$109+ Cheap flights from Seattle (SEA) to Colorado
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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
Aug 26 — Sep 21
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Colorado with Cheapflights
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Cheapest flights from Seattle to ColoradoExplore the most affordable flight options available from Seattle to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 27, 2026.
Explore the most affordable flight options available from Seattle to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 27, 2026.
This Travelocity deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:11 pm
SEA
- DEN
Nonstop2h 48m
Multiple Airlines
Mon 8/247:15 am
DEN
- SEA
Nonstop3h 04m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$143
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/147:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Sun 8/167:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/24![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/219:29 pm
SEA
- DEN
1 stop10h 36m
Frontier
Tue 8/257:15 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/26![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/217:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Wed 8/268:45 am
DEN
- SEA
1 stop11h 53m
Frontier
Deal found 7/24![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/158:15 pm
SEA
- DEN
1 stop12h 17m
Frontier
Sat 9/191:07 pm
DEN
- SEA
Nonstop3h 01m
Frontier
Deal found 7/24![Frontier logo]()
$147
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/147:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Thu 8/207:15 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/25![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/202:37 pm
SEA
- DEN
Nonstop2h 56m
Frontier
Wed 8/268:45 am
DEN
- SEA
1 stop11h 53m
Frontier
Deal found 7/26![Frontier logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:11 pm
SEA
- DEN
Nonstop2h 48m
Multiple Airlines
Sat 8/227:15 am
DEN
- SEA
Nonstop3h 04m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$151
This Cheapflightsfares deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Thu 8/1311:00 am
DEN
- SEA
Nonstop3h 17m
Frontier
Deal found 7/22![Frontier logo]()
$152
This Super.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:00 am
SEA
- DEN
Nonstop2h 51m
Frontier
Sun 10/47:45 am
DEN
- SEA
Nonstop3h 06m
Frontier
Deal found 7/22![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/99:45 pm
SEA
- DEN
1 stop11h 22m
Frontier
Wed 9/161:07 pm
DEN
- SEA
Nonstop3h 01m
Frontier
Deal found 7/26![Frontier logo]()
$154
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/305:00 am
SEA
- HDN
1 stop6h 41m
United Airlines
Tue 10/67:05 am
HDN
- SEA
2 stops9h 28m
United Airlines
Deal found 7/24![United Airlines logo]()
$252
Best flights from Seattle to ColoradoDiscover carefully curated flight deals from Seattle to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 27, 2026.
Discover carefully curated flight deals from Seattle to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 27, 2026.
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:00 am
SEA
- DEN
Nonstop2h 45m
United Airlines
Thu 8/209:03 pm
DEN
- SEA
Nonstop3h 01m
United Airlines
Deal found 7/26![United Airlines logo]()
$220
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:50 pm
SEA
- DEN
1 stop8h 02m
Delta
Mon 8/246:28 pm
DEN
- SEA
1 stop4h 37m
Delta
Deal found 7/24![Delta logo]()
$227
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/2111:50 am
SEA
- DEN
1 stop5h 55m
Southwest
Tue 8/2512:50 pm
DEN
- SEA
2 stops8h 25m
Southwest
Deal found 7/26![Southwest logo]()
$232
This Alaska Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2511:41 am
SEA
- DEN
1 stop6h 45m
Alaska Airlines
Sat 8/298:08 am
DEN
- SEA
1 stop6h 37m
Alaska Airlines
Deal found 7/25![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/295:00 am
SEA
- DEN
1 stop6h 10m
Southwest
Sat 8/294:10 pm
DEN
- SEA
1 stop7h 45m
Southwest
Deal found 7/24![Southwest logo]()
$242
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 1/207:40 pm
SEA
- DEN
Nonstop2h 48m
Delta
Wed 2/36:30 pm
DEN
- SEA
Nonstop3h 11m
Delta
Deal found 7/25![Delta logo]()
$247
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:05 pm
SEA
- COS
1 stop4h 54m
United Airlines
Mon 10/56:03 pm
COS
- SEA
1 stop5h 56m
United Airlines
Deal found 7/22![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/63:00 pm
SEA
- COS
1 stop5h 40m
Southwest
Tue 10/136:30 am
COS
- SEA
2 stops8h 25m
Southwest
Deal found 7/22![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:07 pm
SEA
- DEN
Nonstop2h 51m
Delta
Sun 9/66:20 am
DEN
- SEA
Nonstop2h 59m
Delta
Deal found 7/22![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:30 am
SEA
- COS
1 stop5h 40m
Southwest
Sat 9/192:00 pm
COS
- SEA
1 stop6h 35m
Southwest
Deal found 7/24![Southwest logo]()
$267
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” 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.
Fri 9/411:16 pm
SEA
- EGE
1 stop9h 31m
American Airlines
Sun 9/67:50 am
EGE
- SEA
1 stop9h 50m
American Airlines
Deal found 7/27![American Airlines logo]()
$659
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/272:34 pm
SEA
- GJT
1 stop5h 01m
United Airlines
Sat 8/2911:15 am
GJT
- SEA
2 stops10h 28m
United Airlines
Deal found 7/26![United Airlines logo]()
$324
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/203:40 pm
SEA
- DEN
1 stop6h 20m
Southwest
Sun 8/237:35 am
DEN
- SEA
2 stops7h 25m
Southwest
Deal found 7/26![Southwest logo]()
$278
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:15 am
SEA
- GJT
2 stops10h 03m
Delta
Sun 9/136:53 pm
GJT
- SEA
1 stop4h 17m
Delta
Deal found 7/23![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/203:25 pm
SEA
- DEN
2 stops7h 20m
Southwest
Mon 8/247:00 pm
DEN
- SEA
1 stop6h 20m
Southwest
Deal found 7/26![Southwest logo]()
$278
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:00 am
SEA
- DRO
1 stop6h 32m
United Airlines
Wed 9/97:00 am
DRO
- SEA
2 stops10h 14m
United Airlines
Deal found 7/22![United Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/612:30 pm
SEA
- COS
2 stops9h 02m
Delta
Sun 10/116:10 pm
COS
- SEA
1 stop6h 49m
Delta
Deal found 7/23![Delta logo]()
$333
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:20 am
SEA
- DEN
2 stops9h 15m
Southwest
Wed 8/262:40 pm
DEN
- SEA
2 stops7h 35m
Southwest
Deal found 7/22![Southwest logo]()
$278
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 9/1212:35 pm
SEA
- GJT
2 stops8h 22m
Delta
Mon 9/216:53 pm
GJT
- SEA
1 stop4h 17m
Delta
Deal found 7/25![Delta logo]()
$334
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/199:15 am
SEA
- DEN
2 stops9h 20m
Southwest
Sat 9/2611:40 am
DEN
- SEA
2 stops10h 15m
Southwest
Deal found 7/24![Southwest logo]()
$278
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/308:30 am
SEA
- HDN
1 stop5h 03m
United Airlines
Tue 10/61:43 pm
HDN
- SEA
1 stop4h 54m
United Airlines
Deal found 7/24![United Airlines logo]()
$393
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1912:40 pm
SEA
- DEN
2 stops7h 40m
Southwest
Sun 8/238:05 am
DEN
- SEA
1 stop6h 55m
Southwest
Deal found 7/25![Southwest logo]()
$278
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/295:00 am
SEA
- MTJ
1 stop6h 45m
United Airlines
Wed 9/23:24 pm
MTJ
- SEA
1 stop6h 51m
United Airlines
Deal found 7/22![United Airlines logo]()
$397
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/216:15 am
SEA
- COS
1 stop7h 00m
Southwest
Tue 8/257:20 am
COS
- SEA
2 stops9h 10m
Southwest
Deal found 7/26![Southwest logo]()
$298
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:00 am
SEA
- MTJ
1 stop6h 35m
United Airlines
Sat 10/243:23 pm
MTJ
- SEA
1 stop6h 52m
United Airlines
Deal found 7/23![United Airlines logo]()
$397
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/101:24 pm
SEA
- GJT
1 stop3h 54m
Delta
Mon 9/146:53 pm
GJT
- SEA
1 stop6h 06m
Delta
Deal found 7/23![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 11/1112:45 pm
SEA
- GJT
1 stop6h 52m
United Airlines
Sat 11/147:00 am
GJT
- SEA
1 stop7h 55m
United Airlines
Deal found 7/26![United Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:30 am
SEA
- COS
1 stop5h 40m
Southwest
Sat 8/297:00 am
COS
- SEA
2 stops8h 25m
Southwest
Deal found 7/26![Southwest logo]()
$302
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/222:27 pm
SEA
- MTJ
1 stop5h 12m
United Airlines
Tue 10/277:30 am
MTJ
- SEA
2 stops9h 57m
United Airlines
Deal found 7/23![United Airlines logo]()
$402
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:20 am
SEA
- COS
1 stop9h 40m
Southwest
Sat 9/511:35 am
COS
- SEA
1 stop7h 45m
Southwest
Deal found 7/25![Southwest logo]()
$303
Last-minute flights from Seattle to ColoradoDiscover last-minute flight deals from Seattle to Colorado. Data last updated July 27, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Colorado. Data last updated July 27, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/17:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Sun 8/307:15 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/26![Frontier logo]()
$193
This Cheapflightsfares deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/112:35 pm
SEA
- DEN
Nonstop3h 05m
Frontier
Wed 8/1211:00 am
DEN
- SEA
Nonstop3h 17m
Frontier
Deal found 7/22![Frontier logo]()
$207
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/47:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Tue 8/117:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/22![Frontier logo]()
$173
This Cheapflightsfares deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/47:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Sun 8/167:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/22![Frontier logo]()
$197
This Cheapflightsfares deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/52:22 pm
SEA
- DEN
Nonstop2h 56m
Frontier
Tue 8/187:15 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/22![Frontier logo]()
$171
This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/52:22 pm
SEA
- DEN
Nonstop2h 56m
Frontier
Tue 8/117:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/23![Frontier logo]()
$202
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/67:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Sat 8/157:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/25![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/67:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Thu 8/137:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/23![Frontier logo]()
$188
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/67:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Mon 8/107:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/25![Frontier logo]()
$192
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/67:06 pm
SEA
- DEN
Nonstop2h 52m
Frontier
Sat 8/87:00 am
DEN
- SEA
Nonstop3h 04m
Frontier
Deal found 7/25![Frontier logo]()
$194
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:05 pm
SEA
- COS
1 stop6h 45m
Southwest
Mon 8/246:45 pm
COS
- SEA
1 stop6h 35m
Southwest
Deal found 7/23![Southwest logo]()
$288
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:30 am
SEA
- COS
1 stop5h 40m
Southwest
Sat 8/296:20 am
COS
- SEA
1 stop9h 00m
Southwest
Deal found 7/27![Southwest logo]()
$273
One-way flights from Seattle to ColoradoSearch for one-way flight options from Seattle to Colorado. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
Search for one-way flight options from Seattle to Colorado. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:59 am
SEA
- DEN
1 stop7h 19m
Delta
Deal found 7/23![Delta logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2711:15 am
SEA
- DEN
1 stop21h 11m
Frontier
Deal found 7/23![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/69:29 pm
SEA
- DEN
1 stop29h 19m
Frontier
Deal found 7/24![Frontier logo]()
$111
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/302:37 pm
SEA
- DEN
Nonstop2h 56m
Frontier
Deal found 7/25![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/169:16 pm
SEA
- DEN
2 stops16h 21m
Frontier
Deal found 7/22![Frontier logo]()
$113
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1512:36 pm
SEA
- DEN
1 stop8h 13m
Delta
Deal found 7/24![Delta logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:53 pm
SEA
- DEN
2 stops19h 17m
Frontier
Deal found 7/22![Frontier logo]()
$115
This Cheapflightsfares deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 11/17:41 pm
SEA
- DEN
Nonstop2h 53m
Frontier
Deal found 7/26![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:06 am
SEA
- DEN
1 stop21h 34m
Frontier
Deal found 7/22![Frontier logo]()
$117
This Expedia deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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.
Sat 12/55:25 pm
SEA
- DEN
Nonstop2h 51m
Frontier
Deal found 7/26![Frontier logo]()
$118
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/299:20 am
SEA
- DEN
2 stops9h 15m
Southwest
Deal found 7/26![Southwest logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:57 am
SEA
- DEN
2 stops24h 14m
Frontier
Deal found 7/27![Frontier logo]()
$120
Find flight deals from Seattle to Colorado
Keep the following information in mind while searching for Seattle to Colorado flight deals. Data was last updated July 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $139 (Frontier) |
One-way from | $109 (Delta) |
Popular in | June |
Cheapest in | January |
Average price | $314 |
Good round-trip deal | $253 or less |
Good one-way deal | $169 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to Colorado that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 27, 2026.
Use the filters below to find and compare flights from Seattle to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 8/20
5:00 am-8:45 am
Nonstop2h 45m
Denver Intl
Thu 8/20
9:03 pm-11:04 pm
Nonstop3h 01m
$220
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 8/21
2:50 pm-11:52 pm
1 stop8h 02m
Denver Intl
Mon 8/24
6:28 pm-10:05 pm
1 stop4h 37m
$227
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 8/21
11:50 am-6:45 pm
1 stop5h 55m
Denver Intl
Tue 8/25
12:50 pm-8:15 pm
2 stops8h 25m
$232
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 8/29
5:00 am-12:10 pm
1 stop6h 10m
Denver Intl
Sat 8/29
4:10 pm-10:55 pm
1 stop7h 45m
$242
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 1/20
7:40 pm-11:28 pm
Nonstop2h 48m
Denver Intl
Wed 2/3
6:30 pm-8:41 pm
Nonstop3h 11m
$247
SeattleColorado Springs
SEA - COS
SEACOS
Seattle/Tacoma Intl
Thu 10/1
6:05 pm-11:59 pm
1 stop4h 54m
Colorado Springs
Mon 10/5
6:03 pm-10:59 pm
1 stop5h 56m
$257
SeattleColorado Springs
SEA - COS
SEACOS
Seattle/Tacoma Intl
Tue 10/6
3:00 pm-9:40 pm
1 stop5h 40m
Colorado Springs
Tue 10/13
6:30 am-1:55 pm
2 stops8h 25m
$262
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 9/5
8:07 pm-11:58 pm
Nonstop2h 51m
Denver Intl
Sun 9/6
6:20 am-8:19 am
Nonstop2h 59m
$267
SeattleColorado Springs
SEA - COS
SEACOS
Seattle/Tacoma Intl
Sat 9/12
5:30 am-12:10 pm
1 stop5h 40m
Colorado Springs
Sat 9/19
2:00 pm-7:35 pm
1 stop6h 35m
$267
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 8/20
3:40 pm-11:00 pm
1 stop6h 20m
Denver Intl
Sun 8/23
7:35 am-2:00 pm
2 stops7h 25m
$278
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Seattle to Colorado
Have a flexible travel schedule? Discover the best time to fly to Colorado from Seattle with our price prediction graph.
SEA-DEN
SEA-HDN
SEA-COS
SEA-EGE
SEA-GJT
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 Seattle to Colorado
SEA-USCO
SEA-DEN
SEA-HDN
SEA-COS
SEA-EGE
What is the cheapest month to book a flight from Seattle to Colorado?
Currently, January is the cheapest month in which you can book a flight from Seattle to Colorado (average of $195). Flying from Seattle to Colorado in June is currently the most expensive (average of $348). 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 SEA to CO?
Find hourly flight availability from Seattle to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 27, 2026.
A simple way to save on the total cost of your ticket is to fly from Seattle to Colorado in the evening. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight in the morning.
Weekly flight availability from Seattle to Colorado
Explore weekly flight availability from Seattle to Colorado. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 27, 2026.
The most flights from SEA to USCO are scheduled on a Friday (49 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (28 on average).
How much does it cost to fly round-trip from Seattle to Colorado?
Airfare is below average for this route at the moment.
Seattle to Colorado flights typically cost between $167 and $322 in August.The cheapest round-trip price found within the last 5 days was $139 on Frontier (Aug 25-Sep 4).
How far ahead should I book a flight from Seattle to Colorado?
The price you pay for your flight from Seattle to Colorado may vary depending on when you book. For the best chance of a lower fare, look to book 73 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Seattle to Colorado?
Use this chart to determine the cheapest time to fly round-trip from Seattle to Colorado. Price data was last updated on July 25, 2026.
Travelers seeking maximum savings on their Seattle to Colorado flight should consider departing on Saturday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Colorado
Get insights into the airlines that provide service to Colorado. 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 Colorado. Reviews last updated July 27, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta from Seattle to Colorado have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Seattle to Colorado. 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 Seattle to Colorado
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Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Seattle to Colorado by cabin class
Find flights from Seattle to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Colorado flights
Browse other Seattle and Colorado flight options. Last updated on July 27, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Seattle to Colorado flights
Consider these flights traveling from Seattle to Colorado.
Top 8 airlines flying from Seattle to Colorado
Discover the top 8 airlines that operate flights from Seattle to Colorado. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$182 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$69 | Average$203 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$90 | Average$287 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$117 | Average$405 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$117 | Average$329 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$132 | Average$456 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$200 | Average$328 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$274 | Average$491 | FlexibilityNo cancel fee | On-time71% |