$128+ Cheap flights from Dulles Intl (IAD) to Denver (DEN)
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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Oct 28 — Nov 41
Round-trip
1 adult, Economy
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Find cheap flights from Dulles Intl to Denver with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Denver Intl are usually found in January or February, booked 44 days in advance, depart on a Wednesday or Tuesday and return on a Thursday
Cheap flight deals from Dulles Intl to Denver
Cheapest
Best
Last-minute
One-way
Cheapest flights from Dulles Intl to DenverExplore the most affordable flight options available from Dulles Intl to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 28, 2026.
Explore the most affordable flight options available from Dulles Intl to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 28, 2026.
This Mytrip deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:06 pm -
2 stops20h 48m
Sat 10/2410:38 am -
1 stop11h 43m
Deal found 9/27![Frontier logo]()
$254
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/239:06 pm -
2 stops17h 06m
Fri 10/307:02 pm -
1 stop13h 19m
Deal found 9/23![Frontier logo]()
$255
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/129:06 pm -
1 stop13h 16m
Sun 11/156:58 pm -
1 stop15h 53m
Deal found 9/27![Frontier logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:52 am -
1 stop15h 40m
Thu 11/59:19 pm -
1 stop12h 17m
Deal found 9/27![Frontier logo]()
$257
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:00 am -
1 stop8h 18m
Tue 10/209:19 pm -
1 stop12h 15m
Deal found 9/27![Frontier logo]()
$259
This Frontier deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:06 pm -
1 stop13h 16m
Thu 11/59:19 pm -
1 stop12h 17m
Deal found 9/28![Frontier logo]()
$260
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:12 am -
1 stop10h 48m
Wed 10/2110:40 am -
1 stop21h 37m
Deal found 9/23![Frontier logo]()
$261
This Mytrip deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/99:06 pm -
2 stops20h 47m
Wed 11/116:31 pm -
2 stops13h 50m
Deal found 9/28![Frontier logo]()
$262
This Kiwi.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:16 am -
2 stops15h 07m
Mon 11/237:50 pm -
1 stop7h 20m
Deal found 9/24![Frontier logo]()
$263
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:06 pm -
1 stop13h 16m
Mon 11/29:19 pm -
1 stop12h 17m
Deal found 9/23![Frontier logo]()
$264
This Cheapflightsfares deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” 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.
Tue 10/209:06 pm -
1 stop13h 00m
Fri 10/238:45 pm -
1 stop7h 35m
Deal found 9/24![Frontier logo]()
$265
Best flights from Dulles Intl to DenverDiscover carefully curated flight deals from Dulles Intl to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 28, 2026.
Discover carefully curated flight deals from Dulles Intl to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 28, 2026.
This United Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/412:40 pm -
Nonstop4h 08m
Sun 11/811:59 pm -
Nonstop3h 20m
Deal found 9/25![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2310:34 pm -
Nonstop3h 54m
Sun 11/17:40 am -
Nonstop3h 16m
Deal found 9/25![United Airlines logo]()
$359
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.
Tue 11/246:10 am -
Nonstop4h 09m
Thu 12/35:55 pm -
Nonstop3h 20m
Deal found 9/23![United Airlines logo]()
$469
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 12/2510:12 pm -
Nonstop4h 03m
Sat 1/235:55 pm -
Nonstop3h 18m
Deal found 9/23![United Airlines logo]()
$469
This United Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:35 am -
Nonstop3h 53m
Fri 10/166:00 am -
Nonstop3h 25m
Deal found 9/27![United Airlines logo]()
$474
This United Airlines deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” 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 10/116:35 am -
Nonstop3h 53m
Sun 10/186:00 am -
Nonstop3h 25m
Deal found 9/24![United Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:34 pm -
Nonstop3h 56m
Sun 10/1811:52 pm -
Nonstop3h 25m
Deal found 9/27![United Airlines logo]()
$500
This United Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2110:34 pm -
Nonstop3h 56m
Wed 10/289:35 am -
1 stop9h 44m
Deal found 9/27![United Airlines logo]()
$505
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 10/2310:34 pm -
Nonstop3h 54m
Wed 10/289:35 am -
1 stop9h 44m
Deal found 9/23![United Airlines logo]()
$505
This United Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2210:10 pm -
Nonstop4h 07m
Sat 11/286:00 am -
Nonstop3h 19m
Deal found 9/27![United Airlines logo]()
$548
This United Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1610:34 pm -
Nonstop3h 56m
Tue 10/209:55 am -
1 stop9h 30m
Deal found 9/27![United Airlines logo]()
$601
Last-minute flights from Dulles Intl to DenverDiscover last-minute flight deals from Dulles Intl to Denver. Data last updated September 28, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Denver. Data last updated September 28, 2026 and is based on user searches.
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/139:06 pm -
2 stops17h 06m
Fri 10/168:45 pm -
1 stop7h 35m
Deal found 9/23![Frontier logo]()
$262
This Expedia deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:00 am -
1 stop19h 43m
Tue 10/209:19 pm -
1 stop12h 15m
Deal found 9/25![Frontier logo]()
$263
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:12 am -
1 stop10h 48m
Wed 10/2110:40 am -
1 stop21h 37m
Deal found 9/23![Frontier logo]()
$261
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:00 am -
1 stop8h 18m
Tue 10/209:19 pm -
1 stop12h 15m
Deal found 9/27![Frontier logo]()
$259
This Cheapflightsfares deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” 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.
Tue 10/209:06 pm -
1 stop13h 00m
Fri 10/238:45 pm -
1 stop7h 35m
Deal found 9/24![Frontier logo]()
$265
This Mytrip deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:06 pm -
2 stops20h 48m
Sat 10/2410:38 am -
1 stop11h 43m
Deal found 9/27![Frontier logo]()
$254
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2211:12 am -
1 stop10h 48m
Sun 10/2510:45 pm -
1 stop29h 35m
Deal found 9/28![Frontier logo]()
$256
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/239:06 pm -
2 stops17h 06m
Fri 10/307:02 pm -
1 stop13h 19m
Deal found 9/23![Frontier logo]()
$255
This Frontier deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:06 pm -
1 stop13h 16m
Thu 11/59:19 pm -
1 stop12h 17m
Deal found 9/28![Frontier logo]()
$260
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:06 pm -
1 stop13h 16m
Mon 11/29:19 pm -
1 stop12h 17m
Deal found 9/23![Frontier logo]()
$264
This Kiwi.com deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:52 am -
1 stop15h 40m
Thu 11/59:19 pm -
1 stop12h 17m
Deal found 9/27![Frontier logo]()
$257
One-way flights from Dulles Intl to DenverSearch for one-way flight options from Dulles Intl to Denver. Find affordable one-way fares based on user searches. Data last updated September 28, 2026.
Search for one-way flight options from Dulles Intl to Denver. Find affordable one-way fares based on user searches. Data last updated September 28, 2026.
This Super.com deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:00 am -
1 stop8h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/159:06 pm -
2 stops26h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$129
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:12 am -
2 stops22h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” 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 11/66:36 pm -
2 stops15h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Multiple Airlines logo]()
$131
This Super.com deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:06 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$132
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:00 am -
1 stop8h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$133
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:06 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:06 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$136
This Mytrip deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:08 pm -
2 stops16h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$137
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1011:02 am -
1 stop22h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$138
This Cheapflightsfares deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” 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 10/1511:12 am -
1 stop22h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$139
Find flight deals from Dulles Intl to Denver
Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $254 (Mytrip) |
One-way from | $128 (Super.com) |
Popular in | July |
Cheapest in | January |
Average price | $467 |
Good round-trip deal | $423 or less |
Good one-way deal | $308 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Dulles Intl to Denver 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 28, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Denver that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Fri 10/16
6:35 am-8:28 am
Nonstop3h 53m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$214
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Mon 11/23
8:20 am-10:29 am
Nonstop4h 09m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$214
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Fri 10/9
7:13 pm-11:58 pm
1 stop6h 45m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$255
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Sat 12/19
7:30 pm-9:33 pm
Nonstop4h 03m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$259
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Mon 11/9
5:17 pm-7:19 pm
2 stops28h 02m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$303
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Wed 12/9
12:35 pm-2:44 pm
Nonstop4h 09m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$309
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Wed 11/18
5:20 pm-7:30 pm
Nonstop4h 10m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$309
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Mon 10/19
10:34 pm-12:30 am
Nonstop3h 56m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$309
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Mon 11/30
10:10 pm-12:19 am
Nonstop4h 09m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$309
Washington, D.C.Denver
IAD Washington, D.C. Dulles Intl - DEN Denver Intl
IADDEN
Washington, D.C. Dulles Intl
Sun 10/18
6:35 am-8:28 am
Nonstop3h 53m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$314
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Dulles Intl to Denver
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Denver in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Denver flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Denver flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Denver flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Denver flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Denver flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Dulles Intl to Denver
Have a flexible travel schedule? Discover the best time to fly to Denver from Dulles Intl with our price prediction graph.
IAD-DEN
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 Denver
Prices
Airlines
Delays
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Denver?
To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Denver, you should look to book at least 43 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Denver?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Denver (average of $317). Flying from Washington, D.C. Dulles Intl Airport to Denver in July is currently the most expensive (average of $540). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from IAD to DEN?
Find hourly flight availability from Dulles Intl to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 28, 2026.
It’s optimal to fly from Washington, D.C. Dulles Intl Airport to Denver in the evening. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the morning.
What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Denver?
Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Denver. Price data was last updated on September 26, 2026.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Denver flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
How often are flights from Washington, D.C. to Denver delayed?
About 12% of weekly flights between Washington, D.C. and Denver have experienced delays in the past year, with the average delay time being 159 minutes.
What is the most punctual flight time for Washington, D.C. to Denver flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Washington, D.C. to Denver flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 11% of flights being delayed.
The best insider tips for Washington, D.C. Dulles Intl Airport to Denver flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to Denver trip
Our travel experts
Reviews of airlines servicing Denver
Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated September 28, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Denver, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Entertainment
7.5
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 Denver. 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 Denver?
Book flights to Denver if you plan to visit one of these locationsThornton
Westminster
Lakewood
Centennial
Black Hawk
Broomfield
Golden
Wheat Ridge
Silverthorne
Central City
Fort Morgan
Greeley
Cripple Creek
Frisco
Winter Park
Limon
Englewood
Manitou Springs
Glendale
Evergreen
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Other flights to Denver
Explore flights to Denver departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 28, 2026.
Search flights from Dulles Intl to Denver by cabin class
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Dulles Intl and Denver flights
Browse other Dulles Intl and Denver flight options. Last updated on September 28, 2026.
Other flights from Dulles Intl
Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on September 28, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from Dulles Intl to Denver
Discover the top 6 airlines that operate flights from Dulles Intl to Denver. 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 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$287 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$161 | Average$360 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$197 | Average$354 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$247 | Average$476 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$272 | Average$638 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$332 | Average$442 | FlexibilityNo cancel fee | On-time71% |