$104+ Cheap flights from Colorado to Seattle (SEA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Nov 29 — Dec 61
Round-trip
1 adult, Economy
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Find cheap flights from Colorado to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Colorado to Seattle
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Cheapest flights from Colorado to SeattleExplore the most affordable flight options available from Colorado to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from Colorado to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:42 am -
1 stop6h 55m
Sat 12/54:58 pm -
Nonstop2h 50m
Deal found 10/29![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:42 am -
1 stop6h 55m
Mon 12/74:58 pm -
Nonstop2h 50m
Deal found 10/29![Frontier logo]()
$163
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2510:29 pm -
2 stops23h 09m
Wed 12/24:58 pm -
Nonstop2h 48m
Deal found 10/28![Frontier logo]()
$164
This Super.com deal was found by Cheapflights users on 10/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/181:04 pm -
Nonstop3h 08m
Fri 11/204:37 pm -
Nonstop2h 48m
Deal found 10/27![Frontier logo]()
$165
This Trip.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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.
Sat 11/211:14 pm -
Nonstop3h 08m
Thu 11/264:37 pm -
Nonstop2h 48m
Deal found 10/30![Frontier logo]()
$166
This Cheapflightsfares deal was found by Cheapflights users on 10/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/121:32 pm -
Nonstop3h 11m
Sat 12/197:57 pm -
1 stop15h 21m
Deal found 10/27![Frontier logo]()
$167
This FlightHub deal was found by Cheapflights users on 10/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/231:14 pm -
Nonstop3h 08m
Wed 12/24:58 pm -
Nonstop2h 48m
Deal found 10/26![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 10/26. 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.
Mon 11/1610:55 pm -
1 stop20h 38m
Wed 11/187:48 pm -
1 stop18h 23m
Deal found 10/26![Frontier logo]()
$169
This Cheapflightsfares deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/194:20 pm -
1 stop21h 17m
Mon 11/234:37 pm -
Nonstop2h 48m
Deal found 10/29![Frontier logo]()
$171
This CheapOair deal was found by Cheapflights users on 10/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/210:29 pm -
1 stop22h 33m
Wed 12/94:58 pm -
Nonstop2h 50m
Deal found 10/28![Frontier logo]()
$172
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/196:08 pm -
1 stop6h 51m
Thu 11/2611:30 am -
1 stop4h 58m
Deal found 10/29![Delta logo]()
$287
This Delta deal was found by Cheapflights users on 10/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/56:05 pm -
1 stop5h 42m
Thu 12/1012:31 pm -
2 stops8h 53m
Deal found 10/27![Delta logo]()
$292
Best flights from Colorado to SeattleDiscover carefully curated flight deals from Colorado to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from Colorado to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:35 pm -
1 stop8h 10m
Wed 12/26:30 am -
2 stops9h 55m
Deal found 10/28![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 10/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/71:17 pm -
Nonstop3h 07m
Thu 12/247:57 pm -
Nonstop2h 49m
Deal found 10/26![Delta logo]()
$252
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/226:28 pm -
Nonstop3h 08m
Fri 12/255:05 pm -
Nonstop2h 39m
Deal found 10/28![Alaska Airlines logo]()
$267
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/101:40 pm -
1 stop5h 44m
Mon 12/145:05 am -
1 stop6h 32m
Deal found 10/29![United Airlines logo]()
$287
This American Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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.
Thu 1/2112:00 pm -
1 stop6h 49m
Tue 1/2611:26 am -
1 stop6h 31m
Deal found 10/30![American Airlines logo]()
$358
This Alaska Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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.
Sun 12/67:24 pm -
Nonstop3h 16m
Tue 12/810:09 am -
Nonstop2h 44m
Deal found 10/30![Alaska Airlines logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 10/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/11:54 pm -
2 stops19h 22m
Sat 12/57:38 am -
1 stop5h 46m
Deal found 10/27![Alaska Airlines logo]()
$268
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:35 pm -
1 stop8h 10m
Tue 12/15:40 am -
2 stops9h 50m
Deal found 10/28![Southwest logo]()
$297
This Delta deal was found by Cheapflights users on 10/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/276:30 pm -
Nonstop3h 11m
Thu 3/116:05 am -
1 stop8h 51m
Deal found 10/26![Delta logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 10/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:40 am -
1 stop6h 25m
Tue 12/18:09 pm -
1 stop15h 47m
Deal found 10/27![Alaska Airlines logo]()
$275
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/141:20 pm -
1 stop5h 39m
Sat 11/213:49 pm -
1 stop7h 10m
Deal found 10/29![United Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 10/28. 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.
Tue 1/1912:12 pm -
1 stop5h 24m
Tue 1/265:35 am -
1 stop4h 52m
Deal found 10/28![Delta logo]()
$327
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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.
Thu 12/3112:15 pm -
Nonstop3h 08m
Tue 1/53:44 pm -
1 stop4h 25m
Deal found 10/25![Alaska Airlines logo]()
$277
This United Airlines deal was found by Cheapflights users on 10/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/155:00 am -
1 stop5h 47m
Sat 11/213:49 pm -
1 stop4h 57m
Deal found 10/25![United Airlines logo]()
$358
This Alaska Airlines deal was found by Cheapflights users on 10/25. 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.
Thu 12/37:24 pm -
Nonstop3h 16m
Sun 12/62:25 pm -
1 stop6h 03m
Deal found 10/25![Alaska Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 1/78:06 am -
2 stops10h 11m
Mon 1/115:35 am -
1 stop4h 52m
Deal found 10/30![Delta logo]()
$352
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/33:11 pm -
1 stop7h 10m
Tue 12/88:30 am -
1 stop7h 30m
Deal found 10/29![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 10/28. 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.
Wed 3/3111:16 am -
1 stop4h 44m
Wed 4/281:30 pm -
1 stop3h 45m
Deal found 10/28![Delta logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 1/111:49 am -
1 stop5h 05m
Mon 1/48:31 am -
1 stop4h 37m
Deal found 10/29![Alaska Airlines logo]()
$297
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Tue 11/107:00 am -
2 stops10h 12m
Sat 11/1412:45 pm -
1 stop6h 47m
Deal found 10/26![United Airlines logo]()
$366
This Delta deal was found by Cheapflights users on 10/28. 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.
Thu 12/31:11 pm -
1 stop4h 44m
Tue 12/85:30 am -
1 stop6h 06m
Deal found 10/28![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/198:45 am -
2 stops14h 14m
Tue 1/268:30 am -
1 stop7h 00m
Deal found 10/28![United Airlines logo]()
$372
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 2/51:11 pm -
1 stop4h 25m
Mon 2/85:35 am -
1 stop5h 57m
Deal found 10/29![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 10/25. 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.
Tue 12/16:05 pm -
1 stop7h 00m
Mon 12/711:30 am -
1 stop4h 53m
Deal found 10/25![Delta logo]()
$363
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am -
2 stops10h 27m
Mon 11/163:49 pm -
1 stop4h 57m
Deal found 10/27![United Airlines logo]()
$414
This Delta deal was found by Cheapflights users on 10/25. 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.
Fri 12/111:11 pm -
2 stops9h 51m
Mon 1/185:35 am -
1 stop5h 57m
Deal found 10/25![Delta logo]()
$364
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/83:25 pm -
2 stops8h 50m
Sun 1/1012:30 pm -
1 stop7h 09m
Deal found 10/27![United Airlines logo]()
$426
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 2/241:11 pm -
2 stops8h 20m
Wed 3/249:30 am -
2 stops7h 45m
Deal found 10/29![Delta logo]()
$369
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:30 am -
1 stop5h 17m
Mon 11/165:05 am -
1 stop6h 16m
Deal found 10/27![United Airlines logo]()
$429
This Delta deal was found by Cheapflights users on 10/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/161:16 pm -
1 stop4h 37m
Sat 11/215:35 am -
1 stop4h 05m
Deal found 10/26![Delta logo]()
$374
Last-minute flights from Colorado to SeattleDiscover last-minute flight deals from Colorado to Seattle. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Seattle. Data last updated October 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/141:20 pm -
1 stop5h 39m
Sat 11/213:49 pm -
1 stop7h 10m
Deal found 10/29![United Airlines logo]()
$358
This United Airlines deal was found by Cheapflights users on 10/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/155:00 am -
1 stop5h 47m
Sat 11/213:49 pm -
1 stop4h 57m
Deal found 10/25![United Airlines logo]()
$358
This Cheapflightsfares deal was found by Cheapflights users on 10/26. 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.
Mon 11/1610:55 pm -
1 stop20h 38m
Wed 11/187:48 pm -
1 stop18h 23m
Deal found 10/26![Frontier logo]()
$169
This Super.com deal was found by Cheapflights users on 10/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/181:04 pm -
Nonstop3h 08m
Fri 11/204:37 pm -
Nonstop2h 48m
Deal found 10/27![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/181:04 pm -
Nonstop3h 08m
Mon 11/239:53 pm -
1 stop16h 08m
Deal found 10/29![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/199:10 am -
1 stop11h 58m
Thu 11/264:37 pm -
Nonstop2h 48m
Deal found 10/29![Frontier logo]()
$171
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/196:08 pm -
1 stop6h 51m
Thu 11/2611:30 am -
1 stop4h 58m
Deal found 10/29![Delta logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:42 am -
1 stop6h 55m
Sat 12/54:58 pm -
Nonstop2h 50m
Deal found 10/29![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:42 am -
1 stop6h 55m
Mon 12/74:58 pm -
Nonstop2h 50m
Deal found 10/29![Frontier logo]()
$163
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/231:14 pm -
Nonstop3h 08m
Wed 12/24:58 pm -
Nonstop2h 48m
Deal found 10/28![Frontier logo]()
$166
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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.
Tue 11/241:20 pm -
2 stops9h 30m
Tue 12/15:05 am -
1 stop4h 29m
Deal found 10/29![United Airlines logo]()
$345
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2510:29 pm -
2 stops23h 09m
Wed 12/24:58 pm -
Nonstop2h 48m
Deal found 10/28![Frontier logo]()
$164
One-way flights from Colorado to SeattleSearch for one-way flight options from Colorado to Seattle. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
Search for one-way flight options from Colorado to Seattle. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
This Super.com deal was found by Cheapflights users on 10/26. 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.
Wed 12/24:55 pm -
1 stop20h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 10/28. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/206:42 am -
1 stop6h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$112
This Trip.com deal was found by Cheapflights users on 10/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/710:57 pm -
1 stop16h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Multiple Airlines logo]()
$113
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/11:17 pm -
Nonstop3h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Delta logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/149:36 am -
1 stop8h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/1012:54 pm -
1 stop6h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$116
This Cheapflightsfares deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:42 am -
1 stop6h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Frontier logo]()
$117
This Super.com deal was found by Cheapflights users on 10/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:54 pm -
1 stop6h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$118
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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.
Tue 12/155:52 pm -
1 stop6h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![United Airlines logo]()
$119
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1412:54 pm -
1 stop6h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$120
This WAYA deal was found by Cheapflights users on 10/27. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/18:57 pm -
1 stop12h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$121
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/195:05 pm -
1 stop7h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![United Airlines logo]()
$144
Find flight deals from Colorado to Seattle
Keep the following information in mind while searching for Colorado to Seattle flight deals. Data was last updated October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $162 (Kiwi.com) |
One-way from | $104 (Super.com) |
Popular in | July |
Cheapest in | January |
Average price | $274 |
Good round-trip deal | $279 or less |
Good one-way deal | $180 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Colorado to Seattle 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 7,457,451 searches. Data last updated October 30, 2026.
Use the filters below to find and compare flights from Colorado to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Thu 11/19
6:00 am-8:12 am
Nonstop3h 12m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$114
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Thu 12/3
1:17 pm-3:24 pm
Nonstop3h 07m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$114
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Tue 12/8
7:40 am-11:40 am
1 stop5h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$124
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sat 1/2
6:00 am-8:10 am
Nonstop3h 10m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Quickest round-trip
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sun 12/6
7:40 am-9:46 am
Nonstop3h 06m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sun 12/6
1:17 pm-3:24 pm
Nonstop3h 07m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sun 12/20
6:05 am-8:23 am
Nonstop3h 18m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sun 1/3
6:35 pm-8:46 pm
Nonstop3h 11m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sun 12/27
6:05 am-8:23 am
Nonstop3h 18m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Thu 12/10
6:00 am-8:18 am
Nonstop3h 18m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Colorado to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Colorado with our price prediction graph.
DEN-SEA
COS-SEA
DRO-SEA
GJT-SEA
HDN-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 Seattle
USCO-SEA
DEN-SEA
COS-SEA
DRO-SEA
GJT-SEA
What is the cheapest month to book a flight from Colorado to Seattle?
Currently, January is the cheapest month in which you can book a flight from Colorado to Seattle (average of $176). Flying from Colorado to Seattle in July is currently the most expensive (average of $333). 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 SEA?
Find hourly flight availability from Colorado to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 36% on flights from Colorado to Seattle by exploring options for tickets in the evening.
How much does it cost to fly round-trip from Colorado to Seattle?
Airfare is below average for this route at the moment.
Colorado to Seattle flights typically cost between $164 and $359 in November.The cheapest round-trip price found within the last 5 days was $162 on Frontier (Nov 23-Dec 5).
How far ahead should I book a flight from Colorado to Seattle?
The price you pay for your flight from Colorado to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 46 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 Colorado to Seattle?
Use this chart to determine the cheapest time to fly round-trip from Colorado to Seattle. Price data was last updated on October 24, 2026.
Travelers seeking maximum savings on their Colorado to Seattle flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Colorado to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Tukwila
Snoqualmie
Puyallup
Lynnwood
Olympia
Centralia
Kent
Tumwater
Ocean Shores
Ellensburg
Issaquah
Lakewood
Poulsbo
Marysville
Shoreline
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Colorado to Seattle
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Complete your trip
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Search flights from Colorado to Seattle by cabin class
Find flights from Colorado to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Colorado and Seattle flights
Browse other Colorado and Seattle flight options. Last updated on October 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 30, 2026.
Colorado to Seattle flights
Consider these flights traveling from Colorado to Seattle.
Top 6 airlines flying from Colorado to Seattle
Discover the top 6 airlines that operate flights from Colorado to Seattle. 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 7,457,451 searches. Data last updated October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$216 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$80 | Average$324 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$117 | Average$392 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$117 | Average$458 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$136 | Average$434 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$244 | Average$478 | FlexibilityNo cancel fee | On-time71% |