 10/248:40 am
PDX
- GJT
1 stop4h 57m
United Airlines
Deal found 7/12![United Airlines logo]()
$329
Last-minute flights from Colorado to WashingtonDiscover last-minute flight deals from Colorado to Washington. Data last updated July 17, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Washington. Data last updated July 17, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 7/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Fri 7/317:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/15![Frontier logo]()
$168
This Super.com deal was found by Cheapflights users on 7/14. 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 7/227:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Wed 7/227:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/14![Frontier logo]()
$197
This Super.com deal was found by Cheapflights users on 7/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Fri 8/211:35 pm
SEA
- DEN
Nonstop2h 59m
Frontier
Deal found 7/16![Frontier logo]()
$187
This Super.com deal was found by Cheapflights users on 7/15. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Sat 7/257:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/15![Frontier logo]()
$198
This Booking.com deal was found by Cheapflights users on 7/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Sun 8/237:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/15![Frontier logo]()
$201
This CheapOair deal was found by Cheapflights users on 7/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/257:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Wed 7/297:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/14![Frontier logo]()
$170
This Cheapflightsfares deal was found by Cheapflights users on 7/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/259:13 am
DEN
- SEA
Nonstop3h 07m
Frontier
Tue 8/47:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/15![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Sun 7/267:13 am
DEN
- SEA
Nonstop3h 04m
Frontier
Wed 8/57:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 7/17![Frontier logo]()
$200
This Cheapflightsfares deal was found by Cheapflights users on 7/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/33:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Fri 8/712:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Deal found 7/16![Frontier logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:03 pm
DEN
- PDX
2 stops24h 05m
Multiple Airlines
Tue 8/185:56 pm
PDX
- DEN
Nonstop2h 43m
Multiple Airlines
Deal found 7/15![Multiple Airlines logo]()
$204
This Frontier deal was found by Cheapflights users on 7/16. 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.
Sat 8/297:00 am
DEN
- PDX
1 stop5h 35m
Frontier
Mon 8/3112:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Deal found 7/16![Frontier logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 7/16. 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 8/303:28 pm
DEN
- PDX
Nonstop2h 43m
Multiple Airlines
Sun 9/62:51 pm
PDX
- DEN
Nonstop2h 41m
Multiple Airlines
Deal found 7/16![Multiple Airlines logo]()
$202
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 July 17, 2026.
Search for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated July 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 9/98:30 am
DEN
- GEG
1 stop25h 49m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 9/127:08 pm
DEN
- GEG
1 stop15h 11m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:24 pm
DEN
- GEG
1 stop20h 55m
Multiple Airlines
Deal found 7/15![Multiple Airlines logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Wed 8/2612:47 pm
DEN
- SEA
1 stop22h 52m
Frontier
Deal found 7/17![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 7/16. 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.
Wed 11/47:08 pm
DEN
- SEA
1 stop23h 37m
Frontier
Deal found 7/16![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Wed 11/187:08 pm
DEN
- SEA
1 stop23h 37m
Frontier
Deal found 7/17![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Mon 8/248:31 pm
DEN
- SEA
2 stops15h 08m
Frontier
Deal found 7/17![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 8/1210:29 pm
DEN
- GEG
1 stop22h 55m
Multiple Airlines
Deal found 7/13![Multiple Airlines logo]()
$106
This Cheapflightsfares deal was found by Cheapflights users on 7/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:45 am
DEN
- SEA
Nonstop3h 06m
Frontier
Deal found 7/16![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3110:49 pm
DEN
- SEA
2 stops20h 02m
Frontier
Deal found 7/15![Frontier logo]()
$108
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Mon 11/210:30 pm
DEN
- SEA
2 stops20h 56m
Frontier
Deal found 7/17![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 9/1510:54 pm
DEN
- GEG
2 stops35h 25m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$110
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 July 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $162 (WAYA) |
One-way from | $92 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $308 |
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 July 17, 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
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Sat 8/29
10:25 am-5:40 pm
2 stops8h 15m
Portland
Tue 9/1
4:00 pm-7:30 pm
Nonstop2h 30m
$232
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 8/12
9:05 pm-11:05 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Wed 8/19
11:10 am-2:50 pm
Nonstop2h 40m
$237
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 8/15
7:35 pm-9:30 pm
Nonstop2h 55m
Seattle/Tacoma Intl
Wed 8/19
11:10 am-2:50 pm
Nonstop2h 40m
$237
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Fri 10/9
7:00 pm-8:45 pm
Nonstop2h 45m
Portland
Wed 10/14
6:00 am-2:00 pm
2 stops7h 00m
$242
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 9/9
1:00 pm-4:05 pm
1 stop4h 05m
Portland
Sun 9/13
5:49 pm-11:47 pm
1 stop4h 58m
$247
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 8/19
12:54 pm-4:03 pm
1 stop4h 09m
Portland
Sun 8/23
5:45 am-12:04 pm
1 stop5h 19m
$247
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 8/18
2:40 pm-9:15 pm
2 stops7h 35m
Seattle/Tacoma Intl
Tue 8/25
6:10 pm-9:55 pm
Nonstop2h 45m
$252
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 9/22
12:50 pm-8:15 pm
2 stops8h 25m
Seattle/Tacoma Intl
Tue 9/29
6:10 pm-9:55 pm
Nonstop2h 45m
$252
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 8/11
6:00 am-11:44 am
1 stop6h 44m
Seattle/Tacoma Intl
Wed 9/9
11:32 am-9:13 pm
1 stop8h 41m
$257
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 9/1
1:43 pm-7:52 pm
1 stop7h 09m
Seattle/Tacoma Intl
Wed 9/2
10:18 am-7:26 pm
1 stop8h 08m
$257
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
DEN-PAE
COS-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-SEA
DEN-PDX
DEN-PAE
COS-SEA
What is the cheapest month to book a flight from Colorado to State of Washington?
Currently, November is the cheapest month in which you can book a flight from Colorado to State of Washington (average of $209). Flying from Colorado to State of Washington in January is currently the most expensive (average of $394). 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 July 17, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight at noon.
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 July 17, 2026.
The most flights from USCO to USWA are scheduled on a Friday (55 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 on average).
How much does it cost to fly round-trip from Colorado to State of Washington?
How far ahead should I book a flight from Colorado to State of Washington?
The best time to book flights from Colorado to State of Washington is 46 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 July 11, 2026.
Travelers seeking maximum savings on their Colorado to State of Washington flight should consider departing on Sunday 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.
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 July 17, 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.
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
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 July 17, 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 July 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$175 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$87 | Average$325 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$96 | Average$215 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$117 | Average$416 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$117 | Average$384 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$124 | Average$430 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$200 | Average$432 | FlexibilityNo cancel fee | On-time71% |