$39+ Cheap flights from Colorado to Washington
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Mar 11 — Mar 181
1 adult, Economy
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Find cheap flights from Colorado to Washington with Cheapflights
1. Tell us where you want to go
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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 9, 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 9, 2026.
This Frontier deal was found by Cheapflights users on 2/8. 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 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Mon 4/206:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/8![Frontier logo]()
$72
This Frontier deal was found by Cheapflights users on 2/5. 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 5/812:51 pm
DEN
- SEA
Nonstop3h 14m
Frontier
Sun 5/106:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/5![Frontier logo]()
$73
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 4/237:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sat 4/256:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/5![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 2/6. 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 3/69:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Fri 3/1312:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/6![Frontier logo]()
$76
This Cheapflightsfares deal was found by Cheapflights users on 2/7. 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 5/112:51 pm
DEN
- SEA
Nonstop3h 14m
Frontier
Sun 5/36:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/7![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 5/37:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Wed 5/66:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/6![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 5/1012:51 pm
DEN
- SEA
Nonstop3h 14m
Frontier
Mon 5/184:20 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/5![Frontier logo]()
$82
This Frontier deal was found by Cheapflights users on 2/5. 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 5/812:51 pm
DEN
- SEA
Nonstop3h 14m
Frontier
Sat 5/166:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/5![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 4/49:25 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sun 4/1212:42 pm
SEA
- DEN
Nonstop2h 55m
Frontier
Deal found 2/7![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 2/6. 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 5/57:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Wed 5/136:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/6![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 2/8. 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 4/237:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Mon 4/276:57 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Deal found 2/8![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 2/7. 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 3/129:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 3/1612:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/7![Frontier logo]()
$88
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 9, 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 9, 2026.
This Frontier deal was found by Cheapflights users on 2/8. 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 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Sun 4/1910:42 am
SEA
- DEN
1 stop6h 07m
Frontier
Deal found 2/8![Frontier logo]()
$118
This Alaska Airlines deal was found by Cheapflights users on 2/5. 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.
Sat 5/91:02 pm
DEN
- SEA
1 stop7h 55m
Alaska Airlines
Sat 5/168:07 pm
SEA
- DEN
Nonstop2h 52m
Alaska Airlines
Deal found 2/5![Alaska Airlines logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 3/239:10 am
DEN
- SEA
Nonstop3h 09m
Multiple Airlines
Wed 3/258:11 pm
SEA
- DEN
Nonstop2h 45m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$137
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/228:00 am
DEN
- PDX
Nonstop2h 48m
United Airlines
Wed 4/294:15 pm
PDX
- DEN
Nonstop2h 39m
United Airlines
Deal found 2/8![United Airlines logo]()
$137
This Delta deal was found by Cheapflights users on 2/6. 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 4/295:37 am
DEN
- PDX
1 stop4h 19m
Delta
Tue 5/55:45 am
PDX
- DEN
1 stop4h 47m
Delta
Deal found 2/6![Delta logo]()
$157
This Southwest deal was found by Cheapflights users on 2/5. 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 3/108:35 am
DEN
- SEA
Nonstop3h 00m
Southwest
Tue 3/172:35 pm
SEA
- DEN
2 stops9h 10m
Southwest
Deal found 2/5![Southwest logo]()
$192
This American Airlines deal was found by Cheapflights users on 2/8. 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 2/184:46 pm
GJT
- SEA
1 stop7h 21m
American Airlines
Sat 2/2112:59 am
SEA
- GJT
1 stop8h 06m
American Airlines
Deal found 2/8![American Airlines logo]()
$245
This Cheapflightsfares deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:10 am
DEN
- PDX
Nonstop2h 59m
Frontier
Thu 3/2612:52 pm
PDX
- DEN
1 stop14h 04m
Frontier
Deal found 2/8![Frontier logo]()
$136
This Alaska Airlines deal was found by Cheapflights users on 2/7. 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 4/156:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Sat 4/182:47 pm
PDX
- DEN
Nonstop2h 41m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$137
This United Airlines deal was found by Cheapflights users on 2/5. 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 4/128:00 am
DEN
- PDX
Nonstop2h 48m
United Airlines
Wed 4/157:05 pm
PDX
- DEN
Nonstop2h 40m
United Airlines
Deal found 2/5![United Airlines logo]()
$147
This Delta deal was found by Cheapflights users on 2/6. 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 3/1012:30 pm
DEN
- PDX
1 stop4h 31m
Delta
Wed 3/115:36 pm
PDX
- DEN
1 stop4h 53m
Delta
Deal found 2/6![Delta logo]()
$157
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/118:00 am
DEN
- PDX
Nonstop2h 48m
United Airlines
Sun 4/125:00 am
PDX
- DEN
Nonstop2h 38m
United Airlines
Deal found 2/8![United Airlines logo]()
$147
This Alaska Airlines deal was found by Cheapflights users on 2/6. 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 3/107:00 am
DEN
- PDX
1 stop4h 46m
Alaska Airlines
Wed 3/113:52 pm
PDX
- DEN
1 stop4h 31m
Alaska Airlines
Deal found 2/6![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 2/6. 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 3/25:30 am
DEN
- PDX
1 stop4h 45m
Delta
Tue 3/31:32 pm
PDX
- DEN
1 stop6h 34m
Delta
Deal found 2/6![Delta logo]()
$167
This Expedia deal was found by Cheapflights users on 2/8. 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 4/169:10 am
DEN
- GEG
Nonstop2h 21m
Multiple Airlines
Tue 4/215:00 am
GEG
- DEN
1 stop4h 51m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$188
This United Airlines deal was found by Cheapflights users on 2/6. 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 4/59:05 pm
DEN
- PDX
Nonstop2h 49m
United Airlines
Thu 4/237:05 pm
PDX
- DEN
Nonstop2h 40m
United Airlines
Deal found 2/6![United Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 2/7. 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 4/186:25 pm
DEN
- PDX
1 stop5h 20m
Delta
Fri 4/246:05 pm
PDX
- DEN
1 stop4h 45m
Delta
Deal found 2/7![Delta logo]()
$167
This Southwest deal was found by Cheapflights users on 2/6. 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 3/238:55 pm
COS
- SEA
1 stop5h 45m
Southwest
Wed 3/254:25 pm
SEA
- COS
1 stop6h 10m
Southwest
Deal found 2/6![Southwest logo]()
$207
This United Airlines deal was found by Cheapflights users on 2/7. 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 4/248:00 am
DEN
- PDX
Nonstop2h 48m
United Airlines
Mon 4/275:00 am
PDX
- DEN
Nonstop2h 38m
United Airlines
Deal found 2/7![United Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 2/7. 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 4/76:30 am
DEN
- SEA
Nonstop3h 08m
Delta
Tue 4/77:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 2/7![Delta logo]()
$177
This Frontier deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:50 am
DEN
- GEG
Nonstop2h 37m
Frontier
Sun 3/112:59 pm
GEG
- DEN
Nonstop2h 21m
Frontier
Deal found 2/8![Frontier logo]()
$220
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/225:57 pm
DEN
- SEA
1 stop6h 30m
United Airlines
Tue 4/285:00 am
SEA
- DEN
Nonstop2h 44m
United Airlines
Deal found 2/8![United Airlines logo]()
$173
This Delta deal was found by Cheapflights users on 2/7. 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 3/76:50 pm
DEN
- SEA
Nonstop3h 18m
Delta
Tue 3/108:30 am
SEA
- DEN
Nonstop2h 55m
Delta
Deal found 2/7![Delta logo]()
$177
This American Airlines deal was found by Cheapflights users on 2/7. 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.
Mon 3/94:46 pm
GJT
- SEA
1 stop9h 09m
American Airlines
Mon 3/1611:59 pm
SEA
- GJT
1 stop9h 00m
American Airlines
Deal found 2/7![American Airlines logo]()
$270
This Delta deal was found by Cheapflights users on 2/7. 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 3/106:30 am
DEN
- SEA
Nonstop3h 06m
Delta
Tue 3/247:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 2/7![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:16 pm
DEN
- PSC
1 stop6h 43m
Alaska Airlines
Tue 3/38:25 am
PSC
- DEN
1 stop7h 55m
Alaska Airlines
Deal found 2/4![Alaska Airlines logo]()
$238
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/97:45 am
DEN
- SEA
Nonstop3h 01m
United Airlines
Sat 4/113:48 pm
SEA
- DEN
Nonstop2h 51m
United Airlines
Deal found 2/8![United Airlines logo]()
$187
This American Airlines deal was found by Cheapflights users on 2/6. 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 2/2511:33 am
ASE
- SEA
1 stop7h 10m
American Airlines
Sun 3/111:57 pm
SEA
- ASE
1 stop9h 14m
American Airlines
Deal found 2/6![American Airlines logo]()
$274
This Alaska Airlines deal was found by Cheapflights users on 2/7. 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 5/56:45 am
DEN
- GEG
2 stops15h 46m
Alaska Airlines
Tue 5/1210:30 am
GEG
- DEN
1 stop12h 29m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$248
This Delta deal was found by Cheapflights users on 2/7. 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 4/86:30 am
DEN
- SEA
Nonstop3h 08m
Delta
Sun 4/127:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 2/7![Delta logo]()
$187
Last-minute flights from Colorado to WashingtonDiscover last-minute flight deals from Colorado to Washington. Data last updated February 9, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Washington. Data last updated February 9, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 2/259:50 pm
DEN
- SEA
1 stop11h 23m
Frontier
Thu 2/261:16 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/5![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 2/278:45 am
DEN
- SEA
Nonstop3h 10m
Frontier
Mon 3/99:36 pm
SEA
- DEN
1 stop10h 25m
Frontier
Deal found 2/6![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 2/7. 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 2/278:45 am
DEN
- SEA
Nonstop3h 10m
Frontier
Sat 2/281:16 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/7![Frontier logo]()
$92
This Orbitz deal was found by Cheapflights users on 2/6. 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.
Fri 2/278:45 am
DEN
- SEA
Nonstop3h 10m
Multiple Airlines
Mon 3/98:14 pm
SEA
- DEN
Nonstop2h 45m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$107
This WAYA deal was found by Cheapflights users on 2/8. 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.
Sat 2/289:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 3/29:14 pm
SEA
- DEN
1 stop5h 42m
Frontier
Deal found 2/8![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 2/7. 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 3/18:45 am
DEN
- SEA
Nonstop3h 10m
Frontier
Tue 3/37:33 pm
SEA
- DEN
1 stop7h 23m
Frontier
Deal found 2/7![Frontier logo]()
$108
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 3/59:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Sun 3/89:35 pm
SEA
- DEN
1 stop29h 21m
Frontier
Deal found 2/8![Frontier logo]()
$109
This Super.com deal was found by Cheapflights users on 2/6. 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 3/69:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Fri 3/1312:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/6![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 3/610:40 pm
DEN
- PDX
1 stop10h 48m
Frontier
Mon 3/912:04 pm
PDX
- DEN
Nonstop2h 37m
Frontier
Deal found 2/6![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 3/1111:38 am
DEN
- PDX
Nonstop3h 00m
Multiple Airlines
Thu 3/1212:04 pm
PDX
- DEN
Nonstop2h 37m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$123
This Super.com deal was found by Cheapflights users on 2/8. 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 3/129:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Sun 3/1512:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/8![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 2/7. 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 3/129:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
Mon 3/1612:24 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 2/7![Frontier logo]()
$88
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 9, 2026.
Search for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated February 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/6. 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
Deal found 2/6![Frontier logo]()
$39
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 3/59:52 am
DEN
- SEA
Nonstop3h 09m
Frontier
Deal found 2/7![Frontier logo]()
$43
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 3/269:10 am
DEN
- GEG
Nonstop2h 37m
Frontier
Deal found 2/7![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 2/6. 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 5/412:51 pm
DEN
- SEA
Nonstop3h 14m
Frontier
Deal found 2/6![Frontier logo]()
$44
This Priceline deal was found by Cheapflights users on 2/7. 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 3/199:10 am
DEN
- GEG
Nonstop2h 37m
Frontier
Deal found 2/7![Frontier logo]()
$44
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 2/208:45 am
DEN
- SEA
Nonstop3h 10m
Frontier
Deal found 2/6![Frontier logo]()
$53
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 3/1110:30 pm
DEN
- SEA
1 stop22h 50m
Frontier
Deal found 2/7![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 5/99:49 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 2/6![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:50 am
DEN
- GEG
Nonstop2h 37m
Frontier
Deal found 2/6![Frontier logo]()
$63
This Frontier deal was found by Cheapflights users on 2/7. 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 3/312:56 pm
DEN
- SEA
1 stop6h 22m
Frontier
Deal found 2/7![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 2/8. 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 3/169:10 am
DEN
- PDX
Nonstop2h 59m
Frontier
Deal found 2/8![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 4/211:35 pm
DEN
- SEA
1 stop29h 07m
Frontier
Deal found 2/6![Frontier logo]()
$66
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 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $72 (Frontier) |
One-way from | $39 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $167 |
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 9, 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
Sat 4/18
7:15 am-9:27 am
Nonstop3h 12m
Seattle/Tacoma Intl
Sun 4/19
10:42 am-5:49 pm
1 stop6h 07m
$118
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 5/9
1:02 pm-7:57 pm
1 stop7h 55m
Seattle/Tacoma Intl
Sat 5/16
8:07 pm-11:59 pm
Nonstop2h 52m
$136
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Sun 3/22
9:10 am-11:09 am
Nonstop2h 59m
Portland
Thu 3/26
12:52 pm-3:56 am
1 stop14h 04m
$136
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Mon 3/23
9:10 am-11:19 am
Nonstop3h 09m
Seattle/Tacoma Intl
Wed 3/25
8:11 pm-11:56 pm
Nonstop2h 45m
$137
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 4/22
8:00 am-9:48 am
Nonstop2h 48m
Portland
Wed 4/29
4:15 pm-7:54 pm
Nonstop2h 39m
$137
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 4/15
6:03 pm-7:52 pm
Nonstop2h 49m
Portland
Sat 4/18
2:47 pm-6:28 pm
Nonstop2h 41m
$137
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Sun 4/12
8:00 am-9:48 am
Nonstop2h 48m
Portland
Wed 4/15
7:05 pm-10:45 pm
Nonstop2h 40m
$147
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Sat 4/11
8:00 am-9:48 am
Nonstop2h 48m
Portland
Sun 4/12
5:00 am-8:38 am
Nonstop2h 38m
$147
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 4/29
5:37 am-8:56 am
1 stop4h 19m
Portland
Tue 5/5
5:45 am-11:32 am
1 stop4h 47m
$157
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Tue 3/10
12:30 pm-4:01 pm
1 stop4h 31m
Portland
Wed 3/11
5:36 pm-11:29 pm
1 stop4h 53m
$157
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-SEA
DEN-PDX
GJT-SEA
DEN-GEG
COS-SEA
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
GJT-SEA
DEN-GEG
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 9, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 39% 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 7, 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.
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 9, 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
Entertainment
7.0
Food
7.1
Crew
8.5
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Food
7.1
Crew
8.5
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Food
7.1
Crew
8.5
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Food
7.1
Crew
8.5
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Food
7.1
Crew
8.5
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Food
7.1
Crew
8.5
Boarding
8.1
Comfort
7.8
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
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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
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Colorado and Washington flights
Browse other Colorado and Washington flight options. Last updated on February 9, 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 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$57 | Average$160 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$97 | Average$339 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$108 | Average$309 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$117 | Average$353 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$117 | Average$429 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$129 | Average$399 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$186 | Average$393 | FlexibilityNo cancel fee | On-time71% |