DEN - IAD

$79 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
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Everything you should know

Cheapest round-trip
$179
Typical prices: $479-$317
Frontier
Do 5/14Mo 5/18
DEN - IAD • 1 stop
Cheapest non-stop
$237
Typical prices: $476-$319
United Airlines
Sa 5/9Sa 5/16
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
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Expert advice
Expert advice
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Nonstop flights
You can fly direct with Southwest and United Airlines. Average duration is 3h 28m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $268 (round-trip)
Shortest trip • 7h 02m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 53% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 19% price drop
Most popular
Good to know
Good to know
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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

Do, Mai 14 - Mo, Mai 18
Frontier Logo
11:59 pm - 3:14 pm
DEN
-
IAD
13h 15m
1 stop
Frontier Logo
6:17 pm - 10:24 pm
IAD
-
DEN
30h 07m
1 stop
$179Frontier
Mi, Mai 27 - Do, Mai 28
Frontier Logo
11:54 pm - 10:12 am
DEN
-
IAD
8h 18m
1 stop
Frontier Logo
8:47 pm - 9:05 am
IAD
-
DEN
14h 18m
1 stop
$184Frontier
Mo, Mai 11 - Mo, Mai 18
Frontier Logo
11:54 pm - 10:12 am
DEN
-
IAD
8h 18m
1 stop
Frontier Logo
3:59 pm - 10:39 pm
IAD
-
DEN
8h 40m
1 stop
$185Frontier
Do, Mai 14 - Mo, Mai 18
Frontier Logo
10:00 am - 11:09 pm
DEN
-
IAD
11h 09m
1 stop
Frontier Logo
11:12 am - 10:24 pm
IAD
-
DEN
13h 12m
1 stop
$186Frontier
Mo, Mai 4 - Fr, Mai 8
Frontier Logo
11:59 pm - 10:12 am
DEN
-
IAD
8h 13m
1 stop
Frontier Logo
7:27 pm - 3:28 pm
IAD
-
DEN
22h 01m
2 stops
$187Frontier
Do, Mai 14 - Mo, Mai 18
Frontier Logo
11:54 pm - 5:12 pm
DEN
-
IAD
15h 18m
1 stop
Frontier Logo
6:17 pm - 10:24 pm
IAD
-
DEN
30h 07m
1 stop
$188Frontier
Di, Mai 26 - Fr, Mai 29
Frontier Logo
11:54 pm - 10:12 am
DEN
-
IAD
8h 18m
1 stop
Frontier Logo
8:47 pm - 9:05 am
IAD
-
DEN
14h 18m
1 stop
$189Frontier
Sa, Mai 16 - Mo, Mai 18
Frontier Logo
6:30 am - 4:21 pm
DEN
-
IAD
7h 51m
1 stop
Frontier Logo
6:17 pm - 9:12 am
IAD
-
DEN
16h 55m
2 stops
$190Frontier
Mo, Mai 4 - Sa, Mai 9
Frontier Logo
11:59 pm - 10:12 am
DEN
-
IAD
8h 13m
1 stop
Frontier Logo
6:49 am - 10:39 pm
IAD
-
DEN
17h 50m
2 stops
$191Frontier
Mo, Jun 1 - Sa, Jun 6
Frontier Logo
11:59 pm - 11:09 pm
DEN
-
IAD
21h 10m
2 stops
Frontier Logo
8:47 pm - 9:05 am
IAD
-
DEN
14h 18m
1 stop
$192Frontier
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.

How much is a round-trip flight from Denver to Washington, D.C. Dulles Intl Airport?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Denver to Washington, D.C. Dulles Intl Airport departing in May.

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 $287 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $454 and $392 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 53% 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$79
Best time to beat the crowds but there is an average 7% increase in price.
Most popular time to fly with an average 4% 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

  • 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 $79 for a one-way ticket and $179 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, American Airlines, Lufthansa, and Finnair 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 $295 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 $383 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 $231 or less one-way and $433 or less round-trip.

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 4336 reviews
7.0Food
8.1Boarding
7.5Entertainment
8.6Crew
8.0Comfort
Airline reviews

It was as expected and I was grateful for the wheel chair help and ease of use.

10.0 ExcellentAnonymous, Apr 2026
LAS - PDX
Read more Southwest reviews

It was as expected and I was grateful for the wheel chair help and ease of use.

One of the best airlines for fast boarding, on time arrivals, and top notch service!

The new seat assignment thing is wierd. If you don’t pay for a seat they always assign you a middle seat regardless of how many people are on the flight. Idk… the new company that bought Southwest is trying to make it more profitable, but I’m just not seeing it. The flight attendants aren’t having as much fun anymore. It just feels like the airline is slowly dying. IMO. We shall see if Southwest is the next Toy’s R Us.

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

Plane was late. Zero service for 2+ hour flight and it was not that bumpy.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Had a great flight. Delayed takeoff, but comfortable. Snacks were good.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

I liked that it was on time, however, the food was not good.

Offered to check carry on to final destination. This is the most absurd thing in the world. I'm carrying on because I need what is in the carry-on. I'm okay with picking up at next stop but then I will be on much larger plane that can accommodate it. Also, if there is ever a change to your flight. Go to the airport and have the people there fix your ticket. Don't do it over the phone or online with United they screwed us up and ended up with flights for our last leg that took off before our first leg.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

When I went to check in at the United counter in Barcelona, Spain I had 2 different menat 2 different times in United uniforms (standing around with a couple other employees) ask me if I was traveling alone. The one man asked me 3 different ways if I was traveling alone. I am, 68 yeaers old and have all my faculties. I thought it was weird and it made me feel very uncomfortable. What difference does it make if I was traveling alone or with someone? What if I was a recent widow? That would have been horrible. They never gave me a reason why they needed to know who I was traveling with. I was hesitant to question them because I needed to be on that flight.

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.

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

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

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

Information on your arrival and departure airports