£110 Cheap Flights from Washington (IAD) to Denver (DEN)

View £110 flight on Tue, 19 May 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 £110 for one-way flights and £245 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£245 Return, found 2 days ago
£245
Return
found 2 days ago
Select American Airlines flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £245 found 2 days ago
Delta
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£246 Return, found 2 days ago
£246
Return
found 2 days ago
Select Delta flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £246 found 2 days ago
Delta
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£257 Return, found 2 days ago
£257
Return
found 2 days ago
Select Delta flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £257 found 2 days ago
American Airlines
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£272 Return, found 2 days ago
£272
Return
found 2 days ago
Select American Airlines flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £272 found 2 days ago
United
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£272 Return, found 2 days ago
£272
Return
found 2 days ago
Select United flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £272 found 2 days ago
Delta
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£279 Return, found 2 days ago
£279
Return
found 2 days ago
Select Delta flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £279 found 2 days ago
American Airlines
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£283 Return, found 2 days ago
£283
Return
found 2 days ago
Select American Airlines flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £283 found 2 days ago
United
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£286 Return, found 2 days ago
£286
Return
found 2 days ago
Select United flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £286 found 2 days ago
Delta
Tue, 19 May - Sat, 23 May
IAD
Washington
DEN
Denver
£290 Return, found 2 days ago
£290
Return
found 2 days ago
Select Delta flight, departing Tue, 19 May from Washington to Denver, returning Sat, 23 May, priced at £290 found 2 days ago
Alaska Airlines
Mon, 1 Jun - Thu, 4 Jun
IAD
Washington
DEN
Denver
£416 Return, found 2 days ago
£416
Return
found 2 days ago
Select Alaska Airlines flight, departing Mon, 1 Jun from Washington to Denver, returning Thu, 4 Jun, priced at £416 found 2 days 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 £582
DEN
Denver Intl.
Cheapest
Average driving time to city centre32 min
Flights from £582

Frequently asked questions

How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) cost?
One-way flights typically cost between £110 and £423 and return flights often range between £263 and £961. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
September is typically the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.), with average return fares of approximately £226. This is about 16% lower than the average price throughout the year. September often sees lower prices as the summer travel rush ends and before the holiday season begins, leading to reduced demand. Other cheap months to fly from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) include July and August.
Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
Enter IAD to DEN and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.), 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 airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
The best airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) will differ from traveller to traveller. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. UA offers the most daily flights from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
Based on booking data from the past year, the cheapest months to fly from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) are typically September and August, with average return flights around £226. However, the most popular months for this route are April and June, which means you'll find plenty of flight options during these times. If you're looking for the best balance of value and availability, consider flying in September or August for lower fares, or in April and June if having a wide selection of flights is your top priority.
How many flights per day from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
When flying from Washington Dulles Intl. (IAD) to Denver Intl. (DEN), you'll find approximately 12 nonstop flights per day. For even more choice, look at flights that include layovers, as there are around 99 connecting flights per day. Some common connection points include Seattle - Tacoma Intl. (SEA), Hartsfield-Jackson Atlanta Intl. (ATL), and Charlotte-Douglas Intl. (CLT).
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
The earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in February and March. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
If you're flying from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.), you'll typically find the most flights on a Friday, with around 52 flights available. This gives you plenty of options to choose from for your travel plans. Major airlines on this route include United Airlines, Delta Air Lines, and American Airlines. Flight options are notably more plentiful on Fridays and Thursdays compared to other days of the week, offering you more flexibility.
What are the most popular departure times for flights from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
The most popular departure times for flights from Washington Dulles Intl. (IAD) to Denver Intl. (DEN) are in the early morning, from 6am to 9am. About 29% of passengers prefer this time. Many major carriers, including Delta, United Airlines and American Airlines, offer flights during this window. This timing works well because it allows you to get an early start on your travel day and arrive in Denver with plenty of time to settle in or begin your activities.
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 1,449 miles. If you opt for a connecting flight, expect to add around 3 hours 20 minutes 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-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
Select the "Business class" and "First class" filters when looking for IAD to 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-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) 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.
What airports do you fly into for Denver from Washington Dulles Intl. (IAD)?
If you're planning to travel to Denver from Washington Dulles Intl. (IAD), you can fly directly into Denver Intl. (DEN) Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), San Diego Intl. (SAN), Charlotte-Douglas Intl. (CLT) before reaching Denver. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) 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-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) flight and hotel package?
Securing a Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) 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-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.)?
If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Denver, CO (DEN-Denver Intl.) 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
Return price
£244
Distance
2318 km
Average flight time
2 hours 2 mins

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