$89+ Cheap flights from Dulles Intl (IAD) to Colorado
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Mar 14 — Mar 211
1 adult, Economy
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Find cheap flights from Dulles Intl to Colorado 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 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 February 12, 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 February 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/107:00 am
IAD
- DEN
1 stop18h 04m
Frontier
Wed 3/111:09 pm
DEN
- IAD
1 stop9h 22m
Frontier
Deal found 2/10![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 5/56:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Wed 5/131:09 pm
DEN
- IAD
1 stop9h 27m
Frontier
Deal found 2/10![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 5/97:05 am
IAD
- DEN
1 stop7h 04m
Frontier
Sat 5/161:09 pm
DEN
- IAD
1 stop9h 27m
Frontier
Deal found 2/12![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/116:20 am
IAD
- DEN
1 stop18h 44m
Frontier
Tue 3/1711:59 pm
DEN
- IAD
1 stop22h 22m
Frontier
Deal found 2/10![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 5/177:04 pm
IAD
- DEN
1 stop13h 56m
Frontier
Tue 5/191:09 pm
DEN
- IAD
1 stop9h 27m
Frontier
Deal found 2/12![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 4/86:00 am
IAD
- DEN
1 stop8h 09m
Frontier
Tue 4/141:09 pm
DEN
- IAD
1 stop9h 27m
Frontier
Deal found 2/11![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/296:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Mon 5/48:00 am
DEN
- IAD
1 stop8h 19m
Frontier
Deal found 2/12![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/98:09 am
IAD
- DEN
2 stops29h 50m
Frontier
Wed 3/111:09 pm
DEN
- IAD
1 stop9h 22m
Frontier
Deal found 2/10![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/296:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Sun 5/311:59 pm
DEN
- IAD
1 stop6h 57m
Frontier
Deal found 2/12![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 5/126:20 am
IAD
- DEN
2 stops17h 38m
Frontier
Sat 5/161:09 pm
DEN
- IAD
1 stop9h 27m
Frontier
Deal found 2/12![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/179:51 am
IAD
- DEN
1 stop28h 18m
Frontier
Sun 4/2611:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 2/10![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 4/1810:51 am
IAD
- DEN
2 stops14h 15m
Frontier
Tue 4/2111:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 2/9![Frontier logo]()
$156
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 February 12, 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 February 12, 2026.
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/285:15 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
Tue 5/57:50 am
DEN
- IAD
Nonstop3h 31m
United Airlines
Deal found 2/12![United Airlines logo]()
$177
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/185:05 pm
IAD
- DEN
Nonstop4h 00m
Southwest
Tue 4/216:10 pm
DEN
- IAD
Nonstop3h 30m
Southwest
Deal found 2/11![Southwest logo]()
$177
This Delta deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 4/186:00 am
IAD
- DEN
1 stop5h 36m
Delta
Fri 4/2412:55 am
DEN
- IAD
1 stop6h 55m
Delta
Deal found 2/11![Delta logo]()
$227
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/266:00 am
IAD
- MTJ
1 stop9h 56m
American Airlines
Mon 3/22:38 pm
MTJ
- IAD
1 stop6h 15m
American Airlines
Deal found 2/11![American Airlines logo]()
$299
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 5/910:35 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
Sat 5/166:00 am
DEN
- IAD
Nonstop3h 28m
United Airlines
Deal found 2/12![United Airlines logo]()
$177
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:55 pm
IAD
- DEN
Nonstop4h 05m
Southwest
Tue 4/216:10 pm
DEN
- IAD
Nonstop3h 30m
Southwest
Deal found 2/12![Southwest logo]()
$197
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/18:12 pm
IAD
- DEN
Nonstop4h 03m
United Airlines
Wed 4/157:45 am
DEN
- IAD
Nonstop3h 29m
United Airlines
Deal found 2/10![United Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/225:27 pm
IAD
- DEN
1 stop6h 37m
Delta
Thu 4/3012:55 am
DEN
- IAD
1 stop6h 20m
Delta
Deal found 2/12![Delta logo]()
$227
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:05 pm
IAD
- DEN
Nonstop4h 05m
Southwest
Tue 3/106:35 pm
DEN
- IAD
Nonstop3h 05m
Southwest
Deal found 2/10![Southwest logo]()
$217
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/1210:35 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
Wed 4/157:45 am
DEN
- IAD
Nonstop3h 29m
United Airlines
Deal found 2/10![United Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/127:18 am
IAD
- MTJ
1 stop7h 31m
Delta
Tue 3/171:44 pm
MTJ
- IAD
1 stop8h 43m
Delta
Deal found 2/12![Delta logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/1810:30 pm
IAD
- DEN
Nonstop4h 00m
United Airlines
Wed 3/257:45 am
DEN
- IAD
Nonstop3h 20m
United Airlines
Deal found 2/10![United Airlines logo]()
$217
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/217:00 am
IAD
- GJT
1 stop7h 12m
American Airlines
Sat 4/257:20 am
GJT
- IAD
2 stops14h 06m
American Airlines
Deal found 2/12![American Airlines logo]()
$304
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/255:50 am
IAD
- HDN
1 stop8h 05m
Southwest
Mon 3/3011:40 am
HDN
- IAD
1 stop10h 35m
Southwest
Deal found 2/11![Southwest logo]()
$252
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/1610:35 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
Fri 4/246:00 am
DEN
- IAD
Nonstop3h 29m
United Airlines
Deal found 2/10![United Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/217:18 am
IAD
- MTJ
1 stop7h 31m
Delta
Thu 3/261:44 pm
MTJ
- IAD
1 stop8h 43m
Delta
Deal found 2/11![Delta logo]()
$284
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/46:00 am
IAD
- COS
1 stop8h 48m
American Airlines
Sat 3/71:39 pm
COS
- IAD
1 stop7h 14m
American Airlines
Deal found 2/10![American Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/2410:30 pm
IAD
- DEN
Nonstop4h 02m
United Airlines
Sat 3/2811:59 pm
DEN
- IAD
Nonstop3h 18m
United Airlines
Deal found 2/12![United Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/247:15 am
IAD
- HDN
1 stop7h 29m
Delta
Thu 2/261:49 pm
HDN
- IAD
1 stop8h 32m
Delta
Deal found 2/10![Delta logo]()
$287
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 3/26:00 am
IAD
- ASE
1 stop10h 17m
American Airlines
Mon 3/92:47 pm
ASE
- IAD
1 stop6h 06m
American Airlines
Deal found 2/9![American Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/138:26 am
IAD
- MTJ
1 stop7h 34m
United Airlines
Tue 3/173:39 pm
MTJ
- IAD
1 stop5h 41m
United Airlines
Deal found 2/11![United Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 5/136:20 am
IAD
- COS
1 stop5h 25m
Southwest
Wed 5/204:05 pm
COS
- IAD
1 stop5h 35m
Southwest
Deal found 2/12![Southwest logo]()
$341
This Delta deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/237:15 am
IAD
- HDN
1 stop7h 29m
Delta
Thu 2/261:49 pm
HDN
- IAD
1 stop8h 32m
Delta
Deal found 2/10![Delta logo]()
$327
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 2/195:00 am
IAD
- HDN
2 stops9h 33m
American Airlines
Mon 2/231:23 pm
HDN
- IAD
1 stop7h 30m
American Airlines
Deal found 2/11![American Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 2/237:15 am
IAD
- HDN
1 stop7h 29m
Delta
Wed 2/251:49 pm
HDN
- IAD
1 stop8h 32m
Delta
Deal found 2/10![Delta logo]()
$327
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/145:59 pm
IAD
- COS
1 stop6h 26m
American Airlines
Fri 4/171:39 pm
COS
- IAD
1 stop7h 47m
American Airlines
Deal found 2/10![American Airlines logo]()
$362
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/225:05 am
IAD
- COS
1 stop6h 20m
Southwest
Tue 3/244:15 pm
COS
- IAD
1 stop5h 25m
Southwest
Deal found 2/11![Southwest logo]()
$364
This Delta deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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.
Sun 2/226:00 am
IAD
- HDN
1 stop8h 44m
Delta
Tue 3/31:49 pm
HDN
- IAD
1 stop8h 32m
Delta
Deal found 2/10![Delta logo]()
$327
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/214:00 pm
IAD
- GJT
1 stop6h 59m
United Airlines
Sat 4/251:43 pm
GJT
- IAD
1 stop5h 42m
United Airlines
Deal found 2/12![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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 3/116:00 am
IAD
- ASE
1 stop8h 09m
American Airlines
Wed 3/182:47 pm
ASE
- IAD
1 stop6h 06m
American Airlines
Deal found 2/8![American Airlines logo]()
$389
Last-minute flights from Dulles Intl to ColoradoDiscover last-minute flight deals from Dulles Intl to Colorado. Data last updated February 12, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Colorado. Data last updated February 12, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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.
Thu 2/268:07 pm
IAD
- DEN
1 stop20h 55m
Frontier
Wed 3/46:20 pm
DEN
- IAD
1 stop13h 05m
Frontier
Deal found 2/11![Frontier logo]()
$169
This Expedia deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2810:29 am
IAD
- DEN
1 stop13h 06m
Frontier
Wed 3/46:20 pm
DEN
- IAD
1 stop13h 05m
Frontier
Deal found 2/10![Frontier logo]()
$159
This Orbitz deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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.
Mon 3/27:05 pm
IAD
- DEN
1 stop16h 06m
Frontier
Wed 3/46:20 pm
DEN
- IAD
1 stop13h 05m
Frontier
Deal found 2/10![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/75:05 am
IAD
- DEN
2 stops17h 25m
Frontier
Wed 3/111:09 pm
DEN
- IAD
1 stop9h 22m
Frontier
Deal found 2/10![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/86:25 am
IAD
- DEN
1 stop18h 39m
Frontier
Wed 3/111:09 pm
DEN
- IAD
1 stop9h 22m
Frontier
Deal found 2/10![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/98:09 am
IAD
- DEN
2 stops29h 50m
Frontier
Wed 3/111:09 pm
DEN
- IAD
1 stop9h 22m
Frontier
Deal found 2/10![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/107:00 am
IAD
- DEN
1 stop18h 04m
Frontier
Wed 3/111:09 pm
DEN
- IAD
1 stop9h 22m
Frontier
Deal found 2/10![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/107:00 am
IAD
- DEN
1 stop18h 04m
Frontier
Mon 3/1611:59 pm
DEN
- IAD
1 stop21h 57m
Frontier
Deal found 2/10![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/116:20 am
IAD
- DEN
1 stop18h 44m
Frontier
Tue 3/1711:59 pm
DEN
- IAD
1 stop22h 22m
Frontier
Deal found 2/10![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” 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 3/116:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Wed 3/186:35 am
DEN
- IAD
2 stops15h 46m
Frontier
Deal found 2/9![Frontier logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/116:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Wed 3/1111:59 pm
DEN
- IAD
1 stop22h 32m
Frontier
Deal found 2/10![Frontier logo]()
$173
This Delta deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/127:18 am
IAD
- MTJ
1 stop7h 31m
Delta
Tue 3/171:44 pm
MTJ
- IAD
1 stop8h 43m
Delta
Deal found 2/12![Delta logo]()
$249
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 February 12, 2026.
Search for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated February 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 4/196:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Deal found 2/11![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 5/46:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Deal found 2/11![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/107:00 am
IAD
- DEN
2 stops26h 13m
Frontier
Deal found 2/12![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/96:20 am
IAD
- DEN
2 stops26h 53m
Frontier
Deal found 2/10![Frontier logo]()
$93
This Super.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/186:20 am
IAD
- DEN
1 stop7h 49m
Frontier
Deal found 2/10![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/126:00 am
IAD
- DEN
1 stop8h 09m
Frontier
Deal found 2/10![Frontier logo]()
$95
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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.
Wed 4/226:20 am
IAD
- DEN
1 stop18h 43m
Frontier
Deal found 2/12![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/1810:51 am
IAD
- DEN
2 stops14h 15m
Frontier
Deal found 2/10![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 3/88:09 am
IAD
- DEN
2 stops49h 04m
Frontier
Deal found 2/10![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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.
Thu 2/268:07 pm
IAD
- DEN
1 stop20h 55m
Frontier
Deal found 2/10![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” 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 4/138:30 pm
IAD
- DEN
2 stops23h 10m
Frontier
Deal found 2/10![Frontier logo]()
$100
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” 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 3/46:00 am
IAD
- HDN
1 stop8h 33m
American Airlines
Deal found 2/11![American Airlines logo]()
$139
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 February 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $117 (Kiwi.com) |
One-way from | $89 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $255 |
Good round-trip deal | $342 or less |
Good one-way deal | $196 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 2,558,603 searches. Data last updated February 12, 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
Dulles Intl
Fly to
Colorado
Route
Depart
Return
Price
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Tue 4/28
5:15 pm-7:24 pm
Nonstop4h 09m
Denver Intl
Tue 5/5
7:50 am-1:21 pm
Nonstop3h 31m
$177
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Sat 4/18
5:05 pm-7:05 pm
Nonstop4h 00m
Denver Intl
Tue 4/21
6:10 pm-11:40 pm
Nonstop3h 30m
$177
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Sat 5/9
10:35 pm-12:44 am
Nonstop4h 09m
Denver Intl
Sat 5/16
6:00 am-11:28 am
Nonstop3h 28m
$177
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Fri 4/17
5:55 pm-8:00 pm
Nonstop4h 05m
Denver Intl
Tue 4/21
6:10 pm-11:40 pm
Nonstop3h 30m
$197
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 4/1
8:12 pm-10:15 pm
Nonstop4h 03m
Denver Intl
Wed 4/15
7:45 am-1:14 pm
Nonstop3h 29m
$197
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Sat 3/7
6:05 pm-8:10 pm
Nonstop4h 05m
Denver Intl
Tue 3/10
6:35 pm-11:40 pm
Nonstop3h 05m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Sun 4/12
10:35 pm-12:44 am
Nonstop4h 09m
Denver Intl
Wed 4/15
7:45 am-1:14 pm
Nonstop3h 29m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 3/18
10:30 pm-12:30 am
Nonstop4h 00m
Denver Intl
Wed 3/25
7:45 am-1:05 pm
Nonstop3h 20m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Thu 4/16
10:35 pm-12:44 am
Nonstop4h 09m
Denver Intl
Fri 4/24
6:00 am-11:29 am
Nonstop3h 29m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Sat 4/18
6:00 am-9:36 am
1 stop5h 36m
Denver Intl
Fri 4/24
12:55 am-9:50 am
1 stop6h 55m
$227
Showing 1-10 of 60 results
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-MTJ
IAD-GJT
IAD-HDN
IAD-COS
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-MTJ
IAD-GJT
IAD-HDN
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 $133). Flying from Washington, D.C. Dulles Intl Airport to Colorado in April is currently the most expensive (average of $243). 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 February 12, 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 25% on the flight price compared to flying in the morning, which is usually more expensive.
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 February 7, 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. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Washington, D.C. Dulles Intl Airport to Colorado
Explore weekly flight availability from Dulles Intl to Colorado. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 12, 2026.
The most flights from IAD to USCO are scheduled on a Thursday (24 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (10 on average).
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 February 12, 2026.
Peruse reviews from past customers who have flown with Southwest, Delta, and United 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.
Entertainment
7.5
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from 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 February 12, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Dulles Intl to Colorado flights
Consider these flights traveling from Dulles Intl to Colorado.
Top 5 airlines flying from Dulles Intl to Colorado
Discover the top 5 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 2,558,603 searches. Data last updated February 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$82 | Average$248 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$160 | Average$395 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$177 | Average$333 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$214 | Average$472 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$236 | Average$277 | FlexibilityNo cancel fee | On-timeN/A |