BIL - IAD

$175 Find Cheap Flights from Billings 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 Billings to Dulles Intl departing on 9/19. 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 Billings 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 Billings to Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$349
United Airlines
Sat 8/22Sun 8/30
BIL - IAD • 1 stop
Cheapest one-way
$175
Alaska Airlines
Sat 9/19
BIL - IAD • 1 stop
Top airlines
Cheapest • from $349 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Billings and Dulles Intl. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $553 (round-trip)
Shortest trip • 7h 11m (one-way)
Insights
Insights
Insights
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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
Flight Deals

Cheap Flights from Billings to Dulles Intl (BIL-IAD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Billings 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 Billings to Dulles Intl

Sat, Aug 22 - Sun, Aug 30
United Airlines Logo
5:00 am - 1:30 pm
BIL
-
IAD
6h 30m
1 stop
United Airlines Logo
5:26 pm - 10:51 pm
IAD
-
BIL
7h 25m
1 stop
$349United Airlines
Tue, Aug 18 - Wed, Aug 26
Delta Logo
6:24 pm - 9:20 am
BIL
-
IAD
12h 56m
2 stops
Delta Logo
6:49 pm - 11:30 pm
IAD
-
BIL
6h 41m
1 stop
$354Delta
Tue, Aug 18 - Wed, Aug 26
Delta Logo
6:24 pm - 11:49 am
BIL
-
IAD
15h 25m
2 stops
Delta Logo
12:29 pm - 10:25 pm
IAD
-
BIL
11h 56m
2 stops
$359Delta
Thu, Aug 13 - Fri, Aug 21
United Airlines Logo
2:29 pm - 12:32 am
BIL
-
IAD
8h 03m
1 stop
United Airlines Logo
5:26 pm - 10:51 pm
IAD
-
BIL
7h 25m
1 stop
$369United Airlines
Fri, Sep 4 - Tue, Sep 8
Delta Logo
6:24 pm - 11:49 am
BIL
-
IAD
15h 25m
2 stops
Delta Logo
7:00 am - 12:17 pm
IAD
-
BIL
7h 17m
1 stop
$379Delta
Thu, Nov 12 - Sun, Nov 15
Delta Logo
6:15 am - 4:17 pm
BIL
-
IAD
8h 02m
2 stops
Delta Logo
7:30 am - 5:49 pm
IAD
-
BIL
12h 19m
2 stops
$385Delta
Tue, Aug 18 - Wed, Aug 26
United Airlines Logo
2:29 pm - 11:19 pm
BIL
-
IAD
6h 50m
1 stop
United Airlines Logo
5:26 pm - 10:51 pm
IAD
-
BIL
7h 25m
1 stop
$388United Airlines
Tue, Aug 18 - Tue, Aug 25
Delta Logo
6:33 pm - 9:20 am
BIL
-
IAD
12h 47m
2 stops
Delta Logo
6:49 pm - 11:30 pm
IAD
-
BIL
6h 41m
1 stop
$390Delta
Tue, Aug 18 - Tue, Aug 25
Delta Logo
6:33 pm - 9:20 am
BIL
-
IAD
12h 47m
2 stops
Delta Logo
5:25 pm - 11:30 pm
IAD
-
BIL
8h 05m
2 stops
$395Delta
Thu, Sep 24 - Mon, Sep 28
Delta Logo
6:33 pm - 11:45 am
BIL
-
IAD
15h 12m
2 stops
Delta Logo
6:47 pm - 11:11 pm
IAD
-
BIL
6h 24m
1 stop
$404Delta
Booking Insights

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

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

Which airlines provide the cheapest flights from Billings to Washington Dulles Airport?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from Billings to Washington Dulles Airport were found on United Airlines ($349) and Delta ($354).

Good to know

Cheapest flight$175
Flight from Billings to Washington Dulles Airport

When to book flights from Billings to Dulles Intl

Are your dates flexible? Find out the best times to travel from Billings 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.

FAQs for booking Billings to Washington Dulles Airport flights

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

    In the last 5 days, the lowest price for a flight from Billings to Washington, D.C. Dulles Intl Airport was $175 for a one-way ticket and $349 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

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

    We unfortunately don’t have that data for this specific route.

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

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

  • How does KAYAK find such low prices on flights from Billings 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 Billings to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Billings 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 Billings 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 Billings 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 Billings with another airline. Booking your flights between Billings 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 Billings 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 Billings up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Billings to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Billings 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 Billings 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.
7.4
United AirlinesOverall score based on 9842 reviews
7.7Boarding
6.6Food
7.3Comfort
7.1Entertainment
8.1Crew
Airline reviews

Our flight was delayed 2.5 hours from Lisbon to DC so we missed our connection to Seattle that would have arrived at about 9 PM. The agent initially said we had to stay overnight in DC and there were no other options to put us on to get us to Seattle. While on board I discovered a flight via American he could have put us in but by the time we arrived in DC that was sold out. We were then put on a flight to San Francisco that was also delayed then arrived in San Francisco and our flight to Seattle was also delayed so we ended up not arriving until 2:15 am. Our son could not pick us up so we ended up having to pay over $100 to Uber home. This is the second trip with United that the flight has been delayed causing us to miss an evening in Las Vegas and we were given nothing.

2.0 MediocreLinda, Jun 2026
LIS - IAD
Read more United Airlines reviews

Our flight was delayed 2.5 hours from Lisbon to DC so we missed our connection to Seattle that would have arrived at about 9 PM. The agent initially said we had to stay overnight in DC and there were no other options to put us on to get us to Seattle. While on board I discovered a flight via American he could have put us in but by the time we arrived in DC that was sold out. We were then put on a flight to San Francisco that was also delayed then arrived in San Francisco and our flight to Seattle was also delayed so we ended up not arriving until 2:15 am. Our son could not pick us up so we ended up having to pay over $100 to Uber home. This is the second trip with United that the flight has been delayed causing us to miss an evening in Las Vegas and we were given nothing.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

There were no facilities in the middle of the aircraft and premium economy was not allowed to use the business class facilities, and had to share the only two toilets at the back with economy. The upgrade to Premium was definitely not worth it

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

The economy seat was much less comfortable for an international flight in terms of recline and moving space when food tray is expanded. Per entertainment, it would be amazing if I could connect my Bluetooth headset or ear phones to the entertainment screen. Or provide in-flight wifi to connect directly from my own device.

We were a little disappointed to not be able to complete check in online without uploading pics of passports. Also we have KTN's and they weren't on our boarding passes when we got to security. Had to trek back to counter to have them fix.

Excellent service in Polaris class IAD to ZRH. Arrived rested and well fed after the overnight flight.

It's a short hop. My carryon was checked at the gate, I didn't have to drag it all over the airport. Excellent wheelchair assist.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Terrific in every way. On time, professional staff, multiple movie options to select, great food and drink.

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

Information on your arrival and departure airports