$71 Cheap Flights from Washington (IAD) to Denver (DEN)

View $71 flight on Mon, Nov 10, 2025Opens in a new window

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

Today's featured flight deals from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Washington to Denver (IAD-DEN)

Prices were available within the past 7 days and start at $71 for one-way flights and $141 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Dec 11 - Wed, Dec 17
IAD
Washington
DEN
Denver
$141 Roundtrip, just found
$141
Roundtrip
just found
Select United flight, departing Thu, Dec 11 from Washington to Denver, returning Wed, Dec 17, priced at $141 just found
United
Thu, Dec 11 - Wed, Dec 17
IAD
Washington
DEN
Denver
$151 Roundtrip, just found
$151
Roundtrip
just found
Select United flight, departing Thu, Dec 11 from Washington to Denver, returning Wed, Dec 17, priced at $151 just found
United
Thu, Dec 11 - Wed, Dec 17
IAD
Washington
DEN
Denver
$152 Roundtrip, just found
$152
Roundtrip
just found
Select United flight, departing Thu, Dec 11 from Washington to Denver, returning Wed, Dec 17, priced at $152 just found
United
Sat, Dec 13 - Tue, Dec 16
IAD
Washington
DEN
Denver
$153 Roundtrip, found 1 hour ago
$153
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Dec 13 from Washington to Denver, returning Tue, Dec 16, priced at $153 found 1 hour ago
Southwest Airlines
Sat, Dec 6 - Tue, Dec 9
IAD
Washington
DEN
Denver
$157 Roundtrip, found 1 hour ago
$157
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Sat, Dec 6 from Washington to Denver, returning Tue, Dec 9, priced at $157 found 1 hour ago
United
Thu, Nov 13 - Fri, Nov 14
IAD
Washington
DEN
Denver
$159 Roundtrip, found 1 hour ago
$159
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Nov 13 from Washington to Denver, returning Fri, Nov 14, priced at $159 found 1 hour ago
Southwest Airlines
Sat, Dec 6 - Tue, Dec 9
IAD
Washington
DEN
Denver
$161 Roundtrip, found 1 hour ago
$161
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Sat, Dec 6 from Washington to Denver, returning Tue, Dec 9, priced at $161 found 1 hour ago
Frontier Airlines
Wed, Nov 5 - Sat, Nov 8
IAD
Washington
DEN
Denver
$164 Roundtrip, found 1 hour ago
$164
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Wed, Nov 5 from Washington to Denver, returning Sat, Nov 8, priced at $164 found 1 hour ago
American Airlines
Thu, Dec 11 - Wed, Dec 17
IAD
Washington
DEN
Denver
$165 Roundtrip, just found
$165
Roundtrip
just found
Select American Airlines flight, departing Thu, Dec 11 from Washington to Denver, returning Wed, Dec 17, priced at $165 just found
Delta
Mon, Dec 15 - Tue, Dec 16
IAD
Washington
DEN
Denver
$251 Roundtrip, found 5 hours ago
$251
Roundtrip
found 5 hours ago
Select Delta flight, departing Mon, Dec 15 from Washington to Denver, returning Tue, Dec 16, priced at $251 found 5 hours ago

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

April is typically the cheapest month to fly

From $120 - $396 per traveler.

Alternative airports near Denver

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

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $245
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $245
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
$141
Distance
1449 mi
Average flight time
1 hour 52 mins

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 December. 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 $71 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?
Get a cheap one-way flight from $71 or cheap return flight from $141 from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
December is the most affordable month to fly from IAD to DEN. Avoiding peak travel times is often the key to better flight prices.
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 Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN)?
The cheapest airline to offer flights between Washington Dulles Intl. Airport (IAD) and Denver Intl. Airport (DEN) can vary based on when you want to travel. Southwest Airlines and United Airlines are just some well-known options offering reasonable prices. Use Expedia's filters to compare airlines in one place and find the right IAD to DEN flight that fits your budget.
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.