DEN - IAD

$116 Find Cheap Flights from Denver to Washington Dulles Airport - Compare and Save

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Everything you should know

Cheapest round-trip
$225
Typical prices: $306-$553
Frontier
Tue 9/25Fri 9/28
DEN - IAD • 1 stop
Cheapest non-stop
$314
Typical prices: $313-$560
United Airlines
Wed 9/12Thu 9/13
DEN - IAD • Non-stop
Advice from real travelers
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
+1
Expert advice
+1
Nonstop flights
You can fly direct with United Airlines. Average duration is 3h 25m
Direct flights
+1
Direct flights
+1
When to book
in advance
Our data shows that travelers who book at least 10 weeks in advance save around 46% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 28% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg $286 (round-trip)
Shortest trip • 5h 06m (one-way)
Insights
Insights
Start a new search
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We hope you love your trip to Washington, D.C. Dulles Intl Airport!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Denver to Dulles Intl

Mon, Sep 7 - Wed, Sep 9
Frontier Logo
10:45 pm - 5:01 amDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
28h 16m1 stop Las Vegas Harry Reid Intl
Frontier Logo
6:35 am - 12:51 pmIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
8h 16m1 stop Las Vegas Harry Reid Intl
$225Frontier
Fri, Sep 4 - Mon, Sep 7
Frontier Logo
6:30 am - 5:14 pmDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
8h 44m1 stop Atlanta Hartsfield-Jackson
Frontier Logo
8:59 am - 3:48 amIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
20h 49m1 stop Las Vegas Harry Reid Intl
$225Frontier
Fri, Sep 25 - Mon, Sep 28
Frontier Logo
9:19 pm - 11:33 amDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
12h 14m1 stop Dallas/Fort Worth
Frontier Logo
7:50 am - 9:39 pmIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
15h 49m2 stops Atlanta Hartsfield-Jackson Lambert-St Louis
$225Frontier
Mon, Sep 21 - Thu, Oct 8
Frontier Logo
9:19 pm - 3:34 pmDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
16h 15m1 stop Dallas/Fort Worth
Frontier Logo
7:36 am - 9:31 pmIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
15h 55m1 stop Atlanta Hartsfield-Jackson
$225Frontier
Mon, Sep 14 - Mon, Sep 14
Multiple Airlines Logo
6:40 am - 5:56 pmDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
9h 16m2 stops Orlando Blountville Tri Cities TN/VA
Multiple Airlines Logo
9:04 pm - 8:04 amIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
13h 00m1 stop Atlanta Hartsfield-Jackson
$254Multiple Airlines
Wed, Oct 14 - Mon, Oct 19
Delta Logo
12:59 am - 10:12 amDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
7h 13m1 stop Detroit Metropolitan Wayne County
Delta Logo
4:48 pm - 9:51 pmIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
7h 03m1 stop Atlanta Hartsfield-Jackson
$255Delta
Sat, Oct 10 - Sun, Oct 11
Delta Logo
6:20 am - 4:16 pmDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
7h 56m1 stop Detroit Metropolitan Wayne County
Delta Logo
6:05 am - 9:32 amIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
5h 27m1 stop Detroit Metropolitan Wayne County
$255Delta
Fri, Nov 13 - Sat, Nov 14
United Airlines Logo
11:59 pm - 5:19 amDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
3h 20mnonstop
United Airlines Logo
8:20 am - 10:29 amIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
4h 09mnonstop
$314United Airlines
Sat, Nov 14 - Sun, Nov 15
United Airlines Logo
11:59 pm - 5:19 amDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
3h 20mnonstop
United Airlines Logo
8:20 am - 10:29 amIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
4h 09mnonstop
$314United Airlines
Sat, Sep 12 - Sun, Sep 13
United Airlines Logo
11:59 pm - 5:25 amDEN  Denver Intl-IAD Washington, D.C. Dulles Intl
3h 26mnonstop
United Airlines Logo
6:30 am - 8:24 amIAD  Washington, D.C. Dulles Intl-DEN Denver Intl
3h 54mnonstop
$314United Airlines
Booking Insights

Price, demand and travel trends for Denver to Washington, D.C. Dulles Intl Airport flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Denver to Washington, D.C. Dulles Intl Airport with more confidence.

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

Round-trip flights from Denver to Washington, D.C. Dulles Intl Airport start at $225. Prices are below average for this route right now, with typical round-trip fares ranging from $306 to $553. The lowest price found in the past 5 days was $225 on Frontier.

What's the cheapest day of the week to fly from Denver to Washington, D.C. Dulles Intl Airport?

Thursday is the cheapest day of the week to fly from Denver to Washington, D.C. Dulles Intl Airport, it is 14% cheaper than the average day. Monday is the most expensive day with flight prices 31% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • October is the cheapest month to fly from Denver to Washington, D.C. Dulles Intl Airport at $303 round-trip.
  • July ($516) and June ($510) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 70% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are prices from Denver to Washington, D.C. Dulles Intl Airport the cheapest?

Flights from Denver to Washington, D.C. Dulles Intl Airport are cheapest 10 weeks before departure. Booking in this window typically costs about 46% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Expert advice

Expert advice for your flight from Denver to Dulles Intl

 
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.

Key details for Denver to Washington, D.C. Dulles Intl Airport flights

Low season

September

Cheapest flight

$116
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Denver to Washington, D.C. Dulles Intl 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

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-Feb 2026
Get a seat in the very front if you can, otherwise, it is a very slow process.
JasonFlew with United Airlines-Nov 2024
DIA is a large airport. Get there early.
BindulFlew with United Airlines-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.

Your Denver to Washington, D.C. Dulles Intl Airport flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • 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.

  • Which airlines offer extra legroom and free seat selection on Denver to Washington, D.C. Dulles Intl Airport flights?

    Among airlines operating Denver to Washington, D.C. Dulles Intl Airport flights:

    • United Airlines: offers extra legroom; offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • What airlines are available from Denver to Washington, D.C. Dulles Intl Airport?

    Only United Airlines operates flights between Denver and Washington, D.C. Dulles Intl Airport.

  • Which airports can I use when flying from Denver to Washington, D.C. Dulles Intl Airport?

    Flights from Denver to Washington, D.C. Dulles Intl Airport usually depart from Denver Intl (DEN) and arrive at Washington, D.C. Dulles Intl (IAD).

  • Which airlines include bags at no extra cost on Denver to Washington, D.C. Dulles Intl Airport flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • United Airlines: a cabin bag and a checked bag in Economy Class
    • JetBlue: a cabin bag in Economy Class class

    Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

  • What cabin classes can I book on flights from Denver to Washington, D.C. Dulles Intl Airport?

    Four cabin classes are available on flights from Denver to Washington, D.C. Dulles Intl Airport:

    • Economy Class
    • Premium Economy Class
    • Business Class
    • First Class

    Prices vary by airline.

  • How much can I save by taking a layover when flying from Denver to Washington, D.C. Dulles Intl Airport?

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $286 round-trip via Atlanta Hartsfield-Jackson (ATL), compared to $433 for nonstop.

  • What is the standard checked-bag allowance on flights from Denver to Washington, D.C. Dulles Intl Airport?

    There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $40–$80 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from Denver to Washington, D.C. Dulles Intl Airport?

    The Airbus A321neo family is used most often on this route, operated mainly by United Airlines. Other aircraft seen on the route include Boeing 737-900 variants.

  • Which airports do connecting flights from Denver to Washington, D.C. Dulles Intl Airport pass through?

    One-stop flights from Denver to Washington, D.C. Dulles Intl Airport most commonly connect through:

    • Atlanta Hartsfield-Jackson (ATL) - 72% of one-stop connections
    • Orlando (MCO) - 9% of one-stop connections
    • Tampa (TPA) - 7% of one-stop connections
    • Dallas/Fort Worth (DFW) - 4% of one-stop connections

    Atlanta Hartsfield-Jackson (ATL) handles the largest share of one-stop connections on this route.

  • Can I save money by using flexible dates for flights from Denver to Washington, D.C. Dulles Intl Airport?

    Yes. Being flexible with your travel dates can save you up to 35% on the Denver to Washington, D.C. Dulles Intl Airport route. Thursday is the cheapest departure day at $366 round-trip on average, while Monday is the most expensive at $557, a difference of $191. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How are flight departures from Denver to Washington, D.C. Dulles Intl Airport spread across the day?

    Morning is the busiest departure period on Denver to Washington, D.C. Dulles Intl Airport flights, with 38% of flights leaving in that window. Afternoon departures account for 38%, evening flights for 12%, and night flights for 12%.

  • What popular places can I visit in Washington, D.C. Dulles Intl Airport?

    Some of the most popular sights in Washington, D.C. Dulles Intl Airport are Walter E. Washington Convention Center, National Mall and Capital One Arena. These are among the most viewed places in Washington, D.C. Dulles Intl Airport on KAYAK.

  • What are the earliest and latest flights from Denver to Washington, D.C. Dulles Intl Airport?

    These are the earliest and latest flight times available from Denver to Washington, D.C. Dulles Intl Airport:

    • Earliest: departs at 6:00 am and lands at 9:25 am
    • Latest: departs at 11:59 pm and lands at 3:24 am.

    The flight takes about 3h 25m.

  • How expensive are last-minute Denver to Washington, D.C. Dulles Intl Airport flights?

    Last-minute fares on this route - booked within 2 weeks of departure - run 49% above the route average of $423. Book 10 weeks before departure for the lowest fares.

  • How long is a flight from Denver to Washington, D.C. Dulles Intl Airport?

    A nonstop flight from Denver to Washington, D.C. Dulles Intl Airport takes 3h 25m, covering 1,448 miles.

  • Do I need a passport to fly from Denver to Washington, D.C. Dulles Intl Airport?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

  • Have flight prices from Denver to Washington, D.C. Dulles Intl Airport changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $225 to $2,020. That means the highest observed fare was about 9x higher than the lowest one.

  • How are flight prices from Denver to Washington, D.C. Dulles Intl Airport looking right now?

    One-way fares from Denver to Washington, D.C. Dulles Intl Airport are currently lower than usual. Average one-way flight prices are about $143, which is 45% below the typical average for this route.

  • How much time can I save by choosing a different layover airport from Denver to Washington, D.C. Dulles Intl Airport?

    Flying via Kansas City (MCI) gives the shortest average 1-stop total travel time at 5h 06m, compared with 7h 31m via Dallas/Fort Worth (DFW) and 8h 08m via Charlotte Douglas (CLT).

  • What is the time difference between Denver and Washington, D.C. Dulles Intl Airport?

    Washington, D.C. Dulles Intl Airport is 2 hours ahead of Denver (Eastern Time vs Mountain Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Washington, D.C. Dulles Intl Airport (IAD)?

    Washington, D.C. Dulles Intl Airport (IAD) hosts 5 major car rental companies, with daily rates starting from around $24 for economy cars. Top options include:
    · Dollar
    · Budget
    · Hertz
    · Sixt
    · Thrifty

  • How much should I expect to pay for a Denver to Washington, D.C. Dulles Intl Airport flight?

    Round-trip flights from Denver to Washington, D.C. Dulles Intl Airport range from $306 to $553, with an average of $423 over the past 12 months. Anything below $306 counts as a good deal.

  • Which airlines offer Wi-Fi on Denver to Washington, D.C. Dulles Intl Airport flights?

    JetBlue is the only airline on the Denver to Washington, D.C. Dulles Intl Airport route offering in-flight Wi-Fi. Pricing depends on fare class.

Your guide to booking Denver to Washington, D.C. Dulles Intl Airport flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Thursday departure instead of Monday. On this route, Thursday flights average $366 - about $191 less than Monday (34% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 10 weeks before you fly. On this route, that window historically saves about 46% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Denver to Washington, D.C. Dulles Intl Airport trip for October. Fares historically average $303 round-trip in that month - typically $213 less than the most expensive month, which is July (based on the last 12 months).
  • If you have the time, taking a 1-stop flight through Atlanta Hartsfield-Jackson Airport (ATL) can be cheaper than flying direct. The cheapest layover option averages $286 round-trip on this route - about $147 less than direct flights (based on the last 12 months).
  • 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?

 
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