$94+ 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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
apr. 13 — apr. 201
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 marts 14, 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 marts 14, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/11. 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.
lør. 5/210:51 am
IAD
- DEN
1 stop13h 38m
Frontier
tir. 5/511:54 pm
DEN
- IAD
1 stop8h 18m
Frontier
Deal found 3/11![Frontier logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 3/11. 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.
man. 5/47:43 pm
IAD
- DEN
1 stop20h 21m
Frontier
tir. 5/511:54 pm
DEN
- IAD
1 stop8h 18m
Frontier
Deal found 3/11![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 4/63:25 pm
IAD
- DEN
1 stop20h 15m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/8![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
lør. 4/1810:51 am
IAD
- DEN
1 stop13h 38m
Frontier
lør. 4/2511:59 pm
DEN
- IAD
1 stop6h 57m
Frontier
Deal found 3/10![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
man. 4/1310:25 pm
IAD
- DEN
1 stop26h 04m
Frontier
ons. 4/1511:59 pm
DEN
- IAD
1 stop6h 57m
Frontier
Deal found 3/9![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
ons. 4/86:00 am
IAD
- DEN
1 stop8h 09m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/9![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
ons. 4/296:20 am
IAD
- DEN
1 stop18h 09m
Frontier
tir. 5/511:54 pm
DEN
- IAD
1 stop15h 33m
Frontier
Deal found 3/12![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 3/11. 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.
man. 5/47:43 pm
IAD
- DEN
1 stop20h 21m
Frontier
ons. 5/66:30 am
DEN
- IAD
1 stop8h 57m
Frontier
Deal found 3/11![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
tir. 4/76:00 am
IAD
- DEN
2 stops29h 40m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/9![Frontier logo]()
$174
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 5/286:30 am
IAD
- MTJ
1 stop8h 14m
United Airlines
man. 6/13:25 pm
MTJ
- IAD
1 stop7h 20m
United Airlines
Deal found 3/9![United Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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.
tor. 4/307:00 am
IAD
- MTJ
1 stop6h 58m
American Airlines
søn. 5/312:42 pm
MTJ
- IAD
1 stop8h 44m
American Airlines
Deal found 3/14![American Airlines logo]()
$289
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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.
lør. 5/92:37 pm
IAD
- MTJ
1 stop7h 41m
United Airlines
lør. 5/161:43 pm
MTJ
- IAD
1 stop5h 37m
United Airlines
Deal found 3/13![United Airlines logo]()
$309
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 marts 14, 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 marts 14, 2026.
This Delta deal was found by Cheapflights users on 3/10. 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.
fre. 4/176:37 pm
IAD
- DEN
1 stop6h 42m
Delta
tir. 4/216:10 am
DEN
- IAD
1 stop8h 05m
Delta
Deal found 3/10![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 4/1310:35 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
søn. 4/1911:59 pm
DEN
- IAD
Nonstop3h 29m
United Airlines
Deal found 3/8![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 3/11. 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.
man. 4/135:55 pm
IAD
- DEN
Nonstop4h 05m
Southwest
tir. 4/146:10 pm
DEN
- IAD
Nonstop3h 30m
Southwest
Deal found 3/11![Southwest logo]()
$257
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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.
tor. 4/307:00 am
IAD
- MTJ
1 stop6h 58m
American Airlines
søn. 5/312:42 pm
MTJ
- IAD
1 stop8h 44m
American Airlines
Deal found 3/14![American Airlines logo]()
$289
This Alaska Airlines deal was found by Cheapflights users on 3/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tir. 4/287:10 am
IAD
- DEN
2 stops18h 49m
Alaska Airlines
man. 5/46:00 am
DEN
- IAD
1 stop16h 09m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 3/10. 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.
fre. 5/15:55 am
IAD
- DEN
Nonstop3h 50m
Southwest
søn. 5/108:25 am
DEN
- IAD
1 stop7h 00m
Southwest
Deal found 3/10![Southwest logo]()
$283
This United Airlines deal was found by Cheapflights users on 3/12. 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.
tir. 5/55:20 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
lør. 5/97:50 am
DEN
- IAD
Nonstop3h 31m
United Airlines
Deal found 3/12![United Airlines logo]()
$297
This American Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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.
tor. 4/97:00 am
IAD
- DRO
1 stop7h 11m
American Airlines
tir. 4/1412:41 pm
DRO
- IAD
1 stop8h 45m
American Airlines
Deal found 3/13![American Airlines logo]()
$338
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 4/3010:35 pm
IAD
- DEN
Nonstop4h 09m
United Airlines
søn. 5/311:59 pm
DEN
- IAD
Nonstop3h 29m
United Airlines
Deal found 3/9![United Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 3/12. 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.
ons. 4/153:00 pm
IAD
- COS
1 stop7h 20m
Delta
tir. 4/281:14 pm
COS
- IAD
1 stop5h 38m
Delta
Deal found 3/12![Delta logo]()
$371
This American Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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.
tir. 5/57:00 am
IAD
- DRO
1 stop7h 11m
American Airlines
tir. 5/128:40 am
DRO
- IAD
2 stops12h 46m
American Airlines
Deal found 3/13![American Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 3/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tir. 4/216:20 am
IAD
- COS
2 stops11h 50m
Southwest
ons. 4/224:05 pm
COS
- IAD
1 stop5h 35m
Southwest
Deal found 3/9![Southwest logo]()
$352
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 4/176:22 pm
IAD
- DEN
1 stop25h 02m
Alaska Airlines
ons. 4/228:00 am
DEN
- IAD
2 stops31h 41m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$398
This United Airlines deal was found by Cheapflights users on 3/10. 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.
tor. 5/72:37 pm
IAD
- GJT
1 stop8h 07m
United Airlines
søn. 5/105:30 am
GJT
- IAD
1 stop5h 51m
United Airlines
Deal found 3/10![United Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 3/12. 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.
fre. 4/172:21 pm
IAD
- GJT
1 stop8h 38m
United Airlines
lør. 4/257:01 am
GJT
- IAD
1 stop6h 45m
United Airlines
Deal found 3/12![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 3/10. 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.
fre. 4/105:55 am
IAD
- DEN
Nonstop3h 50m
Southwest
man. 4/136:40 am
DEN
- IAD
1 stop8h 25m
Southwest
Deal found 3/10![Southwest logo]()
$387
This Delta deal was found by Cheapflights users on 3/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 6/15:33 pm
IAD
- COS
1 stop5h 54m
Delta
lør. 6/66:00 am
COS
- IAD
1 stop6h 13m
Delta
Deal found 3/9![Delta logo]()
$439
This United Airlines deal was found by Cheapflights users on 3/11. 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.
man. 7/612:48 pm
IAD
- ASE
1 stop7h 41m
United Airlines
lør. 7/115:10 pm
ASE
- IAD
1 stop5h 35m
United Airlines
Deal found 3/11![United Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 3/10. 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.
lør. 5/233:55 pm
IAD
- DEN
1 stop8h 20m
Southwest
tir. 5/266:10 pm
DEN
- IAD
Nonstop3h 30m
Southwest
Deal found 3/10![Southwest logo]()
$400
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 5/296:10 am
IAD
- MTJ
1 stop7h 33m
United Airlines
tir. 6/21:40 pm
MTJ
- IAD
1 stop7h 52m
United Airlines
Deal found 3/9![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 3/11. 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.
tor. 5/284:30 pm
IAD
- COS
1 stop9h 35m
Southwest
søn. 5/315:05 pm
COS
- IAD
1 stop5h 35m
Southwest
Deal found 3/11![Southwest logo]()
$407
This United Airlines deal was found by Cheapflights users on 3/11. 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.
lør. 4/185:20 pm
IAD
- COS
1 stop6h 37m
United Airlines
tor. 4/2310:28 am
COS
- IAD
1 stop6h 32m
United Airlines
Deal found 3/11![United Airlines logo]()
$367
This American Airlines deal was found by Cheapflights users on 3/10. 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.
man. 9/76:27 am
IAD
- ASE
1 stop9h 33m
American Airlines
fre. 9/1112:32 pm
ASE
- IAD
1 stop7h 56m
American Airlines
Deal found 3/10![American Airlines logo]()
$541
This Southwest deal was found by Cheapflights users on 3/10. 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.
søn. 4/124:25 pm
IAD
- COS
1 stop9h 25m
Southwest
tor. 4/165:20 pm
COS
- IAD
1 stop5h 00m
Southwest
Deal found 3/10![Southwest logo]()
$432
This Delta deal was found by Cheapflights users on 3/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ons. 4/157:20 am
IAD
- GJT
1 stop11h 26m
Delta
fre. 4/247:45 am
GJT
- IAD
2 stops13h 18m
Delta
Deal found 3/9![Delta logo]()
$591
This United Airlines deal was found by Cheapflights users on 3/12. 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.
lør. 4/115:20 pm
IAD
- COS
1 stop6h 37m
United Airlines
lør. 4/1811:42 am
COS
- IAD
1 stop5h 41m
United Airlines
Deal found 3/12![United Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 3/12. 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.
søn. 6/74:45 pm
IAD
- COS
1 stop9h 50m
Southwest
fre. 6/124:55 pm
COS
- IAD
1 stop5h 35m
Southwest
Deal found 3/12![Southwest logo]()
$447
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tir. 4/142:21 pm
IAD
- MTJ
1 stop7h 59m
United Airlines
lør. 4/181:40 pm
MTJ
- IAD
1 stop5h 45m
United Airlines
Deal found 3/9![United Airlines logo]()
$379
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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.
fre. 4/177:00 am
IAD
- ASE
1 stop8h 05m
American Airlines
søn. 4/191:07 pm
ASE
- IAD
1 stop8h 19m
American Airlines
Deal found 3/14![American Airlines logo]()
$641
This United Airlines deal was found by Cheapflights users on 3/11. 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.
tor. 5/288:15 am
IAD
- HDN
1 stop6h 09m
United Airlines
tir. 6/23:20 pm
HDN
- IAD
1 stop6h 12m
United Airlines
Deal found 3/11![United Airlines logo]()
$383
Last-minute flights from Dulles Intl to ColoradoDiscover last-minute flight deals from Dulles Intl to Colorado. Data last updated marts 14, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Colorado. Data last updated marts 14, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 4/63:25 pm
IAD
- DEN
1 stop20h 15m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/8![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 4/63:25 pm
IAD
- DEN
1 stop20h 15m
Frontier
ons. 4/1511:59 pm
DEN
- IAD
1 stop6h 57m
Frontier
Deal found 3/8![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
tir. 4/76:00 am
IAD
- DEN
2 stops29h 40m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/9![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
ons. 4/86:00 am
IAD
- DEN
1 stop8h 09m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/9![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
tor. 4/910:13 pm
IAD
- DEN
1 stop12h 14m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/10![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
søn. 4/124:01 pm
IAD
- COS
1 stop19h 48m
Multiple Airlines
fre. 4/1710:39 am
COS
- IAD
2 stops44h 17m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
man. 4/1310:25 pm
IAD
- DEN
1 stop26h 04m
Frontier
ons. 4/1511:59 pm
DEN
- IAD
1 stop6h 57m
Frontier
Deal found 3/9![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 3/11. 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.
man. 4/138:30 pm
IAD
- DEN
1 stop20h 01m
Frontier
tir. 4/1411:59 pm
DEN
- IAD
1 stop22h 37m
Frontier
Deal found 3/11![Frontier logo]()
$180
This American Airlines deal was found by Cheapflights users on 3/10. 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.
ons. 4/157:00 am
IAD
- MTJ
1 stop6h 58m
American Airlines
søn. 4/1912:42 pm
MTJ
- IAD
1 stop8h 44m
American Airlines
Deal found 3/10![American Airlines logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
lør. 4/1810:51 am
IAD
- DEN
1 stop13h 38m
Frontier
lør. 4/2511:59 pm
DEN
- IAD
1 stop6h 57m
Frontier
Deal found 3/10![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
ons. 4/296:20 am
IAD
- DEN
1 stop18h 09m
Frontier
tir. 5/511:54 pm
DEN
- IAD
1 stop15h 33m
Frontier
Deal found 3/12![Frontier logo]()
$169
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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.
tor. 4/307:00 am
IAD
- MTJ
1 stop6h 58m
American Airlines
søn. 5/312:42 pm
MTJ
- IAD
1 stop8h 44m
American Airlines
Deal found 3/14![American Airlines logo]()
$289
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 marts 14, 2026.
Search for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated marts 14, 2026.
This Super.com deal was found by Cheapflights users on 3/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 4/104:01 pm
IAD
- DEN
1 stop9h 07m
Frontier
Deal found 3/9![Frontier logo]()
$94
This Expedia deal was found by Cheapflights users on 3/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ons. 4/86:00 am
IAD
- DEN
1 stop8h 09m
Frontier
Deal found 3/9![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
ons. 4/227:15 am
IAD
- DEN
1 stop17h 14m
Frontier
Deal found 3/9![Frontier logo]()
$98
This Southwest deal was found by Cheapflights users on 3/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lør. 4/255:50 am
IAD
- DEN
Nonstop3h 50m
Southwest
Deal found 3/9![Southwest logo]()
$99
This Trip.com deal was found by Cheapflights users on 3/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 4/246:00 am
IAD
- DEN
1 stop7h 51m
Frontier
Deal found 3/10![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
tir. 4/146:05 am
IAD
- DEN
2 stops23h 54m
Frontier
Deal found 3/10![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 3/10. 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.
tor. 4/236:10 am
IAD
- DEN
1 stop7h 59m
Frontier
Deal found 3/10![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
tor. 4/92:01 pm
IAD
- DEN
1 stop29h 51m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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.
man. 4/276:19 pm
IAD
- DEN
1 stop19h 55m
Frontier
Deal found 3/13![Frontier logo]()
$108
This United Airlines deal was found by Cheapflights users on 3/10. 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.
ons. 5/68:12 pm
IAD
- DEN
Nonstop4h 03m
United Airlines
Deal found 3/10![United Airlines logo]()
$109
This United Airlines deal was found by Cheapflights users on 3/10. 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.
tir. 3/316:00 am
IAD
- MTJ
1 stop7h 29m
United Airlines
Deal found 3/10![United Airlines logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 3/11. 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.
ons. 4/157:00 am
IAD
- GJT
2 stops31h 07m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$150
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 marts 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $149 (Kiwi.com) |
One-way from | $94 (Super.com) |
Popular in | March |
Cheapest in | January |
Average price | $358 |
Good round-trip deal | $354 or less |
Good one-way deal | $188 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 marts 14, 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.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
fre. 4/17
6:37 pm-11:19 pm
1 stop6h 42m
Denver Intl
tir. 4/21
6:10 am-4:15 pm
1 stop8h 05m
$257
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
man. 4/13
10:35 pm-12:44 am
Nonstop4h 09m
Denver Intl
søn. 4/19
11:59 pm-5:28 am
Nonstop3h 29m
$257
Quickest round-trip
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
man. 4/13
5:55 pm-8:00 pm
Nonstop4h 05m
Denver Intl
tir. 4/14
6:10 pm-11:40 pm
Nonstop3h 30m
$257
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
fre. 5/1
5:55 am-7:45 am
Nonstop3h 50m
Denver Intl
søn. 5/10
8:25 am-5:25 pm
1 stop7h 00m
$283
Washington, D.C.Montrose
IAD - MTJ
IADMTJ
Washington, D.C. Dulles Intl
tor. 4/30
7:00 am-11:58 am
1 stop6h 58m
Montrose County
søn. 5/3
12:42 pm-11:26 pm
1 stop8h 44m
$289
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
tir. 5/5
5:20 pm-7:29 pm
Nonstop4h 09m
Denver Intl
lør. 5/9
7:50 am-1:21 pm
Nonstop3h 31m
$297
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
tor. 4/30
10:35 pm-12:44 am
Nonstop4h 09m
Denver Intl
søn. 5/3
11:59 pm-5:28 am
Nonstop3h 29m
$317
Washington, D.C.Durango
IAD - DRO
IADDRO
Washington, D.C. Dulles Intl
tor. 4/9
7:00 am-12:11 pm
1 stop7h 11m
Durango La Plata County
tir. 4/14
12:41 pm-11:26 pm
1 stop8h 45m
$338
Washington, D.C.Grand Junction
IAD - GJT
IADGJT
Washington, D.C. Dulles Intl
tor. 5/7
2:37 pm-8:44 pm
1 stop8h 07m
Grand Junction Regnl
søn. 5/10
5:30 am-1:21 pm
1 stop5h 51m
$339
Washington, D.C.Grand Junction
IAD - GJT
IADGJT
Washington, D.C. Dulles Intl
fre. 4/17
2:21 pm-8:59 pm
1 stop8h 38m
Grand Junction Regnl
lør. 4/25
7:01 am-3:46 pm
1 stop6h 45m
$339
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-MTJ
IAD-DRO
IAD-COS
IAD-GJT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Colorado
IAD-USCO
IAD-DEN
IAD-MTJ
IAD-DRO
IAD-COS
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 $217). 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 marts 14, 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 24% 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 March 12, 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 marts 14, 2026.
The most flights from IAD to USCO are scheduled on a Friday (27 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (12 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 marts 14, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andJetBlue 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
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Crew
8.6
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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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Dulles Intl and Colorado flights
Browse other Dulles Intl and Colorado flight options. Last updated on marts 14, 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 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 2,558,603 searches. Data last updated marts 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$257 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$160 | Average$381 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$161 | Average$161 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$333 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$212 | Average$472 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$236 | Average$512 | FlexibilityNo cancel fee | On-timeN/A |