$65+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
May 11 — May 181
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 11, 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 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/67:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Wed 5/137:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/6![Frontier logo]()
$87
This Frontier deal was found by Cheapflights users on 4/6. 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.
Wed 4/297:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Wed 4/297:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 4/6![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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 5/97:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Sat 5/166:52 pm
SEA
- DEN
Nonstop3h 00m
Frontier
Deal found 4/9![Frontier logo]()
$89
This Cheapflightsfares deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/97:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Thu 6/47:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/10![Frontier logo]()
$93
This Super.com deal was found by Cheapflights users on 4/6. 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.
Mon 5/47:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Tue 5/57:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/6![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 4/6. 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.
Sat 5/97:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Mon 5/117:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/6![Frontier logo]()
$98
This Booking.com deal was found by Cheapflights users on 4/6. 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 Booking.com 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
Mon 5/44:20 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 4/6![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 4/297:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Mon 5/47:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 4/7![Frontier logo]()
$100
This Cheapflightsfares deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/147:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Sun 5/247:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/10![Frontier logo]()
$102
This Expedia deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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.
Mon 6/88:00 am
DEN
- SEA
Nonstop3h 06m
Frontier
Thu 6/117:41 pm
SEA
- DEN
Nonstop2h 55m
Frontier
Deal found 4/9![Frontier logo]()
$103
This Cheapflightsfares deal was found by Cheapflights users on 4/7. 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 5/77:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Sun 5/1012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/7![Frontier logo]()
$122
This Cheapflightsfares deal was found by Cheapflights users on 4/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/610:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Sun 5/1012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/6![Frontier logo]()
$123
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 11, 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 11, 2026.
This Southwest deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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 5/138:55 am
DEN
- PDX
Nonstop2h 40m
Southwest
Sat 5/167:00 am
PDX
- DEN
2 stops6h 40m
Southwest
Deal found 4/9![Southwest logo]()
$192
This Alaska Airlines deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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 6/55:58 pm
DEN
- PDX
Nonstop2h 48m
Alaska Airlines
Sat 6/65:50 pm
PDX
- DEN
Nonstop2h 47m
Alaska Airlines
Deal found 4/9![Alaska Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/191:08 pm
DEN
- SEA
Nonstop3h 02m
Delta
Tue 5/267:59 pm
SEA
- DEN
Nonstop2h 53m
Delta
Deal found 4/10![Delta logo]()
$217
This United Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/237:30 pm
DEN
- PDX
Nonstop2h 45m
United Airlines
Thu 5/286:03 pm
PDX
- DEN
1 stop5h 44m
United Airlines
Deal found 4/10![United Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 4/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/411:30 am
DEN
- PDX
1 stop5h 50m
Southwest
Sat 5/97:00 am
PDX
- DEN
2 stops6h 40m
Southwest
Deal found 4/8![Southwest logo]()
$212
This Delta deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:35 pm
DEN
- SEA
Nonstop3h 02m
Delta
Mon 5/257:55 am
SEA
- DEN
Nonstop2h 59m
Delta
Deal found 4/10![Delta logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 4/6. 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.
Wed 5/1312:02 pm
DEN
- PDX
Nonstop2h 48m
Alaska Airlines
Sat 5/165:50 pm
PDX
- DEN
Nonstop2h 47m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$227
This American Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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.
Sat 5/235:06 pm
DRO
- SEA
1 stop8h 53m
American Airlines
Fri 5/2911:24 pm
SEA
- DRO
1 stop9h 30m
American Airlines
Deal found 4/10![American Airlines logo]()
$462
This Southwest deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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.
Thu 5/76:15 am
COS
- PDX
1 stop5h 30m
Southwest
Sun 5/105:00 am
PDX
- COS
2 stops7h 45m
Southwest
Deal found 4/9![Southwest logo]()
$222
This Delta deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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 5/266:35 pm
DEN
- SEA
Nonstop3h 02m
Delta
Thu 6/47:55 am
SEA
- DEN
Nonstop2h 57m
Delta
Deal found 4/9![Delta logo]()
$227
This United Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 9/169:10 pm
DEN
- PDX
Nonstop2h 42m
United Airlines
Wed 9/233:43 pm
PDX
- DEN
1 stop5h 28m
United Airlines
Deal found 4/10![United Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 4/6. 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.
Wed 4/291:02 pm
DEN
- SEA
1 stop7h 55m
Alaska Airlines
Wed 5/67:05 am
SEA
- DEN
Nonstop2h 49m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 4/6. 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.
Wed 5/68:55 am
DEN
- PDX
Nonstop2h 40m
Southwest
Wed 5/62:35 pm
PDX
- DEN
1 stop5h 05m
Southwest
Deal found 4/6![Southwest logo]()
$227
This Delta deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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 6/25:30 am
DEN
- PDX
1 stop4h 22m
Delta
Wed 6/105:50 pm
PDX
- DEN
1 stop4h 55m
Delta
Deal found 4/9![Delta logo]()
$232
This United Airlines deal was found by Cheapflights users on 4/7. 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.
Thu 4/305:12 pm
COS
- SEA
1 stop6h 47m
United Airlines
Sat 5/25:05 am
SEA
- COS
1 stop5h 00m
United Airlines
Deal found 4/7![United Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 4/6. 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 4/288:00 am
DEN
- SEA
Nonstop3h 07m
Alaska Airlines
Tue 5/52:41 pm
SEA
- DEN
1 stop8h 18m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 4/6. 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 5/48:55 pm
DEN
- PDX
Nonstop2h 45m
Southwest
Wed 5/62:35 pm
PDX
- DEN
1 stop7h 10m
Southwest
Deal found 4/6![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 4/6. 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 5/65:30 am
DEN
- PDX
1 stop4h 26m
Delta
Wed 5/63:35 pm
PDX
- DEN
1 stop7h 15m
Delta
Deal found 4/6![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/234:40 pm
MTJ
- SEA
2 stops9h 33m
United Airlines
Tue 5/265:00 am
SEA
- MTJ
1 stop6h 44m
United Airlines
Deal found 4/10![United Airlines logo]()
$276
This Alaska Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 7/318:00 am
DEN
- PDX
Nonstop2h 46m
Alaska Airlines
Fri 8/76:04 pm
PDX
- DEN
Nonstop2h 36m
Alaska Airlines
Deal found 4/10![Alaska Airlines logo]()
$262
This Southwest deal was found by Cheapflights users on 4/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/299:10 am
COS
- SEA
2 stops8h 45m
Southwest
Sun 5/35:35 am
SEA
- COS
1 stop6h 35m
Southwest
Deal found 4/7![Southwest logo]()
$242
This Delta deal was found by Cheapflights users on 4/6. 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 4/297:45 pm
DEN
- SEA
Nonstop3h 20m
Delta
Sun 5/38:00 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 4/6![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 4/7. 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 6/238:00 am
DEN
- PDX
Nonstop2h 46m
Alaska Airlines
Sat 6/276:04 pm
PDX
- DEN
Nonstop2h 36m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$262
This United Airlines deal was found by Cheapflights users on 4/6. 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.
Fri 5/87:20 pm
DEN
- PSC
Nonstop2h 33m
United Airlines
Sun 5/175:00 am
PSC
- DEN
Nonstop2h 29m
United Airlines
Deal found 4/6![United Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 4/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:35 pm
DEN
- SEA
Nonstop3h 02m
Delta
Mon 6/87:55 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 4/8![Delta logo]()
$247
This Southwest deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/13:20 pm
DEN
- SEA
2 stops8h 45m
Southwest
Sat 5/96:40 am
SEA
- DEN
1 stop5h 10m
Southwest
Deal found 4/10![Southwest logo]()
$248
This United Airlines deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/146:57 pm
COS
- PDX
1 stop4h 57m
United Airlines
Tue 5/195:30 am
PDX
- COS
2 stops7h 54m
United Airlines
Deal found 4/9![United Airlines logo]()
$291
This Alaska Airlines deal was found by Cheapflights users on 4/6. 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.
Sat 5/96:00 am
DEN
- PSC
1 stop7h 44m
Alaska Airlines
Tue 5/121:21 pm
PSC
- DEN
1 stop7h 28m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 4/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/84:25 pm
DEN
- SEA
2 stops7h 40m
Southwest
Sat 5/96:40 am
SEA
- DEN
1 stop5h 10m
Southwest
Deal found 4/7![Southwest logo]()
$248
This United Airlines deal was found by Cheapflights users on 4/7. 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.
Thu 5/77:20 pm
DEN
- PSC
Nonstop2h 33m
United Airlines
Mon 5/115:00 am
PSC
- DEN
Nonstop2h 29m
United Airlines
Deal found 4/7![United Airlines logo]()
$306
Last-minute flights from Colorado to WashingtonDiscover last-minute flight deals from Colorado to Washington. Data last updated April 11, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Washington. Data last updated April 11, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 4/6. 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.
Wed 4/297:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Wed 4/297:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 4/6![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 4/297:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Mon 5/47:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 4/7![Frontier logo]()
$100
This Booking.com deal was found by Cheapflights users on 4/6. 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 Booking.com 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
Mon 5/44:20 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 4/6![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 4/6. 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.
Mon 5/47:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Tue 5/57:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/6![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/67:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Wed 5/137:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/6![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 4/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/610:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Sun 5/1012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/6![Frontier logo]()
$123
This Cheapflightsfares deal was found by Cheapflights users on 4/7. 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 5/77:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Sun 5/1012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/7![Frontier logo]()
$122
This Frontier deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” 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 5/97:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Sat 5/166:52 pm
SEA
- DEN
Nonstop3h 00m
Frontier
Deal found 4/9![Frontier logo]()
$89
This Cheapflightsfares deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/97:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Thu 6/47:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/10![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 4/6. 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.
Sat 5/97:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Mon 5/117:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/6![Frontier logo]()
$98
This Cheapflightsfares deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 5/147:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Sun 5/247:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/10![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Sat 5/167:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Sun 5/317:50 pm
SEA
- DEN
Nonstop3h 04m
Frontier
Deal found 4/8![Frontier logo]()
$106
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 11, 2026.
Search for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated April 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 4/306:00 am
DEN
- SEA
1 stop14h 52m
Frontier
Deal found 4/8![Frontier logo]()
$65
This Super.com deal was found by Cheapflights users on 4/8. 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 4/306:00 am
DEN
- PDX
1 stop6h 50m
Frontier
Deal found 4/8![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/610:39 pm
DEN
- SEA
1 stop20h 56m
Frontier
Deal found 4/6![Frontier logo]()
$70
This Cheapflightsfares deal was found by Cheapflights users on 4/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:00 am
DEN
- PDX
1 stop6h 50m
Frontier
Deal found 4/6![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 4/6. 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.
Wed 5/610:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/6![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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 4/2912:05 pm
DEN
- PDX
1 stop27h 05m
Frontier
Deal found 4/10![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/610:29 pm
DEN
- GEG
1 stop23h 00m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/137:20 am
DEN
- SEA
1 stop12h 15m
Frontier
Deal found 4/6![Frontier logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 4/8. 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.
Wed 7/112:14 pm
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 4/8![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 4/8. 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.
Wed 4/2210:00 am
DEN
- PDX
Nonstop2h 52m
Frontier
Deal found 4/8![Frontier logo]()
$83
This Expedia deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” 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.
Fri 5/157:50 am
DEN
- SEA
Nonstop2h 59m
Frontier
Deal found 4/10![Frontier logo]()
$84
This Priceline deal was found by Cheapflights users on 4/7. 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.
Tue 4/2110:00 am
DEN
- PDX
Nonstop2h 52m
Frontier
Deal found 4/7![Frontier logo]()
$84
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 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $87 (Kiwi.com) |
One-way from | $65 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $205 |
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 11, 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
Wed 5/13
8:55 am-10:35 am
Nonstop2h 40m
Portland
Sat 5/16
7:00 am-2:40 pm
2 stops6h 40m
$192
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Fri 6/5
5:58 pm-7:46 pm
Nonstop2h 48m
Portland
Sat 6/6
5:50 pm-9:37 pm
Nonstop2h 47m
$197
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Mon 5/4
11:30 am-4:20 pm
1 stop5h 50m
Portland
Sat 5/9
7:00 am-2:40 pm
2 stops6h 40m
$212
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 5/19
1:08 pm-3:10 pm
Nonstop3h 02m
Seattle/Tacoma Intl
Tue 5/26
7:59 pm-11:52 pm
Nonstop2h 53m
$217
Colorado SpringsPortland
COS - PDX
COSPDX
Colorado Springs
Thu 5/7
6:15 am-10:45 am
1 stop5h 30m
Portland
Sun 5/10
5:00 am-1:45 pm
2 stops7h 45m
$222
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 5/23
6:35 pm-8:37 pm
Nonstop3h 02m
Seattle/Tacoma Intl
Mon 5/25
7:55 am-11:54 am
Nonstop2h 59m
$227
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 5/13
12:02 pm-1:50 pm
Nonstop2h 48m
Portland
Sat 5/16
5:50 pm-9:37 pm
Nonstop2h 47m
$227
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 5/26
6:35 pm-8:37 pm
Nonstop3h 02m
Seattle/Tacoma Intl
Thu 6/4
7:55 am-11:52 am
Nonstop2h 57m
$227
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Wed 5/6
8:55 am-10:35 am
Nonstop2h 40m
Portland
Wed 5/6
2:35 pm-8:40 pm
1 stop5h 05m
$227
DenverPortland
DEN - PDX
DENPDX
Denver Intl
Tue 6/2
5:30 am-8:52 am
1 stop4h 22m
Portland
Wed 6/10
5:50 pm-11:45 pm
1 stop4h 55m
$232
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
COS-PDX
MTJ-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
COS-SEA
COS-PDX
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 April 11, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 24% 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 11, 2026.
Travelers seeking maximum savings on their Colorado to State of Washington flight should consider departing on Saturday mornings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Colorado to State of Washington
Explore weekly flight availability from Colorado to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 11, 2026.
The most flights from USCO to USWA are scheduled on a Friday (36 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (14 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 11, 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
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
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 11, 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 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$163 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$328 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$107 | Average$267 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$116 | Average$387 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$117 | Average$344 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$127 | Average$400 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$186 | Average$429 | FlexibilityNo cancel fee | On-time71% |