$109 Cheap Flights from Washington (IAD) to Denver (DEN)

View $109 flight on Wed, May 21, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Washington to Denver (IAD-DEN)

Prices were available within the past 7 days and start at $109 for one-way flights and $217 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Jul 8 - Tue, Jul 15
IAD
Washington
DEN
Denver
$217 Roundtrip, just found
$217
Roundtrip
just found
Select United flight, departing Tue, Jul 8 from Washington to Denver, returning Tue, Jul 15, priced at $217 just found
Southwest Airlines
Wed, Jun 4 - Sat, Jun 14
IAD
Washington
DEN
Denver
$217 Roundtrip, just found
$217
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Jun 4 from Washington to Denver, returning Sat, Jun 14, priced at $217 just found
United
Fri, Jul 4 - Sat, Jul 12
IAD
Washington
DEN
Denver
$225 Roundtrip, just found
$225
Roundtrip
just found
Select United flight, departing Fri, Jul 4 from Washington to Denver, returning Sat, Jul 12, priced at $225 just found
Delta
Tue, Jul 22 - Wed, Jul 23
IAD
Washington
DEN
Denver
$229 Roundtrip, just found
$229
Roundtrip
just found
Select Delta flight, departing Tue, Jul 22 from Washington to Denver, returning Wed, Jul 23, priced at $229 just found
Delta
Tue, Jul 8 - Tue, Jul 15
IAD
Washington
DEN
Denver
$231 Roundtrip, just found
$231
Roundtrip
just found
Select Delta flight, departing Tue, Jul 8 from Washington to Denver, returning Tue, Jul 15, priced at $231 just found
Delta
Tue, Jul 22 - Wed, Jul 23
IAD
Washington
DEN
Denver
$231 Roundtrip, just found
$231
Roundtrip
just found
Select Delta flight, departing Tue, Jul 22 from Washington to Denver, returning Wed, Jul 23, priced at $231 just found
Southwest Airlines
Wed, Jun 4 - Wed, Jun 11
IAD
Washington
DEN
Denver
$232 Roundtrip, just found
$232
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Jun 4 from Washington to Denver, returning Wed, Jun 11, priced at $232 just found
United
Sat, May 24 - Sun, May 25
IAD
Washington
DEN
Denver
$233 Roundtrip, just found
$233
Roundtrip
just found
Select United flight, departing Sat, May 24 from Washington to Denver, returning Sun, May 25, priced at $233 just found
Frontier Airlines
Tue, May 20 - Wed, May 28
IAD
Washington
DEN
Denver
$240 Roundtrip, found 9 hours ago
$240
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Tue, May 20 from Washington to Denver, returning Wed, May 28, priced at $240 found 9 hours ago
American Airlines
Wed, May 21 - Sun, May 25
IAD
Washington
DEN
Denver
$249 Roundtrip, found 4 hours ago
$249
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Wed, May 21 from Washington to Denver, returning Sun, May 25, priced at $249 found 4 hours ago
Flights from Washington (IAD) to Denver (DEN)
Origin airport
Washington Dulles Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$217
Distance
1449 mi

Washington to Denver Flights

The cheapest times to fly from Washington to Denver

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 Washington to Denver are during the month of July. You can find some of the cheapest flights from Washington to Denver with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Washington to Denver

Sunday is one of the best days to book for cheap flights from Washington to Denver: 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 Washington to Denver

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 Washington to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $109 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 Washington to Denver 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 Washington to Denver 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 Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) cost?
You can pick up cheap return flights starting at $183 from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). 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 United and Frontier Airlines flight leaving IAD on May 20 2025 and touching down at DEN. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from IAD to DEN?
The cheapest flights from IAD to DEN 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 Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
Hop on a direct flight with United Airlines and journey straight from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN).
What is the cheapest airline that flies from IAD to DEN?
At the moment, the cheapest carrier operating one-way flights from IAD to DEN is United. You can book a seat on this route from $99. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from IAD on May 20 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
Each day on average, 7 nonstop flights operate from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). Choose the departure that works for you.
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
The 5 PM departures from IAD to DEN are the top choice for many travelers. They can also be more expensive. If you want to save money, book during off-peak hours.
What day of the week has the most flights from IAD to DEN?
Friday offers the most flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). Consider leaving on this day and you’ll have a greater chance of finding a departure that fits your plans.
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
Washington Dulles Intl. Airport (IAD)’s earliest flight to Denver Intl. Airport (DEN) leaves at approximately 6:55AM UTC-5. With a travel time of 4h 5m, you’ll land at around 9:00AM UTC-7.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
It takes around 4 hours and 5 minutes to fly the 1,450 mi from IAD to DEN.
What airline has the least delays from IAD to DEN?
With 85% of flights typically arriving on time, United Airlines has the best on-time performance for direct flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN). To keep track of your flight status and receive notifications if anything changes, simply head to the Expedia App.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) route, fly before 3 PM. Flights after this time are 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 Denver from Washington Dulles Intl. Airport (IAD)?
If you’re on a direct flight from Washington Dulles Intl. Airport (IAD) to Denver, Denver Intl. Airport (DEN) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) last-minute?
Booking your plane ticket from IAD to DEN shortly before your trip is typically more expensive. But if there’s some wiggle room with your departure dates and times, you could land a cheap last-minute fare.
Is it cheaper to book an IAD to DEN flight and hotel package?
You’ll generally save money by booking an IAD to DEN flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it’s simple to manage it all in one convenient place. After selecting your preferred accommodations and flights, consider other add-ons like car rentals, activities and tours.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
In most cases, you can reschedule or cancel your IAD to DEN flight. However, there may be additional fees, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline’s fees and guidelines on flight changes, or if you’d like more details, head to our Customer Service portal.

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*Available to One Key members.