$89 Cheap Flights from Denver (DEN) to Washington (IAD)

View $89 flight on Tue, Oct 14, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from Denver to Washington (DEN-IAD)

Prices were available within the past 7 days and start at $89 for one-way flights and $177 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Oct 14 - Thu, Oct 16
DEN
Denver
IAD
Washington
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Southwest Airlines flight, departing Tue, Oct 14 from Denver to Washington, returning Thu, Oct 16, priced at $177 just found
United
Tue, Oct 7 - Wed, Oct 8
DEN
Denver
IAD
Washington
$178 Roundtrip, found 2 hours ago
$178
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Oct 7 from Denver to Washington, returning Wed, Oct 8, priced at $178 found 2 hours ago
United
Tue, Aug 12 - Thu, Aug 14
DEN
Denver
IAD
Washington
$180 Roundtrip, just found
$180
Roundtrip
just found
Select United flight, departing Tue, Aug 12 from Denver to Washington, returning Thu, Aug 14, priced at $180 just found
United
Tue, Aug 12 - Thu, Aug 21
DEN
Denver
IAD
Washington
$181 Roundtrip, found 9 hours ago
$181
Roundtrip
found 9 hours ago
Select United flight, departing Tue, Aug 12 from Denver to Washington, returning Thu, Aug 21, priced at $181 found 9 hours ago
United
Tue, Aug 12 - Thu, Aug 21
DEN
Denver
IAD
Washington
$182 Roundtrip, found 9 hours ago
$182
Roundtrip
found 9 hours ago
Select United flight, departing Tue, Aug 12 from Denver to Washington, returning Thu, Aug 21, priced at $182 found 9 hours ago
United
Sat, Aug 30 - Mon, Sep 1
DEN
Denver
IAD
Washington
$183 Roundtrip, just found
$183
Roundtrip
just found
Select United flight, departing Sat, Aug 30 from Denver to Washington, returning Mon, Sep 1, priced at $183 just found
United
Sat, Aug 30 - Mon, Sep 1
DEN
Denver
IAD
Washington
$184 Roundtrip, just found
$184
Roundtrip
just found
Select United flight, departing Sat, Aug 30 from Denver to Washington, returning Mon, Sep 1, priced at $184 just found
American Airlines
Thu, Oct 9 - Tue, Oct 14
DEN
Denver
IAD
Washington
$192 Roundtrip, found 17 hours ago
$192
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Thu, Oct 9 from Denver to Washington, returning Tue, Oct 14, priced at $192 found 17 hours ago
Frontier Airlines
Wed, Oct 15 - Sat, Oct 18
DEN
Denver
IAD
Washington
$245 Roundtrip, found 14 hours ago
$245
Roundtrip
found 14 hours ago
Select Frontier Airlines flight, departing Wed, Oct 15 from Denver to Washington, returning Sat, Oct 18, priced at $245 found 14 hours ago
Sun Country Airlines
Thu, Sep 25 - Fri, Oct 10
DEN
Denver
IAD
Washington
$317 Roundtrip, found 3 days ago
$317
Roundtrip
found 3 days ago
Select Sun Country Airlines flight, departing Thu, Sep 25 from Denver to Washington, returning Fri, Oct 10, priced at $317 found 3 days ago

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

April is typically the cheapest month to fly

From $120 - $269 per traveler.

Graph displaying average flight prices per month

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $229
DCA
Ronald Reagan Washington National
CheapestClosest
Average driving time to city center8 min
Flights from $229
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
Roundtrip price
$171
Distance
1449 mi
Average flight time
5 hours 25 mins

Denver to Washington Flights

The cheapest times to fly from Denver to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to Washington are during the month of October. You can find some of the cheapest flights from Denver to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Denver to Washington

Sunday is one of the best days to book for cheap flights from Denver to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Denver to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $89 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) cost?
Cheap round-trip fares from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) start from $148. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines flight leaving DEN on August 9 2025 and touching down at IAD. The price was last updated on July 13 2025 and has not changed since.
What is the cheapest month to fly from DEN to IAD?
The cheapest flights from DEN to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Catch a direct flight with United Airlines and fly straight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD).
What is the cheapest airline that flies from DEN to IAD?
With fares starting at $74 for a one-way flight from DEN to IAD, Southwest Airlines is currently the cheapest carrier on this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from DEN on October 1 2025. Prices were last updated on July 13 2025 and have not changed since.
How many flights per day from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Every day on average, 7 nonstop flights operate from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD). Select the departure time that best fits your itinerary.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
More passengers fly between DEN and IAD at 6 PM than at any other time. Prefer a quieter experience? Travel outside of rush hours and you could save on your fare as well.
What day of the week has the most flights from DEN to IAD?
Monday offers the most flights from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD). Consider jetting off on this day and you'll have a greater chance of finding a schedule that works for you.
What is the earliest flight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Catch the earliest flight at around 6:00AM UTC-7, heading out of Denver Intl. Airport (DEN). You'll be in the air for approximately 3h 23m, touching down at Washington Dulles Intl. Airport (IAD) at approximately 11:23AM UTC-5.
How long does it take to fly from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Typically, it takes 3 hours and 20 minutes to travel the 1,450 mi from DEN to IAD.
What is the best time to fly from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Select a flight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) that leaves before 3 PM to reduce the likelihood of delays. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Washington from Denver Intl. Airport (DEN)?
Board a direct flight from Denver Intl. Airport (DEN) to Washington and land at one of these airports:

  • Ronald Reagan Washington National Airport (DCA)
  • Washington Dulles Intl. Airport (IAD)
  • Baltimore Washington Intl. Thurgood Marshall Airport (BWI)

Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD) last-minute?
Booking your flight from DEN to IAD shortly before your trip is usually more expensive. But if there's some wiggle room with your departure times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a DEN to IAD flight and hotel package?
Compared with arranging flights and hotels separately, booking a DEN to IAD flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one convenient place will take the stress out of travel planning. Just secure your flights and select from our wide range of hotels, then customize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Washington Dulles Intl. Airport (IAD)?
Typically, you're able to cancel or reschedule your DEN to IAD flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you'd like further details, go to our Customer Service portal.

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