£123 Cheap United flights from Washington to Denver (IAD→DEN)

View £123 flight on Tue, 19 May 2026Opens in a new window

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United flights from Washington to Denver (IAD→DEN)

Prices were available within the past 7 days and start at £123 for one-way flights and £396 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, 28 Jun - Thu, 2 Jul
IAD
Washington
DEN
Denver
£396 Return, found 3 days ago
£396
Return
found 3 days ago
Select United flight, departing Sun, 28 Jun from Washington to Denver, returning Thu, 2 Jul, priced at £396 found 3 days ago
United
Sun, 28 Jun - Wed, 1 Jul
IAD
Washington
DEN
Denver
£398 Return, found 3 days ago
£398
Return
found 3 days ago
Select United flight, departing Sun, 28 Jun from Washington to Denver, returning Wed, 1 Jul, priced at £398 found 3 days ago
United
Mon, 1 Jun - Sun, 21 Jun
IAD
Washington
DEN
Denver
£409 Return, found 3 days ago
£409
Return
found 3 days ago
Select United flight, departing Mon, 1 Jun from Washington to Denver, returning Sun, 21 Jun, priced at £409 found 3 days ago
United
Thu, 25 Jun - Mon, 6 Jul
IAD
Washington
DEN
Denver
£412 Return, found 3 days ago
£412
Return
found 3 days ago
Select United flight, departing Thu, 25 Jun from Washington to Denver, returning Mon, 6 Jul, priced at £412 found 3 days ago

Find the cheapest month to fly from Washington (IAD) to Denver (DEN)

April is typically the cheapest month to fly

From £91 - £384 per traveller.

Frequently asked questions

How much is a United Airlines flight from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
Make use of the "Price (lowest to highest)" filter on Expedia to search for cheap United Airlines round-trip flights from £396 from IAD to DEN. Affordable one-way fares from £123 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IAD to DEN with United Airlines?
Browse for one-way or return flights to Denver in January or November. You could find a cheap fare with United Airlines during these off-peak travel months.
Does United Airlines fly nonstop from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
Depart on one of United Airlines's 42 weekly direct flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). To see what's available, enter your travel dates, origin and destination and hit search. Next, apply the "Nonstop" and "Airline" filters.
How long does it take to fly from IAD to DEN with United Airlines?
On average, it takes 4h 4m to fly nonstop from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) with United Airlines.
Which day of the week has the most United Airlines flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
United Airlines operates the most flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) on Monday. With up to 6 daily departures, you'll get the most options and flexibility on this day.
What airports does United Airlines fly into in Denver?
Denver Intl. Airport (DEN) is the primary Denver hub for United Airlines flights from Washington Dulles Intl. Airport (IAD).
What type of plane does United Airlines fly from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
You'll likely be onboard a Boeing 757-300 or a Boeing 737-900 when flying United Airlines from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). However, keep in mind that a different aircraft may be assigned depending on operational demands.
Can I change or cancel my United Airlines flight from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
Depending on your fare type, a fee typically applies if you change or cancel your booking more than 24 hours after confirmation. To find flexible plane tickets, select our "No cancel fee" or "Changes included" filter while searching for flights. For more details on cancelling or changing your reservation, visit "Trips," select your flight and click on "Manage Booking."

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, Turkish Airlines
Popular airline
Alaska Airlines
Distance
2318 km
Average flight time
2 hours 1 min

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