$123+ Cheap flights from Colorado to Dulles Intl (IAD)
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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
Oct 24 — Oct 311
Round-trip
1 adult, Economy
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Find cheap flights from Colorado to Dulles Intl 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
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Cheapest flights from Colorado to Dulles IntlExplore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 24, 2026.
Explore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 24, 2026.
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.
Mon 10/198:45 pm -
1 stop7h 35m
Mon 11/29:06 pm -
1 stop13h 16m
Deal found 9/19![Frontier logo]()
$242
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:30 am -
2 stops15h 13m
Tue 11/39:06 pm -
2 stops20h 47m
Deal found 9/19![Frontier logo]()
$243
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.
Tue 10/139:12 pm -
2 stops18h 01m
Mon 10/199:06 pm -
1 stop26h 25m
Deal found 9/20![Frontier logo]()
$244
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.
Thu 10/296:30 am -
2 stops15h 13m
Mon 11/27:40 am -
2 stops15h 50m
Deal found 9/20![Frontier logo]()
$245
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.
Thu 10/226:56 pm -
1 stop15h 54m
Sat 10/2412:30 pm -
1 stop11h 19m
Deal found 9/19![Frontier logo]()
$246
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:42 pm -
1 stop9h 38m
Tue 10/209:06 pm -
1 stop13h 00m
Deal found 9/19![Frontier logo]()
$247
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.
Mon 10/198:45 pm -
1 stop7h 35m
Fri 10/309:06 pm -
1 stop13h 16m
Deal found 9/19![Frontier logo]()
$248
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 10/167:02 pm -
1 stop13h 15m
Sat 10/2412:30 pm -
1 stop11h 19m
Deal found 9/19![Frontier logo]()
$249
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.
Wed 10/217:31 am -
1 stop20h 49m
Sun 10/259:06 pm -
1 stop13h 00m
Deal found 9/19![Frontier logo]()
$250
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:31 am -
1 stop20h 49m
Wed 10/219:06 pm -
2 stops20h 48m
Deal found 9/21![Frontier logo]()
$251
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.
Wed 11/1810:43 am -
1 stop11h 00m
Mon 11/302:15 pm -
1 stop19h 54m
Deal found 9/19![Frontier logo]()
$252
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:19 pm -
1 stop12h 15m
Wed 10/216:00 am -
1 stop8h 48m
Deal found 9/22![Frontier logo]()
$253
Best flights from Colorado to Dulles IntlDiscover carefully curated flight deals from Colorado to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 24, 2026.
Discover carefully curated flight deals from Colorado to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 24, 2026.
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Fri 10/166:00 am -
Nonstop3h 25m
Sun 10/256:10 am -
Nonstop4h 09m
Deal found 9/23![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 9/23. 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 11/106:00 am -
1 stop5h 54m
Thu 11/128:05 am -
1 stop6h 21m
Deal found 9/23![Delta logo]()
$369
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.
Tue 10/201:14 pm -
1 stop8h 09m
Thu 10/226:42 am -
1 stop7h 41m
Deal found 9/20![American Airlines logo]()
$485
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/68:20 am -
2 stops19h 24m
Sun 11/87:05 am -
1 stop12h 34m
Deal found 9/20![Alaska Airlines logo]()
$575
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.
Thu 10/296:00 am -
Nonstop3h 19m
Sat 10/3110:10 pm -
Nonstop4h 09m
Deal found 9/19![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 11/26:00 am -
1 stop6h 09m
Tue 11/38:13 am -
1 stop6h 17m
Deal found 9/21![Delta logo]()
$369
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/43:20 pm -
1 stop5h 55m
Sat 11/712:40 pm -
1 stop6h 27m
Deal found 9/22![United Airlines logo]()
$368
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 11/26:07 pm -
2 stops14h 03m
Thu 11/56:00 am -
1 stop8h 30m
Deal found 9/21![Delta logo]()
$374
This Delta deal was found by Cheapflights users on 9/23. 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.
Wed 10/146:35 am -
1 stop8h 58m
Fri 10/2312:27 pm -
1 stop7h 25m
Deal found 9/23![Delta logo]()
$379
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:30 am -
1 stop8h 49m
Thu 11/122:42 pm -
1 stop7h 35m
Deal found 9/21![American Airlines logo]()
$491
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/41:31 pm -
2 stops7h 45m
Tue 11/1012:32 pm -
2 stops11h 50m
Deal found 9/19![Delta logo]()
$380
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/105:56 pm -
Nonstop3h 29m
Tue 10/1310:34 pm -
Nonstop3h 56m
Deal found 9/23![United Airlines logo]()
$419
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.
Wed 11/412:58 pm -
2 stops18h 05m
Sat 11/77:00 am -
2 stops13h 08m
Deal found 9/22![American Airlines logo]()
$539
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.
Tue 10/277:30 am -
2 stops13h 46m
Tue 11/36:00 am -
1 stop7h 24m
Deal found 9/21![Delta logo]()
$410
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.
Thu 12/244:09 pm -
Nonstop3h 21m
Fri 12/257:30 pm -
Nonstop4h 03m
Deal found 9/19![United Airlines logo]()
$469
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:45 am -
2 stops17h 55m
Fri 10/235:33 pm -
2 stops19h 59m
Deal found 9/19![Alaska Airlines logo]()
$651
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:48 pm -
2 stops12h 11m
Wed 12/27:14 am -
1 stop7h 33m
Deal found 9/21![American Airlines logo]()
$545
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/2410:25 am -
1 stop8h 46m
Wed 10/282:05 pm -
1 stop8h 31m
Deal found 9/23![United Airlines logo]()
$488
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.
Wed 10/216:59 pm -
2 stops27h 00m
Sun 10/257:02 am -
2 stops18h 57m
Deal found 9/21![Alaska Airlines logo]()
$663
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 10/201:15 pm -
1 stop8h 10m
Wed 10/288:20 am -
1 stop6h 28m
Deal found 9/20![United Airlines logo]()
$492
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 10/207:30 am -
2 stops13h 46m
Wed 10/286:00 am -
1 stop7h 21m
Deal found 9/20![Delta logo]()
$497
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.
Fri 10/163:23 pm -
1 stop6h 02m
Wed 10/212:43 pm -
1 stop7h 54m
Deal found 9/19![United Airlines logo]()
$496
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.
Thu 11/57:30 am -
2 stops13h 46m
Thu 11/126:00 am -
1 stop7h 43m
Deal found 9/21![Delta logo]()
$524
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.
Sun 10/46:00 am -
Nonstop3h 25m
Sun 10/116:35 am -
Nonstop3h 53m
Deal found 9/19![United Airlines logo]()
$499
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/243:15 pm -
1 stop6h 10m
Tue 10/274:10 pm -
1 stop6h 24m
Deal found 9/22![United Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/711:23 am -
1 stop6h 07m
Wed 11/112:05 pm -
1 stop8h 32m
Deal found 9/23![United Airlines logo]()
$499
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.
Sat 11/149:35 am -
1 stop9h 42m
Mon 11/1610:10 pm -
Nonstop4h 09m
Deal found 9/20![United Airlines logo]()
$505
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 1/234:06 pm -
Nonstop3h 43m
Tue 1/2610:22 am -
1 stop6h 16m
Deal found 9/19![United Airlines logo]()
$509
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/301:40 pm -
1 stop7h 35m
Tue 11/34:10 pm -
1 stop6h 20m
Deal found 9/22![United Airlines logo]()
$513
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.
Wed 10/141:37 pm -
1 stop7h 48m
Sun 10/186:35 am -
1 stop8h 00m
Deal found 9/19![United Airlines logo]()
$552
Last-minute flights from Colorado to Dulles IntlDiscover last-minute flight deals from Colorado to Dulles Intl. Data last updated September 24, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Dulles Intl. Data last updated September 24, 2026 and is based on user searches.
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:42 pm -
1 stop9h 38m
Tue 10/209:06 pm -
1 stop13h 00m
Deal found 9/19![Frontier logo]()
$247
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.
Tue 10/139:12 pm -
2 stops18h 01m
Mon 10/199:06 pm -
1 stop26h 25m
Deal found 9/20![Frontier logo]()
$244
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:31 am -
1 stop20h 49m
Wed 10/219:06 pm -
2 stops20h 48m
Deal found 9/21![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 10/167:02 pm -
1 stop13h 15m
Sat 10/2412:30 pm -
1 stop11h 19m
Deal found 9/19![Frontier logo]()
$249
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.
Mon 10/198:45 pm -
1 stop7h 35m
Mon 11/29:06 pm -
1 stop13h 16m
Deal found 9/19![Frontier logo]()
$242
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.
Mon 10/198:45 pm -
1 stop7h 35m
Fri 10/309:06 pm -
1 stop13h 16m
Deal found 9/19![Frontier logo]()
$248
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:19 pm -
1 stop12h 15m
Wed 10/216:00 am -
1 stop8h 48m
Deal found 9/22![Frontier logo]()
$253
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.
Wed 10/217:31 am -
1 stop20h 49m
Sun 10/259:06 pm -
1 stop13h 00m
Deal found 9/19![Frontier logo]()
$250
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.
Thu 10/226:56 pm -
1 stop15h 54m
Sat 10/2412:30 pm -
1 stop11h 19m
Deal found 9/19![Frontier logo]()
$246
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:10 am -
2 stops15h 33m
Thu 10/297:40 am -
2 stops26h 40m
Deal found 9/18![Frontier logo]()
$252
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:30 am -
2 stops15h 13m
Tue 11/39:06 pm -
2 stops20h 47m
Deal found 9/19![Frontier logo]()
$243
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.
Thu 10/296:30 am -
2 stops15h 13m
Mon 11/27:40 am -
2 stops15h 50m
Deal found 9/20![Frontier logo]()
$245
One-way flights from Colorado to Dulles IntlSearch for one-way flight options from Colorado to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 24, 2026.
Search for one-way flight options from Colorado to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 24, 2026.
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 10/229:19 pm -
2 stops41h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$123
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 10/266:40 am -
1 stop25h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 12/29:59 pm -
2 stops38h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$127
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:21 pm -
2 stops10h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$132
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.
Sat 10/176:42 pm -
1 stop9h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$133
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:42 pm -
1 stop9h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$135
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:20 am -
1 stop12h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$136
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.
Wed 10/1410:41 am -
2 stops28h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$137
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/38:40 am -
1 stop7h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![United Airlines logo]()
$185
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/38:17 am -
2 stops12h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Delta logo]()
$190
This 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/43:08 pm -
1 stop7h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Delta logo]()
$201
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 1/134:22 pm -
1 stop6h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![United Airlines logo]()
$203
Find flight deals from Colorado to Dulles Intl
Keep the following information in mind while searching for Colorado to Dulles Intl flight deals. Data was last updated September 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $242 (Kiwi.com) |
One-way from | $123 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $362 |
Good round-trip deal | $436 or less |
Good one-way deal | $315 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Colorado to Dulles Intl 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 24, 2026.
Use the filters below to find and compare flights from Colorado to Washington, D.C. Dulles Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Colorado SpringsWashington, D.C.
COS Colorado Springs - IAD Washington, D.C. Dulles Intl
COSIAD
Colorado Springs
Wed 11/11
6:00 am-1:54 pm
1 stop5h 54m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$185
Colorado SpringsWashington, D.C.
COS Colorado Springs - IAD Washington, D.C. Dulles Intl
COSIAD
Colorado Springs
Wed 11/4
1:31 pm-11:16 pm
2 stops7h 45m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$190
Colorado SpringsWashington, D.C.
COS Colorado Springs - IAD Washington, D.C. Dulles Intl
COSIAD
Colorado Springs
Mon 11/9
6:08 pm-9:09 am
2 stops13h 01m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$190
Colorado SpringsWashington, D.C.
COS Colorado Springs - IAD Washington, D.C. Dulles Intl
COSIAD
Colorado Springs
Tue 11/3
8:17 am-11:16 pm
2 stops12h 59m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$190
DenverWashington, D.C.
DEN Denver Intl - IAD Washington, D.C. Dulles Intl
DENIAD
Denver Intl
Sat 10/17
1:58 pm-7:26 pm
Nonstop3h 28m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$214
Colorado SpringsWashington, D.C.
COS Colorado Springs - IAD Washington, D.C. Dulles Intl
COSIAD
Colorado Springs
Fri 10/30
8:09 am-4:33 pm
1 stop6h 24m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$215
DenverWashington, D.C.
DEN Denver Intl - IAD Washington, D.C. Dulles Intl
DENIAD
Denver Intl
Mon 10/12
6:40 pm-10:38 am
1 stop13h 58m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$248
AspenWashington, D.C.
ASE Aspen Pitkin County - IAD Washington, D.C. Dulles Intl
ASEIAD
Aspen Pitkin County
Thu 12/31
1:00 pm-11:21 pm
1 stop8h 21m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$263
MontroseWashington, D.C.
MTJ Montrose County - IAD Washington, D.C. Dulles Intl
MTJIAD
Montrose County
Wed 10/14
1:37 pm-11:25 pm
1 stop7h 48m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$265
Quickest round-trip
DenverWashington, D.C.
DEN Denver Intl - IAD Washington, D.C. Dulles Intl
DENIAD
Denver Intl
Sat 3/13
11:50 pm-5:08 am
Nonstop3h 18m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$269
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Colorado to Dulles Intl
Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Colorado with our price prediction graph.
COS-IAD
DEN-IAD
MTJ-IAD
GJT-IAD
HDN-IAD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Colorado to Washington, D.C. Dulles Intl Airport
USCO-IAD
COS-IAD
DEN-IAD
MTJ-IAD
GJT-IAD
What is the cheapest month to book a flight from Colorado to Washington, D.C. Dulles Intl Airport?
Currently, January is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $348). Flying from Colorado to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $557). 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 IAD?
Find hourly flight availability from Colorado to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 24, 2026.
One of the essential ways to save on airfare from Colorado to Washington, D.C. Dulles Intl Airport is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 29% on airfare.
Weekly flight availability from Colorado to Washington, D.C. Dulles Intl Airport
Explore weekly flight availability from Colorado to Dulles Intl. 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 September 24, 2026.
The most flights from USCO to IAD are scheduled on a Monday (23 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Colorado to Washington, D.C. Dulles Intl Airport?
Airfare is below average for this route at the moment.
Colorado to Washington, D.C. Dulles Intl Airport flights typically cost between $334 and $572 in October.The cheapest round-trip price found within the last 5 days was $242 on Frontier (Oct 19-Nov 2).
How far ahead should I book a flight from Colorado to Washington, D.C. Dulles Intl Airport?
Booking 83 days in advance of your planned departure date is, on average, the best time to get cheap flights from Colorado to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Colorado to Washington, D.C. Dulles Intl Airport?
Use this chart to determine the cheapest time to fly round-trip from Colorado to Dulles Intl. Price data was last updated on September 19, 2026.
Travelers seeking maximum savings on their Colorado to Washington, D.C. Dulles Intl Airport flight should consider departing on Saturday afternoons when fares are most often at their lowest. Saturday at noon 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 Dulles Intl. 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 Washington, D.C. Dulles Intl Airport?
Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locationsAlexandria
Arlington
Owings Mills
Lanham
Tysons
Chantilly
Woodbridge
Reston
Herndon
Hyattsville
Rockville
Fredericksburg
Falls Church
Sterling
Hanover
Laurel
Springfield
Oxon Hill
Clinton
Hunt Valley
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Colorado and Dulles Intl flights
Browse other Colorado and Dulles Intl flight options. Last updated on September 24, 2026.
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Consider these flights traveling from Colorado to Dulles Intl.
Top 4 airlines flying from Colorado to Dulles Intl
Discover the top 4 airlines that operate flights from Colorado to Dulles Intl. 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 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$308 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$197 | Average$373 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$233 | Average$492 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$292 | Average$530 | FlexibilityNo cancel fee | On-timeN/A |