$49+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
avr. 5 — avr. 121
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 mars 6, 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 mars 6, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/5. 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.
ven. 4/177:40 am
DEN
- SEA
Nonstop3h 12m
Frontier
sam. 4/257:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/5![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
lun. 4/207:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/3![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
ven. 4/177:40 am
DEN
- SEA
Nonstop3h 12m
Frontier
mar. 4/217:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/2![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
jeu. 3/269:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
ven. 4/1012:42 pm
SEA
- DEN
Nonstop2h 55m
Frontier
Deal found 3/2![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 4/256:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
mer. 4/297:12 pm
SEA
- DEN
Nonstop2h 47m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
jeu. 4/236:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
ven. 4/247:12 pm
SEA
- DEN
Nonstop2h 47m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mer. 4/226:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
mar. 4/287:12 pm
SEA
- DEN
Nonstop2h 47m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
jeu. 4/237:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/4![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 3/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/157:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
sam. 4/187:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/4![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 3/5. 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.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
mer. 4/227:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/5![Frontier logo]()
$92
This Trip.com deal was found by Cheapflights users on 3/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 4/29:25 am
DEN
- SEA
Nonstop3h 12m
Multiple Airlines
lun. 4/68:11 pm
SEA
- DEN
Nonstop2h 45m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 5/96:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
sam. 5/166:57 pm
SEA
- DEN
Nonstop2h 52m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$94
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 mars 6, 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 mars 6, 2026.
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
jeu. 4/238:35 pm
DEN
- SEA
Nonstop2h 58m
United Airlines
lun. 4/275:00 am
SEA
- DEN
Nonstop2h 44m
United Airlines
Deal found 3/1![United Airlines logo]()
$97
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
jeu. 4/236:00 am
DEN
- SEA
Nonstop3h 03m
Alaska Airlines
dim. 4/268:05 pm
SEA
- DEN
Nonstop2h 54m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$97
This Southwest deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
mer. 5/135:05 pm
DEN
- SEA
1 stop7h 50m
Southwest
lun. 5/185:30 am
SEA
- DEN
Nonstop2h 35m
Southwest
Deal found 3/3![Southwest logo]()
$107
This Delta deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 5/96:19 pm
DEN
- SEA
1 stop4h 44m
Delta
dim. 5/177:59 pm
SEA
- DEN
Nonstop2h 53m
Delta
Deal found 3/3![Delta logo]()
$137
This Delta deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
mar. 3/316:15 pm
DEN
- SEA
1 stop6h 48m
Delta
mar. 4/77:46 pm
SEA
- DEN
Nonstop2h 46m
Delta
Deal found 3/3![Delta logo]()
$137
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/151:45 pm
DEN
- SEA
2 stops10h 10m
Southwest
sam. 4/185:10 am
SEA
- DEN
2 stops8h 10m
Southwest
Deal found 3/4![Southwest logo]()
$147
This Delta deal was found by Cheapflights users on 3/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/86:15 pm
DEN
- SEA
1 stop6h 48m
Delta
lun. 4/138:00 pm
SEA
- DEN
Nonstop2h 50m
Delta
Deal found 3/4![Delta logo]()
$137
This United Airlines deal was found by Cheapflights users on 3/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/89:05 pm
DEN
- PDX
Nonstop2h 49m
United Airlines
sam. 4/114:15 pm
PDX
- DEN
Nonstop2h 40m
United Airlines
Deal found 3/4![United Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
jeu. 4/233:50 pm
DEN
- SEA
1 stop7h 45m
Southwest
lun. 4/275:30 am
SEA
- DEN
Nonstop2h 35m
Southwest
Deal found 3/1![Southwest logo]()
$147
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mer. 4/88:15 am
COS
- SEA
1 stop7h 39m
Delta
mar. 4/145:35 am
SEA
- COS
1 stop4h 37m
Delta
Deal found 3/1![Delta logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 3/5. 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.
mer. 4/221:02 pm
DEN
- SEA
1 stop9h 43m
Alaska Airlines
lun. 4/272:41 pm
SEA
- DEN
1 stop8h 18m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$177
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
ven. 5/17:20 pm
COS
- SEA
1 stop6h 35m
Southwest
lun. 5/45:35 pm
SEA
- COS
1 stop5h 15m
Southwest
Deal found 3/1![Southwest logo]()
$151
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/146:50 pm
COS
- SEA
1 stop6h 05m
Southwest
mar. 4/2111:35 am
SEA
- COS
2 stops8h 45m
Southwest
Deal found 3/4![Southwest logo]()
$162
This United Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
jeu. 4/29:05 pm
DEN
- PDX
Nonstop2h 49m
United Airlines
jeu. 4/94:15 pm
PDX
- DEN
Nonstop2h 39m
United Airlines
Deal found 3/3![United Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mer. 5/135:40 am
DEN
- PDX
1 stop4h 12m
Delta
sam. 5/165:05 pm
PDX
- DEN
1 stop4h 36m
Delta
Deal found 3/1![Delta logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mar. 5/56:45 am
DEN
- GEG
2 stops15h 46m
Alaska Airlines
mar. 5/1210:30 am
GEG
- DEN
1 stop12h 29m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$218
This Southwest deal was found by Cheapflights users on 3/5. 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.
mar. 4/141:45 pm
DEN
- SEA
2 stops10h 10m
Southwest
mar. 4/2811:40 am
SEA
- DEN
2 stops10h 05m
Southwest
Deal found 3/5![Southwest logo]()
$167
This United Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
mar. 3/313:37 pm
MTJ
- SEA
1 stop6h 29m
United Airlines
mar. 4/75:00 am
SEA
- MTJ
1 stop6h 41m
United Airlines
Deal found 3/3![United Airlines logo]()
$211
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mer. 4/17:40 pm
DEN
- SEA
Nonstop3h 12m
Delta
lun. 4/65:30 am
SEA
- DEN
1 stop5h 03m
Delta
Deal found 3/1![Delta logo]()
$177
This Southwest deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
lun. 5/118:10 pm
DEN
- PDX
1 stop5h 45m
Southwest
mer. 5/137:40 am
PDX
- DEN
2 stops8h 30m
Southwest
Deal found 3/2![Southwest logo]()
$172
This Alaska Airlines deal was found by Cheapflights users on 3/5. 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.
ven. 4/36:20 pm
DEN
- PDX
1 stop6h 39m
Alaska Airlines
ven. 4/101:35 pm
PDX
- DEN
1 stop9h 21m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$232
This United Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
mar. 3/311:33 pm
COS
- SEA
1 stop5h 27m
United Airlines
mar. 4/73:48 pm
SEA
- COS
1 stop5h 09m
United Airlines
Deal found 3/2![United Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 3/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/158:20 pm
DEN
- PDX
Nonstop2h 40m
Southwest
mar. 4/217:40 am
PDX
- DEN
2 stops8h 30m
Southwest
Deal found 3/4![Southwest logo]()
$172
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mar. 4/1411:55 am
COS
- SEA
1 stop7h 35m
Delta
mar. 4/215:35 am
SEA
- COS
1 stop4h 37m
Delta
Deal found 3/1![Delta logo]()
$198
This Alaska Airlines deal was found by Cheapflights users on 3/4. 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.
lun. 4/206:20 pm
DEN
- GEG
1 stop22h 14m
Alaska Airlines
mer. 4/221:51 pm
GEG
- DEN
2 stops9h 08m
Alaska Airlines
Deal found 3/4![Alaska Airlines logo]()
$258
This Southwest deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
ven. 5/18:55 pm
DEN
- PDX
Nonstop2h 45m
Southwest
dim. 5/37:50 am
PDX
- DEN
Nonstop2h 30m
Southwest
Deal found 3/2![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
ven. 5/87:00 am
MTJ
- SEA
2 stops13h 48m
United Airlines
dim. 5/105:05 am
SEA
- MTJ
1 stop6h 36m
United Airlines
Deal found 3/2![United Airlines logo]()
$244
This Southwest deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
mer. 4/228:55 am
DEN
- PDX
2 stops8h 30m
Southwest
mer. 4/297:40 am
PDX
- DEN
2 stops8h 30m
Southwest
Deal found 3/3![Southwest logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
jeu. 4/166:20 pm
DEN
- GEG
1 stop6h 39m
Alaska Airlines
dim. 4/197:19 am
GEG
- DEN
1 stop28h 01m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
ven. 5/225:40 am
DEN
- PSC
1 stop4h 39m
Delta
sam. 5/232:45 pm
PSC
- DEN
1 stop6h 56m
Delta
Deal found 3/1![Delta logo]()
$229
Last-minute flights from Colorado to WashingtonDiscover last-minute flight deals from Colorado to Washington. Data last updated mars 6, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Washington. Data last updated mars 6, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
jeu. 3/269:10 am
DEN
- SEA
Nonstop3h 09m
Frontier
ven. 4/1012:42 pm
SEA
- DEN
Nonstop2h 55m
Frontier
Deal found 3/2![Frontier logo]()
$83
This Trip.com deal was found by Cheapflights users on 3/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 4/29:25 am
DEN
- SEA
Nonstop3h 12m
Multiple Airlines
lun. 4/68:11 pm
SEA
- DEN
Nonstop2h 45m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$93
This Super.com deal was found by Cheapflights users on 3/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/157:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
sam. 4/187:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/4![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
jeu. 4/167:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
dim. 4/269:54 pm
SEA
- DEN
1 stop29h 05m
Frontier
Deal found 3/2![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 3/5. 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.
ven. 4/177:40 am
DEN
- SEA
Nonstop3h 12m
Frontier
sam. 4/257:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/5![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
ven. 4/177:40 am
DEN
- SEA
Nonstop3h 12m
Frontier
ven. 4/177:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/2![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
lun. 4/207:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/3![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 3/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
jeu. 4/237:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/4![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/5. 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.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
sam. 4/257:12 pm
SEA
- DEN
Nonstop2h 47m
Frontier
Deal found 3/5![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mer. 4/226:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
mar. 4/287:12 pm
SEA
- DEN
Nonstop2h 47m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
jeu. 4/236:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
jeu. 4/234:20 pm
SEA
- DEN
Nonstop2h 51m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 4/256:00 am
DEN
- SEA
Nonstop3h 03m
Multiple Airlines
mer. 4/297:12 pm
SEA
- DEN
Nonstop2h 47m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$86
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 mars 6, 2026.
Search for one-way flight options from Colorado to Washington. Find affordable one-way fares based on user searches. Data last updated mars 6, 2026.
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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.
mer. 4/17:40 pm
DEN
- SEA
Nonstop3h 12m
Delta
Deal found 2/28![Delta logo]()
$49
This Kissandfly.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 5/37:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Deal found 3/3![Frontier logo]()
$51
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
sam. 4/187:15 am
DEN
- SEA
Nonstop3h 12m
Frontier
Deal found 3/3![Frontier logo]()
$53
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mar. 4/285:57 pm
DEN
- SEA
1 stop6h 30m
United Airlines
Deal found 3/1![United Airlines logo]()
$54
This Kiwi.com deal was found by Cheapflights users on 3/5. 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.
dim. 6/79:25 am
DEN
- PDX
Nonstop2h 48m
Frontier
Deal found 3/5![Frontier logo]()
$57
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mar. 5/55:05 pm
DEN
- SEA
1 stop7h 50m
Southwest
Deal found 3/1![Southwest logo]()
$59
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
sam. 4/46:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
mer. 5/278:00 am
DEN
- SEA
Nonstop3h 10m
Frontier
Deal found 3/3![Frontier logo]()
$62
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
mar. 4/2810:00 am
DEN
- PDX
Nonstop2h 52m
Frontier
Deal found 3/3![Frontier logo]()
$62
This Cheapflightsfares deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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.
mar. 5/265:52 pm
DEN
- SEA
Nonstop3h 07m
Frontier
Deal found 3/2![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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.
lun. 5/259:25 am
DEN
- PDX
Nonstop2h 48m
Frontier
Deal found 3/3![Frontier logo]()
$63
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
mar. 4/211:45 pm
DEN
- SEA
2 stops10h 10m
Southwest
Deal found 3/1![Southwest logo]()
$64
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 mars 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $80 (Kiwi.com) |
One-way from | $49 (Delta) |
Popular in | June |
Cheapest in | January |
Average price | $217 |
Good round-trip deal | $119 or less |
Good one-way deal | $109 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 mars 6, 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
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
jeu. 4/23
8:35 pm-10:33 pm
Nonstop2h 58m
Seattle/Tacoma Intl
lun. 4/27
5:00 am-8:44 am
Nonstop2h 44m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
jeu. 4/23
6:00 am-8:03 am
Nonstop3h 03m
Seattle/Tacoma Intl
dim. 4/26
8:05 pm-11:59 pm
Nonstop2h 54m
$97
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
mer. 5/13
5:05 pm-11:55 pm
1 stop7h 50m
Seattle/Tacoma Intl
lun. 5/18
5:30 am-9:05 am
Nonstop2h 35m
$107
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
sam. 5/9
6:19 pm-10:03 pm
1 stop4h 44m
Seattle/Tacoma Intl
dim. 5/17
7:59 pm-11:52 pm
Nonstop2h 53m
$137
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
mar. 3/31
6:15 pm-12:03 am
1 stop6h 48m
Seattle/Tacoma Intl
mar. 4/7
7:46 pm-11:32 pm
Nonstop2h 46m
$137
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
mer. 4/8
6:15 pm-12:03 am
1 stop6h 48m
Seattle/Tacoma Intl
lun. 4/13
8:00 pm-11:50 pm
Nonstop2h 50m
$137
Colorado SpringsSeattle
COS - SEA
COSSEA
Colorado Springs
mer. 4/8
8:15 am-2:54 pm
1 stop7h 39m
Seattle/Tacoma Intl
mar. 4/14
5:35 am-11:12 am
1 stop4h 37m
$137
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
mer. 4/15
1:45 pm-10:55 pm
2 stops10h 10m
Seattle/Tacoma Intl
sam. 4/18
5:10 am-2:20 pm
2 stops8h 10m
$147
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
jeu. 4/23
3:50 pm-10:35 pm
1 stop7h 45m
Seattle/Tacoma Intl
lun. 4/27
5:30 am-9:05 am
Nonstop2h 35m
$147
Colorado SpringsSeattle
COS - SEA
COSSEA
Colorado Springs
ven. 5/1
7:20 pm-12:55 am
1 stop6h 35m
Seattle/Tacoma Intl
lun. 5/4
5:35 pm-11:50 pm
1 stop5h 15m
$151
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-GEG
DEN-PDX
COS-SEA
DEN-PSC
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Colorado to Washington
USCO-USWA
DEN-SEA
DEN-GEG
DEN-PDX
COS-SEA
What is the cheapest month to book a flight from Colorado to State of Washington?
Currently, September is the cheapest month in which you can book a flight from Colorado to State of Washington (average of $49). Flying from Colorado to State of Washington in July is currently the most expensive (average of $98). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from CO to WA?
Find hourly flight availability from Colorado to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated mars 6, 2026.
It’s optimal to fly from Colorado to State of Washington in the evening. By choosing this option you can save up to 33% on the cost of your flight, compared to a flight in the afternoon.
What is the cheapest day to fly from Colorado to State of Washington?
Use this chart to determine the cheapest time to fly round-trip from Colorado to Washington. Price data was last updated on February 21, 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 mars 6, 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
Comfort
7.8
Crew
8.5
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Overall
8.0
Entertainment
7.0
Comfort
7.8
Crew
8.5
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Related info for your journey
Find useful and relevant information for your journey from Colorado to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Colorado to Washington
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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
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 mars 6, 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 mars 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$159 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$93 | Average$347 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$108 | Average$321 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$117 | Average$348 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$117 | Average$399 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$130 | Average$413 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$186 | Average$378 | FlexibilityNo cancel fee | On-time71% |