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

View AU$265 flight on Wed, 13 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 for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$711 Return, found 3 days ago
AU$711
Return
found 3 days ago
Select American Airlines flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$711 found 3 days ago
United
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$716 Return, found 3 days ago
AU$716
Return
found 3 days ago
Select United flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$716 found 3 days ago
United
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$719 Return, found 3 days ago
AU$719
Return
found 3 days ago
Select United flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$719 found 3 days ago
United
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$730 Return, found 3 days ago
AU$730
Return
found 3 days ago
Select United flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$730 found 3 days ago
United
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$733 Return, found 3 days ago
AU$733
Return
found 3 days ago
Select United flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$733 found 3 days ago
United
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$747 Return, found 3 days ago
AU$747
Return
found 3 days ago
Select United flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$747 found 3 days ago
United
Fri, 7 Aug - Mon, 10 Aug
IAD
Washington
DEN
Denver
AU$758 Return, found 5 days ago
AU$758
Return
found 5 days ago
Select United flight, departing Fri, 7 Aug from Washington to Denver, returning Mon, 10 Aug, priced at AU$758 found 5 days ago
United
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$767 Return, found 3 days ago
AU$767
Return
found 3 days ago
Select United flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$767 found 3 days ago
Delta
Tue, 4 Aug - Fri, 7 Aug
IAD
Washington
DEN
Denver
AU$781 Return, found 3 days ago
AU$781
Return
found 3 days ago
Select Delta flight, departing Tue, 4 Aug from Washington to Denver, returning Fri, 7 Aug, priced at AU$781 found 3 days ago
Alaska Airlines
Fri, 7 Aug - Mon, 10 Aug
IAD
Washington
DEN
Denver
AU$933 Return, found 5 days ago
AU$933
Return
found 5 days ago
Select Alaska Airlines flight, departing Fri, 7 Aug from Washington to Denver, returning Mon, 10 Aug, priced at AU$933 found 5 days ago

Frequently asked questions

How much is a flight from Washington Dulles Intl. Airport (IAD) to Denver Airport?
If you're travelling from IAD to Denver Airport, round-trip flights start from AU$711. This figure is based on airfares listed within the last 7 days on Expedia for flights departing within the next year, so don't hang around. Book today and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from IAD to DIA airport?
We get that things come up unexpectedly, so we've made it as easy as possible for you to cancel your trip online. Just head to the Customer Service Portal and follow the instructions.
How do I find cheap flights from Washington Dulles Intl. Airport (IAD) to Denver Intl. Airport (DEN) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Dulles Intl. Airport to DEN flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Dulles Intl. Airport to DEN?
The flight distance between IAD and DEN is 2 300 kilometres. Listen to some music or bury your nose in a book and the trip will whiz by.
Which airlines fly direct from IAD to Denver Airport?
A popular airline that operates on the route from Dulles Intl. Airport to Denver Airport is United Airlines (UA). It offers 182 flights every month. Another airline operating on this route is Southwest Airlines (WN). You'll have 56 flights a month to select from.
Are IAD to DEN flight tickets cheaper when they're purchased at the last minute?
Tickets from Washington Dulles Intl. Airport (IAD) to DIA airport are available up to 12 months before departure on Expedia. And although you may occasionally nab a fantastic last-minute deal, it's never something you can count on. Also, booking your flights ahead of time means you'll have more choices — and you can avoid getting trapped in the dreaded middle seat! We regularly update our fares to bring you the best bargains, so check back often for all the latest specials.

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 $209 and $805 and return flights often range between $500 and $1,829. 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 around 409 AUD. 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 great 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 409 AUD. 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 make the most of 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. Around 29% of passengers reckon this time's best. Heaps of 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.
Return price
AU$710
Distance
2318 km
Average flight time
2 hours 2 mins

Book with confidence

Your quick guide to flights from Washington to Denver

Pick up great flights from Washington to Denver

With Expedia, you have your pick of flights a day with 20 airlines covering flights from Washington to Denver. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Washington to Denver that take around hours.

Find cheap flights from Washington to Denver

From the great flight deals with prices currently ranging from AU$711 to AU$933, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Washington to Denver around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Denver is normally in August.

Reasons to book your flight from Washington to Denver with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Washington to Denver across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Denver right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from Washington to Denver

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