$89 Cheap United flights Denver (DEN) to Washington (IAD)

View $89 flight on Wed, Nov 12, 2025Opens in a new window

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$89 Cheap United flights Denver (DEN) to Washington (IAD)

Prices were available within the past 7 days and start at $89 for one-way flights and $172 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Nov 11 - Wed, Nov 12
DEN
Denver
IAD
Washington
$172 Roundtrip, found 13 hours ago
$172
Roundtrip
found 13 hours ago
Select United flight, departing Tue, Nov 11 from Denver to Washington, returning Wed, Nov 12, priced at $172 found 13 hours ago
United
Tue, Oct 28 - Tue, Nov 4
DEN
Denver
IAD
Washington
$180 Roundtrip, just found
$180
Roundtrip
just found
Select United flight, departing Tue, Oct 28 from Denver to Washington, returning Tue, Nov 4, priced at $180 just found
United
Wed, Sep 17 - Sat, Sep 27
DEN
Denver
IAD
Washington
$183 Roundtrip, found 18 hours ago
$183
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Sep 17 from Denver to Washington, returning Sat, Sep 27, priced at $183 found 18 hours ago
United
Wed, Sep 17 - Sat, Sep 27
DEN
Denver
IAD
Washington
$189 Roundtrip, found 18 hours ago
$189
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Sep 17 from Denver to Washington, returning Sat, Sep 27, priced at $189 found 18 hours ago
United
Thu, Nov 6 - Thu, Nov 13
DEN
Denver
IAD
Washington
$195 Roundtrip, just found
$195
Roundtrip
just found
Select United flight, departing Thu, Nov 6 from Denver to Washington, returning Thu, Nov 13, priced at $195 just found
United
Mon, Nov 10 - Mon, Nov 17
DEN
Denver
IAD
Washington
$199 Roundtrip, just found
$199
Roundtrip
just found
Select United flight, departing Mon, Nov 10 from Denver to Washington, returning Mon, Nov 17, priced at $199 just found
United
Fri, Sep 12 - Fri, Sep 19
DEN
Denver
IAD
Washington
$205 Roundtrip, just found
$205
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Denver to Washington, returning Fri, Sep 19, priced at $205 just found
Flights from Denver (DEN) to Washington (IAD)
Origin airport
Denver Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
Delta
Distance
1449 mi
Average flight time
5 hours 23 mins

Frequently asked questions

How much is a United Airlines flight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Finding cheap one-way United Airlines flights from DEN to IAD from $89 on Expedia is simple — just filter by "Price (lowest to highest)." Or check out our budget-friendly return fares from $172 for your next exciting adventure.**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 DEN to IAD with United Airlines?
United Airlines flights to Washington are typically more affordable in the quieter months of January and February. Whether you're after a return or one-way ticket, you could score a better deal then.
What is the cheapest time to book flights from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) with United Airlines?
Start searching one to three months ahead of your departure date to find cheap fares on United Airlines flights from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic flights.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Yes, you can travel from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) on one of United Airlines's 42 direct weekly flights. Use Expedia's "Nonstop" and "Airline" filters to find the United Airlines flight that'll get you to IAD at your preferred time.
How long does it take to fly from DEN to IAD with United Airlines?
It takes around 3h 21m to travel nonstop from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) with United Airlines.
Which day of the week has the most United Airlines flights from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
United Airlines has the most flights from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) on Tuesday. With up to 6 daily departures, you'll get the most options and flexibility on this day.
What is the earliest United Airlines flight from DEN to IAD?
Jetting off from DEN at 6:00AM UTC-7, the earliest United Airlines flight to IAD arrives at 11:23AM UTC-5. Flying earlier in the day means you'll be less likely to encounter delays.* Prefer a later start? The last United Airlines flight from DEN to IAD departs at 6:10PM UTC-7 and touches down at 11:30PM UTC-5.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Washington?
United Airlines flights from Denver Intl. Airport (DEN) to Washington come in to Washington Dulles Intl. Airport (IAD), Ronald Reagan Washington National Airport (DCA) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI). The primary Washington hub for this carrier is IAD. It's worth considering flights arriving at other nearby airports on Expedia as they may offer lower prices.
Why fly with United Airlines from DEN to IAD?
Offering a rewarding loyalty program, United Airlines is a favorite of many travelers flying from DEN to IAD. Plus, if you're a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
You'll likely be seated on a Boeing 737-900 or a Boeing 777 when flying United Airlines from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD). However, keep in mind that a different plane could be assigned to your route due to operational demands.
Can I change or cancel my United Airlines flight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Typically, you can change or cancel your flight, although there may be additional fees if you made your booking more than 24 hours ago. Prefer to keep your options open? Apply the "Changes included" or "No cancel fee" filter to find flights that won't charge you extra if you need to revise your plans. To update your booking, head to "Trips," select your flight and click on "Manage Booking" for more details.

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