$122+ Cheap flights from Dulles Intl (IAD) to Colorado
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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Oct 22 — Oct 291
Round-trip
1 adult, Economy
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Cheapest flights from Dulles Intl to ColoradoExplore the most affordable flight options available from Dulles Intl to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2026.
Explore the most affordable flight options available from Dulles Intl to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/1412:30 pm -
1 stop11h 19m
Sun 10/186:56 pm -
1 stop15h 54m
Deal found 9/18![Frontier logo]()
$248
This Cheapflightsfares deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/179:06 pm -
1 stop13h 00m
Wed 10/217:31 am -
1 stop20h 49m
Deal found 9/18![Frontier logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:00 am -
1 stop8h 41m
Mon 10/196:30 am -
2 stops32h 43m
Deal found 9/20![Frontier logo]()
$250
This Mytrip deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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.
Fri 10/169:06 pm -
2 stops16h 16m
Mon 10/199:12 pm -
2 stops18h 01m
Deal found 9/20![Frontier logo]()
$251
This Mytrip deal was found by Cheapflights users on 9/22. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:50 am -
1 stop15h 41m
Mon 10/199:12 pm -
2 stops18h 01m
Deal found 9/22![Frontier logo]()
$254
This Frontier deal was found by Cheapflights users on 9/22. 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.
Fri 11/139:06 pm -
1 stop13h 16m
Wed 11/189:20 pm -
2 stops17h 52m
Deal found 9/22![Frontier logo]()
$255
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 12/110:33 pm -
1 stop10h 03m
Thu 12/1010:26 am -
1 stop7h 45m
Deal found 9/19![Frontier logo]()
$256
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/259:06 pm -
1 stop13h 00m
Wed 10/289:20 pm -
1 stop12h 16m
Deal found 9/17![Frontier logo]()
$257
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/166:00 am -
1 stop19h 43m
Tue 10/207:02 pm -
1 stop13h 15m
Deal found 9/19![Frontier logo]()
$258
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/136:00 am -
1 stop8h 48m
Wed 10/149:19 pm -
1 stop12h 15m
Deal found 9/17![Frontier logo]()
$259
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/316:00 am -
1 stop8h 21m
Sat 11/78:17 am -
1 stop9h 52m
Deal found 9/17![Delta logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 12/33:08 pm -
1 stop28h 12m
Mon 12/146:10 pm -
2 stops18h 39m
Deal found 9/19![Multiple Airlines logo]()
$332
Best flights from Dulles Intl to ColoradoDiscover carefully curated flight deals from Dulles Intl to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 22, 2026.
Discover carefully curated flight deals from Dulles Intl to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 22, 2026.
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/316:00 am -
1 stop8h 21m
Sat 11/76:07 pm -
2 stops13h 12m
Deal found 9/17![Delta logo]()
$296
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 12/98:22 am -
Nonstop4h 04m
Sun 12/132:10 pm -
Nonstop3h 20m
Deal found 9/21![United Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/297:02 am -
1 stop11h 57m
Wed 11/46:37 pm -
1 stop9h 07m
Deal found 9/21![Alaska Airlines logo]()
$398
This American Airlines deal was found by Cheapflights users on 9/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/277:14 am -
1 stop6h 57m
Sat 3/62:16 pm -
1 stop7h 07m
Deal found 9/22![American Airlines logo]()
$479
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/298:13 am -
1 stop6h 17m
Mon 11/26:00 am -
1 stop6h 09m
Deal found 9/17![Delta logo]()
$333
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 2/1210:10 pm -
Nonstop3h 45m
Tue 2/1611:50 pm -
Nonstop3h 18m
Deal found 9/17![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 12/310:15 pm -
Nonstop4h 07m
Tue 12/85:55 pm -
Nonstop3h 20m
Deal found 9/21![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/86:00 am -
1 stop7h 54m
Mon 3/294:40 pm -
1 stop5h 40m
Deal found 9/21![Delta logo]()
$379
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 1/82:25 pm -
1 stop8h 15m
Fri 1/151:15 pm -
1 stop5h 55m
Deal found 9/17![United Airlines logo]()
$368
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 11/56:13 am -
1 stop8h 17m
Sun 11/81:15 pm -
1 stop8h 20m
Deal found 9/17![Delta logo]()
$379
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:42 am -
1 stop7h 41m
Thu 10/291:14 pm -
2 stops8h 44m
Deal found 9/17![American Airlines logo]()
$488
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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.
Mon 10/196:10 am -
1 stop6h 45m
Wed 10/218:00 am -
1 stop6h 01m
Deal found 9/21![United Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/273:03 pm -
1 stop7h 13m
Sun 11/18:17 am -
2 stops14h 25m
Deal found 9/17![Delta logo]()
$389
This Orbitz deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/165:30 pm -
2 stops25h 15m
Wed 1/204:15 pm -
2 stops22h 12m
Deal found 9/17![Alaska Airlines logo]()
$543
This United Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 1/52:25 pm -
1 stop8h 08m
Sat 1/94:06 pm -
Nonstop3h 43m
Deal found 9/20![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 1/306:00 am -
2 stops10h 29m
Sat 2/63:30 pm -
1 stop6h 03m
Deal found 9/18![Delta logo]()
$404
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 1/84:59 pm -
1 stop7h 24m
Fri 1/156:00 am -
2 stops12h 42m
Deal found 9/17![American Airlines logo]()
$539
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 1/1612:35 pm -
Nonstop4h 29m
Wed 1/207:30 am -
1 stop6h 20m
Deal found 9/17![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 1/196:00 am -
1 stop7h 40m
Sat 1/2312:00 pm -
2 stops9h 02m
Deal found 9/20![Delta logo]()
$404
This American Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/207:14 am -
1 stop8h 32m
Sat 2/2712:45 pm -
1 stop8h 38m
Deal found 9/20![American Airlines logo]()
$574
This United Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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.
Mon 1/46:05 am -
1 stop7h 14m
Sat 1/911:38 am -
1 stop6h 44m
Deal found 9/20![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/306:00 am -
1 stop8h 30m
Wed 11/41:31 pm -
2 stops7h 45m
Deal found 9/21![Delta logo]()
$404
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 11/188:20 am -
1 stop6h 05m
Wed 11/251:27 pm -
1 stop6h 03m
Deal found 9/18![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 11/23:04 pm -
1 stop7h 12m
Wed 11/41:31 pm -
2 stops7h 45m
Deal found 9/21![Delta logo]()
$404
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:48 am -
2 stops9h 13m
Tue 12/88:00 am -
2 stops10h 54m
Deal found 9/17![American Airlines logo]()
$609
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/215:20 pm -
1 stop6h 43m
Thu 11/268:09 am -
1 stop7h 15m
Deal found 9/19![United Airlines logo]()
$400
This Delta deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/2012:35 pm -
1 stop9h 50m
Tue 12/16:00 am -
1 stop8h 02m
Deal found 9/20![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/172:43 pm -
1 stop7h 47m
Sat 10/241:34 pm -
1 stop5h 37m
Deal found 9/19![United Airlines logo]()
$444
This Delta deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 1/76:40 am -
1 stop6h 55m
Tue 1/121:50 pm -
1 stop8h 30m
Deal found 9/18![Delta logo]()
$492
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/2210:34 pm -
Nonstop3h 56m
Mon 10/266:00 am -
Nonstop3h 19m
Deal found 9/17![United Airlines logo]()
$449
Last-minute flights from Dulles Intl to ColoradoDiscover last-minute flight deals from Dulles Intl to Colorado. Data last updated September 22, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Colorado. Data last updated September 22, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/136:00 am -
1 stop8h 48m
Fri 10/169:19 pm -
1 stop12h 15m
Deal found 9/17![Frontier logo]()
$255
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/136:00 am -
1 stop8h 48m
Wed 10/149:19 pm -
1 stop12h 15m
Deal found 9/17![Frontier logo]()
$259
This Cheapflightsfares deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/1412:30 pm -
1 stop11h 19m
Sun 10/186:56 pm -
1 stop15h 54m
Deal found 9/18![Frontier logo]()
$248
This Mytrip deal was found by Cheapflights users on 9/22. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:50 am -
1 stop15h 41m
Mon 10/199:12 pm -
2 stops18h 01m
Deal found 9/22![Frontier logo]()
$254
This Mytrip deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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.
Fri 10/169:06 pm -
2 stops16h 16m
Mon 10/199:12 pm -
2 stops18h 01m
Deal found 9/20![Frontier logo]()
$251
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/166:00 am -
1 stop19h 43m
Tue 10/207:02 pm -
1 stop13h 15m
Deal found 9/19![Frontier logo]()
$258
This Cheapflightsfares deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/179:06 pm -
1 stop13h 00m
Wed 10/217:31 am -
1 stop20h 49m
Deal found 9/18![Frontier logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:00 am -
1 stop8h 41m
Mon 10/196:30 am -
2 stops32h 43m
Deal found 9/20![Frontier logo]()
$250
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/259:06 pm -
1 stop13h 00m
Wed 10/289:20 pm -
1 stop12h 16m
Deal found 9/17![Frontier logo]()
$257
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:42 am -
1 stop7h 41m
Thu 10/291:14 pm -
1 stop8h 09m
Deal found 9/17![American Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/298:13 am -
1 stop6h 17m
Mon 11/26:00 am -
1 stop6h 09m
Deal found 9/17![Delta logo]()
$333
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/316:00 am -
1 stop8h 21m
Sat 11/78:17 am -
1 stop9h 52m
Deal found 9/17![Delta logo]()
$291
One-way flights from Dulles Intl to ColoradoSearch for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated September 22, 2026.
Search for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated September 22, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 10/199:06 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$122
This Cheapflightsfares deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 11/1211:16 am -
1 stop10h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$124
This Cheapflightsfares deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 10/2811:16 am -
1 stop30h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1012:30 pm -
1 stop11h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/216:00 am -
1 stop8h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 12/410:33 pm -
2 stops25h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/79:06 pm -
2 stops37h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/149:06 pm -
2 stops16h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/159:06 pm -
2 stops26h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$131
This Mytrip deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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.
Tue 10/139:06 pm -
2 stops17h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$132
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/176:00 am -
1 stop10h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$133
This Booking.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/129:06 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$135
Find flight deals from Dulles Intl to Colorado
Keep the following information in mind while searching for Dulles Intl to Colorado flight deals. Data was last updated September 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $248 (Cheapflightsfares) |
One-way from | $122 (Cheapflightsfares) |
Popular in | June |
Cheapest in | January |
Average price | $392 |
Good round-trip deal | $411 or less |
Good one-way deal | $305 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Dulles Intl 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 7,457,451 searches. Data last updated September 22, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Washington, D.C.Colorado Springs
IAD Washington, D.C. Dulles Intl - COS Colorado Springs
IADCOS
Washington, D.C. Dulles Intl
Tue 10/27
5:20 pm-10:03 pm
1 stop6h 43m
Colorado Springs
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
Washington, D.C.Colorado Springs
IAD Washington, D.C. Dulles Intl - COS Colorado Springs
IADCOS
Washington, D.C. Dulles Intl
Tue 10/27
7:23 am-5:27 pm
2 stops12h 04m
Colorado Springs
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$190
Washington, D.C.Montrose
IAD Washington, D.C. Dulles Intl - MTJ Montrose County
IADMTJ
Washington, D.C. Dulles Intl
Mon 10/19
6:42 am-12:23 pm
1 stop7h 41m
Montrose County
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$193
Washington, D.C.Hayden
IAD Washington, D.C. Dulles Intl - HDN Hayden Yampa Valley
IADHDN
Washington, D.C. Dulles Intl
Sat 1/23
6:53 pm-4:45 pm
1 stop23h 52m
Hayden Yampa Valley
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$205
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Sun 11/8
8:20 am-10:29 am
Nonstop4h 09m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$214
Washington, D.C.Colorado Springs
IAD Washington, D.C. Dulles Intl - COS Colorado Springs
IADCOS
Washington, D.C. Dulles Intl
Wed 10/14
10:57 am-8:16 pm
2 stops11h 19m
Colorado Springs
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$220
Washington, D.C.Colorado Springs
IAD Washington, D.C. Dulles Intl - COS Colorado Springs
IADCOS
Washington, D.C. Dulles Intl
Thu 10/22
6:10 am-10:55 am
1 stop6h 45m
Colorado Springs
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$246
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Thu 10/15
6:00 am-11:12 pm
1 stop19h 12m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$251
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Thu 10/8
5:01 am-9:16 am
1 stop6h 15m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$255
Quickest round-trip
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Thu 10/1
6:35 am-8:28 am
Nonstop3h 53m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$259
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Dulles Intl to Colorado
Have a flexible travel schedule? Discover the best time to fly to Colorado from Dulles Intl with our price prediction graph.
IAD-DEN
IAD-COS
IAD-MTJ
IAD-GUC
IAD-DRO
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 Washington, D.C. Dulles Intl Airport to Colorado
IAD-USCO
IAD-DEN
IAD-COS
IAD-MTJ
IAD-GUC
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Colorado?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $338). Flying from Washington, D.C. Dulles Intl Airport to Colorado in July is currently the most expensive (average of $540). 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 IAD to CO?
Find hourly flight availability from Dulles Intl 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 September 22, 2026.
It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Colorado in the evening. Doing so could potentially save you 8% on the flight price compared to flying in the morning, which is usually more expensive.
How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Colorado?
Airfare is below average for this route at the moment.
Washington, D.C. Dulles Intl Airport to Colorado flights typically cost between $338 and $536 in October.The cheapest round-trip price found within the last 5 days was $248 on Frontier (Oct 14-Oct 18).
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Colorado?
To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Colorado, you should look to book at least 43 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Colorado?
Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Colorado. Price data was last updated on September 19, 2026.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Colorado flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday evenings 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 September 22, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from Washington, D.C. Dulles Intl Airport to Colorado to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Dulles Intl 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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Complete your trip
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Dulles Intl and Colorado flights
Browse other Dulles Intl and Colorado flight options. Last updated on September 22, 2026.
Popular flight searches
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Dulles Intl to Colorado flights
Consider these flights traveling from Dulles Intl to Colorado.
Top 6 airlines flying from Dulles Intl to Colorado
Discover the top 6 airlines that operate flights from Dulles Intl 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 7,457,451 searches. Data last updated September 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$80 | Average$282 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$161 | Average$360 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$197 | Average$402 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$218 | Average$540 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$223 | Average$550 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$332 | Average$442 | FlexibilityNo cancel fee | On-time71% |