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£133 Cheap Flights from Washington (IAD) to Denver (DEN)

View £133 flight on Tue, 29 Sept 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at £133 for one-way flights and £265 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 14 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£265 Return, found 2 days ago
£265
Return
found 2 days ago
Select Delta flight, departing Sat, 14 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £265 found 2 days ago
American Airlines
Wed, 25 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£280 Return, found 3 days ago
£280
Return
found 3 days ago
Select American Airlines flight, departing Wed, 25 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £280 found 3 days ago
Delta
Wed, 25 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£280 Return, found 3 days ago
£280
Return
found 3 days ago
Select Delta flight, departing Wed, 25 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £280 found 3 days ago
Delta
Sat, 14 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£281 Return, found 2 days ago
£281
Return
found 2 days ago
Select Delta flight, departing Sat, 14 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £281 found 2 days ago
Alaska Airlines
Tue, 29 Sept - Wed, 30 Sept
IAD
Washington
DEN
Denver
£288 Return, found 2 days ago
£288
Return
found 2 days ago
Select Alaska Airlines flight, departing Tue, 29 Sept from Washington to Denver, returning Wed, 30 Sept, priced at £288 found 2 days ago
American Airlines
Wed, 25 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£295 Return, found 3 days ago
£295
Return
found 3 days ago
Select American Airlines flight, departing Wed, 25 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £295 found 3 days ago
Alaska Airlines
Sat, 12 Dec - Mon, 14 Dec
IAD
Washington
DEN
Denver
£308 Return, just found
£308
Return
just found
Select Alaska Airlines flight, departing Sat, 12 Dec from Washington to Denver, returning Mon, 14 Dec, priced at £308 just found
American Airlines
Sat, 14 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£312 Return, found 2 days ago
£312
Return
found 2 days ago
Select American Airlines flight, departing Sat, 14 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £312 found 2 days ago
Delta
Sat, 14 Nov - Thu, 26 Nov
IAD
Washington
DEN
Denver
£314 Return, found 2 days ago
£314
Return
found 2 days ago
Select Delta flight, departing Sat, 14 Nov from Washington to Denver, returning Thu, 26 Nov, priced at £314 found 2 days ago
United
Mon, 5 Jul - Mon, 19 Jul
IAD
Washington
DEN
Denver
£317 Return, found 2 hours ago
£317
Return
found 2 hours ago
Select United flight, departing Mon, 5 Jul from Washington to Denver, returning Mon, 19 Jul, priced at £317 found 2 hours ago

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 centre is 32 minutes. Flights from £745
DEN
Denver Intl.
Cheapest
Average driving time to city centre32 min
Flights from £745

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

September is typically the cheapest month to fly

From £126 - £174 per traveller.

Frequently asked questions

How much does a flight from Washington, DC (IAD) to Denver, CO (DEN) cost?
You can find one-way and return flights from Washington, DC (IAD) to Denver, CO (DEN) with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to DEN ticket fares go up or down.
What is the cheapest month to fly from Washington, DC (IAD) to Denver, CO (DEN)?
The cheapest months to fly from Washington, DC (IAD) to Denver, CO (DEN) are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Washington, DC (IAD) to Denver, CO (DEN)?
Enter IAD to DEN and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
Frontier Airlines offers one of the cheapest connecting return flights on this route, with tickets starting from around £110. United is one of the cheapest airlines offering nonstop return flights from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.), with tickets starting from around £350 for flights that can be booked for departure within the next year. These prices are per adult, for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Washington, DC (IAD) to Denver, CO (DEN)?
To find a cheap flight from Washington, DC (IAD) to Denver, CO (DEN), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Washington, DC (IAD) to Denver, CO (DEN)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Washington, DC (IAD) to Denver, CO (DEN)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from Washington, DC (IAD) to Denver, CO (DEN). To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
Direct flights from IAD to DEN usually take about 4 hours, traveling roughly 2,332 kilometers. If you opt for a connecting flight, expect to add around 2 hours to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (IAD) to Denver, CO (DEN)?
Select the "Business class" and "First class" filters when looking for Washington, DC (IAD) to Denver, CO (DEN) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Washington, DC (IAD) to Denver, CO (DEN) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD) to Denver, CO (DEN) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Washington, DC (IAD) to Denver, CO (DEN) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD) to Denver, CO (DEN) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD) to Denver, CO (DEN) flight and hotel package?
Securing a Washington, DC (IAD) to Denver, CO (DEN) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD) to Denver, CO (DEN)?
If you booked your Washington, DC (IAD) to Denver, CO (DEN) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Return price
£265
Distance
2318 km
Average flight time
2 hours 15 mins

Book with confidence

Compare flights from Washington to Denver easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Washington to Denver. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Denver Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Washington Dulles Intl. to Denver Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Washington Dulles Intl. (IAD) to Denver Intl. (DEN)

The easiest way to view the best deals on flights from Washington to Denver today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Washington Dulles Intl. to Denver Intl. start at just £265 and range up to £317.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Washington and Denver
  • booking your flight during November, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Washington to Denver flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Washington Dulles Intl. to Denver Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Washington to Denver easily and book with confidence

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*Available to Expedia members.