DEN - IAD

$164 Find Cheap Flights from Denver to Washington Dulles Airport - Compare and Save

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 8/15. 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

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$285
Typical prices: $248-$498
Frontier
Thu 9/10Sun 9/20
DEN - IAD • 2 stops
Cheapest non-stop
$309
Typical prices: $279-$517
United Airlines
Fri 8/14Sat 8/22
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 Economy Plus adds up to 6 inches more legroom than standard economy.
Southwest free carry-on beats bag fees elsewhere, but checked bags now cost extra.
Expert advice
Expert advice
+1
+1
Expert advice
Expert advice
+1
Nonstop flights
You can fly direct with United Airlines. Average duration is 3h 29m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $324 (round-trip)
Shortest trip • 7h 17m (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 48% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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

Thu, Sep 10 - Sun, Sep 20
Frontier Logo
8:40 am - 12:28 am
DEN
-
IAD
13h 48m
2 stops
Frontier Logo
1:35 pm - 8:04 pm
IAD
-
DEN
8h 29m
1 stop
$285Frontier
Mon, Sep 14 - Sun, Sep 20
Frontier Logo
8:40 am - 12:28 am
DEN
-
IAD
13h 48m
2 stops
Frontier Logo
1:35 pm - 8:04 pm
IAD
-
DEN
8h 29m
1 stop
$286Frontier
Thu, Sep 17 - Sun, Sep 20
Frontier Logo
10:30 am - 12:28 am
DEN
-
IAD
11h 58m
1 stop
Frontier Logo
9:21 am - 10:59 pm
IAD
-
DEN
15h 38m
1 stop
$288Frontier
Wed, Jul 29 - Fri, Jul 31
Frontier Logo
4:25 pm - 8:20 am
DEN
-
IAD
13h 55m
1 stop
Frontier Logo
12:28 pm - 10:29 pm
IAD
-
DEN
12h 01m
1 stop
$289Frontier
Fri, Oct 9 - Sun, Oct 11
Frontier Logo
10:30 am - 12:28 am
DEN
-
IAD
11h 58m
1 stop
Frontier Logo
8:00 pm - 11:04 pm
IAD
-
DEN
29h 04m
1 stop
$290Frontier
Fri, Aug 7 - Sun, Aug 9
Multiple Airlines Logo
6:30 am - 5:14 pm
DEN
-
IAD
8h 44m
1 stop
Multiple Airlines Logo
3:27 pm - 2:31 pm
IAD
-
DEN
25h 04m
1 stop
$292Multiple Airlines
Sun, Jul 26 - Fri, Jul 31
Frontier Logo
10:29 pm - 8:20 am
DEN
-
IAD
7h 51m
1 stop
Frontier Logo
12:28 pm - 10:29 pm
IAD
-
DEN
12h 01m
1 stop
$295Frontier
Fri, Sep 4 - Mon, Sep 7
Frontier Logo
6:30 am - 5:14 pm
DEN
-
IAD
8h 44m
1 stop
Frontier Logo
7:24 pm - 12:15 am
IAD
-
DEN
6h 51m
1 stop
$298Frontier
Tue, Jul 28 - Thu, Jul 30
Frontier Logo
10:09 am - 8:53 pm
DEN
-
IAD
8h 44m
1 stop
Frontier Logo
9:50 am - 9:41 pm
IAD
-
DEN
13h 51m
1 stop
$299Frontier
Tue, Jul 28 - Fri, Jul 31
Frontier Logo
11:52 pm - 10:16 am
DEN
-
IAD
8h 24m
1 stop
Frontier Logo
12:28 pm - 10:29 pm
IAD
-
DEN
12h 01m
1 stop
$301Frontier
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 September.

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 Monday, 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 February, where tickets cost $322 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $516 and $502 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.

No, with an average price for the route of $488, prices are generally cheapest when you fly direct.

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 12 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 season

January

Cheapest flight

$164
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 19% 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 5 days, the lowest price for a flight from Denver to Washington, D.C. Dulles Intl Airport was $164 for a one-way ticket and $285 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, and American Airlines 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 737-900 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 $333 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 $472 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 $273 or less one-way and $530 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

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Denver Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

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

Information on your arrival and departure airports