DEN - IAD

$76 Find Cheap Flights from Denver to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Dulles Intl departing on 5/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Washington, D.C., as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Washington, D.C., as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$126
Overall average: $339
Frontier
Wed 4/15Tue 4/21
DEN - IAD • 1 stop
Cheapest non-stop
$163
Typical prices: $266-$408
Southwest
Sat 4/18Sat 4/25
DEN - IAD • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
United's Economy Plus offers extra legroom on this route.
Expect multiple daily flights; wide bodies are available.
Expert advice
Expert advice
+1
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Expert advice
Expert advice
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Top airlines
Frontier
Cheapest • from $126 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with Southwest and United Airlines. Average duration is 3h 17m
Direct flights
Direct flights
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Direct flights
Direct flights
+1
Top layover airports
Atlanta (ATL)
Cheapest • Avg $268 (round-trip)
Charlotte (CLT)
Shortest trip • 6h 40m (one-way)
Insights
Insights
Insights
Insights
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 48% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 17% price drop
May
Most popular
Good to know
Good to know
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Good to know
Good to know
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Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Dulles Intl!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Denver to Dulles Intl (DEN-IAD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to Dulles Intl that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Denver to Dulles Intl

Wed, Apr 15 - Tue, Apr 21
Frontier Logo
1:09 pm - 12:36 am
DEN
-
IAD
9h 27m
1 stop
Frontier Logo
6:15 am - 12:14 pm
IAD
-
DEN
7h 59m
1 stop
$126Frontier
Sat, Apr 18 - Tue, Apr 21
Frontier Logo
1:09 pm - 8:56 am
DEN
-
IAD
17h 47m
1 stop
Frontier Logo
6:15 am - 10:29 pm
IAD
-
DEN
18h 14m
1 stop
$129Frontier
Sat, Apr 25 - Wed, Apr 29
Frontier Logo
11:59 pm - 8:56 am
DEN
-
IAD
6h 57m
1 stop
Frontier Logo
6:20 am - 12:09 pm
IAD
-
DEN
7h 49m
1 stop
$132Frontier
Sat, Apr 25 - Tue, Apr 28
Frontier Logo
11:59 pm - 8:56 am
DEN
-
IAD
6h 57m
1 stop
Frontier Logo
6:20 am - 12:14 pm
IAD
-
DEN
7h 54m
1 stop
$134Frontier
Wed, Apr 22 - Wed, Apr 29
Frontier Logo
10:10 am - 6:12 pm
DEN
-
IAD
30h 02m
1 stop
Frontier Logo
6:20 am - 12:09 pm
IAD
-
DEN
7h 49m
1 stop
$137Frontier
Wed, Apr 15 - Fri, Apr 24
Frontier Logo
1:09 pm - 12:36 am
DEN
-
IAD
9h 27m
1 stop
Frontier Logo
8:19 pm - 10:19 am
IAD
-
DEN
16h 00m
1 stop
$140Frontier
Thu, Apr 16 - Tue, Apr 21
Frontier Logo
6:00 am - 6:12 pm
DEN
-
IAD
10h 12m
1 stop
Frontier Logo
6:15 am - 12:14 pm
IAD
-
DEN
7h 59m
1 stop
$141Frontier
Fri, May 15 - Tue, May 19
Frontier Logo
11:59 pm - 9:54 am
DEN
-
IAD
7h 55m
1 stop
Frontier Logo
6:20 am - 11:03 pm
IAD
-
DEN
18h 43m
1 stop
$143Frontier
Thu, Apr 23 - Tue, Apr 28
Frontier Logo
9:00 pm - 7:24 pm
DEN
-
IAD
20h 24m
1 stop
Frontier Logo
6:20 am - 10:29 pm
IAD
-
DEN
18h 09m
1 stop
$144Frontier
Wed, Apr 29 - Sun, May 3
Frontier Logo
1:09 pm - 12:36 am
DEN
-
IAD
9h 27m
1 stop
Frontier Logo
7:11 pm - 10:29 pm
IAD
-
DEN
29h 18m
1 stop
$145Frontier
Booking Insights

KAYAK's insights & trends for Denver to Dulles Intl flights

Get data-powered insights and trends into flights from Denver to Dulles Intl to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Denver to Washington Dulles Airport?

The average price of all round-trip flights from Denver to Washington, D.C. Dulles Intl Airport clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Denver to Washington Dulles Airport, look for departures on Thursdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Washington Dulles Airport, Wednesday is the cheapest day to fly and Sunday is the most expensive.

What is the cheapest month to fly from Denver to Washington, D.C. Dulles Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Denver to Washington, D.C. Dulles Intl Airport is August, where tickets cost $286 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is $392 and $387 respectively.

Can I save money by flying with a layover from Denver to Washington, D.C. Dulles Intl Airport?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $399 on average.

How far in advance should I book a flight from Denver to Washington, D.C. Dulles Intl Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Denver to Washington, D.C. Dulles Intl Airport, you should book around 3 weeks before departure, which saves you about 48% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Expert advice

Expert advice for your flight from Denver to Dulles Intl

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Harriet Baskas

Harriet Baskas

Expert on DEN

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$76
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly with an average 1% increase in price.
Flight from Denver to Washington Dulles Airport

When to book flights from Denver to Dulles Intl

Are your dates flexible? Find out the best times to travel from Denver to Dulles Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Denver to Dulles Intl: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew the route from Denver to Dulles Intl 
NesrinFlew with Southwest
DEN
-
IAD
Feb 2026
Get a seat in the very front if you can, otherwise, it is a very slow process.
JasonFlew with United Airlines
DEN
-
IAD
Nov 2024
DIA is a large airport. Get there early.
BindulFlew with United Airlines
DEN
-
IAD
Feb 2024
There are multiple flights between DEN and IAD everyday, including some wide bodies. Try and get on one of the wide bodies whenever possible.

FAQs for booking Denver to Washington Dulles Airport flights

  • Is the arrival airport accessible to passengers with disabilities?

    All passengers with limited mobility can comfortably access Denver International Airport (DEN). They have made certain that everyone has an excellent travel experience. DEN, in collaboration with the Hidden Disabilities Sunflower organization, provide people with disabilities with a colored lanyard with sunflowers to show that they may require special assistance in their travel. In addition, elevators and ramps are installed in the airport's parking lots to improve accessibility.

  • Where can I stay near Washington Dulles International Airport?

    You can stay at the Hilton Washington Dulles Airport, which offers excellent services and amenities such as a pool and a fitness center. The hotel is strategically located near the airport and provides complimentary airport shuttle services. Other options include Hyatt Regency Dulles, Hyatt Place Herndon, and Courtyard by Marriott Dulles Airport Herndon.

  • How can I fly from Denver to Washington Dulles International Airport?

    Several airlines offer direct flights from Denver. However, you can catch a connecting flight on this route which are considerably cheaper. These flights have one or two layover commonly occurring at George Bush Intercontinental Airport and O’Hare International Airport.

  • Are there pet relief areas in the Denver airport?

    The airport has designated animal relief areas throughout the airport to ensure that your pet has a pleasant journey. They also provide cleaning supplies in the relief areas. You must keep your pet on a leash or in a travel kennel. Pets are welcome at all three airports in Washington, D.C. You can inquire with your airline about their rules and guidelines for traveling with animals, as they may differ between airlines.

  • What is the cheapest flight from Denver to Washington, D.C. Dulles Intl Airport?

    In the last 3 days, the lowest price for a flight from Denver to Washington, D.C. Dulles Intl Airport was $76 for a one-way ticket and $126 for a round-trip.

  • Do I need a passport to fly between Denver and Washington Dulles Airport?

    No

  • Which airports will I be using when flying from Denver to Washington Dulles Airport?

    When flying out of Denver you will be using Denver Intl. You will be landing at Washington Dulles Airport, also known as Washington, D.C. Dulles Intl.

  • Which airlines offer Wi-Fi service onboard planes from Denver to Washington Dulles Airport?

    JetBlue, Finnair, and Lufthansa offer inflight Wi-Fi service on the Denver to Washington Dulles Airport flight route.

  • Which aircraft models fly most regularly from Denver to Washington Dulles Airport?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Denver to Washington Dulles Airport flight route.

  • Which airline alliances offer flights from Denver to Washington Dulles Airport?

    Star Alliance is the only airline alliance operating flights between Denver and Washington Dulles Airport.

  • On which days can I fly direct from Denver to Washington Dulles Airport?

    There are nonstop flights from Denver to Washington Dulles Airport on a daily basis.

  • Which is the best airline for flights from Denver to Washington, D.C., Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Denver to Washington, D.C. are Southwest and United Airlines. With an average price for the route of $291 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $367 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Denver to Washington Dulles Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to Washington Dulles Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Denver with another airline. Booking your flights between Denver and IAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to Washington Dulles Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Denver to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $207 or less one-way and $394 or less round-trip.
  • Flights from Denver to Washington Dulles Airport typically depart from Denver International Airport (DEN), which makes it easy to travel with children. The airport is parent-friendly and is dedicated to ensuring families with young kids have a smooth and easy travel experience. They have designated play areas for kids to play and run around before their flight. Your children can occupy themselves using the Automatic Guideway Terminal System.
  • Several airlines operate lounges at Washington Dulles International Airport (IAD). The lounges offer a tranquil environment in which to relax and unwind after your flight and as you wait for your transportation from the airport. While in the lounges, connect to the Wi-Fi and take advantage of the other services. You can inquire directly with your airline about membership rules and operating hours.
  • When it comes to getting to Denver International Airport, you have several options. From the city, a cab or taxi can get you to the airport in minutes. You can also take the bus or rideshare such as Uber. Taking a taxi is more convenient and cost-effective.
  • Washington Dulles International Airport strives to make travel easier and less intimidating for nursing mothers. Eight nursing rooms are exclusively designated for nursing mothers, four of which are located post-security. These areas provide lactating mothers with the privacy to breastfeed and change their babies.
  • To ensure a smooth travel experience with Denver International Airport, we recommend arriving at least 2h before your flight's departure time. This will give you enough time to check in and go through security. Last-minute rushes can cause inconveniences that you can avoid by arriving early.

Prefer to fly direct from Denver to Washington Dulles Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Denver Intl to Washington, D.C. Dulles Intl.
Find which airlines fly direct from Denver Intl Airport to Washington, D.C. Dulles Intl Airport, which days they fly and book direct flights.

Direct departures

Denver Intl to Washington, D.C. Dulles Intl

Monday

Southwest, United Airlines

Southwest, United Airlines

Tuesday

Southwest, United Airlines

Southwest, United Airlines

Wednesday

Southwest, United Airlines

Southwest, United Airlines

Thursday

Southwest, United Airlines

Southwest, United Airlines

Friday

Southwest, United Airlines

Southwest, United Airlines

Saturday

Southwest, United Airlines

Southwest, United Airlines

Sunday

Southwest, United Airlines

Southwest, United Airlines

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Denver Intl

Monday

Southwest, United Airlines

Southwest, United Airlines

Tuesday

Southwest, United Airlines

Southwest, United Airlines

Wednesday

Southwest, United Airlines

Southwest, United Airlines

Thursday

Southwest, United Airlines

Southwest, United Airlines

Friday

Southwest, United Airlines

Southwest, United Airlines

Saturday

Southwest, United Airlines

Southwest, United Airlines

Sunday

Southwest, United Airlines

Southwest, United Airlines

See more direct flights

Reviews of the top 3 airlines serving from Denver to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Denver to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Dulles Intl? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4300 reviews
8.6Crew
7.0Food
8.1Boarding
8.0Comfort
7.5Entertainment
Airline reviews

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

10.0 ExcellentTy&Steph, Feb 2026
CLT - STL
Read more Southwest reviews

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Still need to work out the kinks on the new assigned seating boarding process. Otherwise, a very good flight.

WiFi did not work. Boarding with the new seating assignments took too long. The temperature in the terminal was obnoxious. +/- 80°

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

Crew was great. 2 1/2 hour delay was due to staff needing "rest" was avoidable and self inflicted as United not willing to hire enough crew to keep flight on time.. Ridiculous. The crew and the passengers both suffered due to this.

Fine not above and beyond as I had a connection that was delayed due to maintenance

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

Great other than a couple very drunk guys that for a while kept bumping my seat from behind. The staff did their best to control them. Even refused serving them alcohol and allowed the gal sitting next to them to move.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

The seats were comfortable and we had leg room. Great entertainment.

The flight crew where really good. Better then the crew from BNE to SFO

Safe made to destination. Late to start at GVA for icy reasons but we fought our next fly.

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

Everything you need to know for your flight from Denver to Dulles Intl

Information on your arrival and departure airports