IAD - BIL

$212 Find Cheap Flights from Washington Dulles Airport to Billings - 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 Dulles Intl to Billings departing on 8/12. 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 Billings

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

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Everything you should know

Cheapest round-trip
$315
Typical prices: $514-$1,034
Multiple Airlines
Fri 8/21Mon 8/24
IAD - BIL • 1 stop
Cheapest one-way
$212
Multiple Airlines
Wed 8/12
IAD - BIL • 3 stops
Top airlines
United Airlines
Cheapest • from $349 (round-trip)
United Airlines
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 Dulles Intl and Billings. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Denver (DEN)
Cheapest • Avg $564 (round-trip)
Chicago (ORD)
Shortest trip • 6h 51m (one-way)
Insights
Insights
Insights
Insights
When to travel
March
Cheapest • 100% price drop
June
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 Billings!
Flight Deals
Booking Insights
Flight Deals

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

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

Fri, Aug 21 - Mon, Aug 24
Multiple Airlines Logo
8:59 am - 4:55 pm
IAD
-
BIL
9h 56m
1 stop
Multiple Airlines Logo
8:58 pm - 8:04 am
BIL
-
IAD
9h 06m
1 stop
$315Multiple Airlines
Fri, Aug 21 - Mon, Aug 24
Multiple Airlines Logo
8:59 am - 4:55 pm
IAD
-
BIL
9h 56m
1 stop
Multiple Airlines Logo
8:58 pm - 10:52 pm
BIL
-
IAD
23h 54m
2 stops
$334Multiple Airlines
Tue, Sep 1 - Wed, Sep 9
United Airlines Logo
12:50 pm - 5:16 pm
IAD
-
BIL
6h 26m
1 stop
United Airlines Logo
7:00 am - 5:50 pm
BIL
-
IAD
8h 50m
1 stop
$349United Airlines
Tue, Aug 4 - Tue, Aug 18
Delta Logo
6:49 pm - 11:30 pm
IAD
-
BIL
6h 41m
1 stop
Delta Logo
6:24 pm - 11:49 am
BIL
-
IAD
15h 25m
2 stops
$354Delta
Wed, Aug 19 - Sat, Aug 22
United Airlines Logo
2:43 pm - 9:00 pm
IAD
-
BIL
8h 17m
1 stop
United Airlines Logo
5:00 am - 1:30 pm
BIL
-
IAD
6h 30m
1 stop
$370United Airlines
Sat, Aug 29 - Wed, Sep 9
Delta Logo
2:23 pm - 8:12 pm
IAD
-
BIL
7h 49m
1 stop
Delta Logo
6:20 am - 1:31 pm
BIL
-
IAD
5h 11m
1 stop
$374Delta
Wed, Aug 19 - Sat, Aug 22
United Airlines Logo
2:43 pm - 9:00 pm
IAD
-
BIL
8h 17m
1 stop
United Airlines Logo
5:00 am - 1:30 pm
BIL
-
IAD
6h 30m
1 stop
$376United Airlines
Wed, Aug 19 - Sat, Aug 22
United Airlines Logo
2:43 pm - 9:00 pm
IAD
-
BIL
8h 17m
1 stop
United Airlines Logo
5:00 am - 1:30 pm
BIL
-
IAD
6h 30m
1 stop
$378United Airlines
Wed, Aug 19 - Wed, Aug 26
Delta Logo
3:03 pm - 11:30 pm
IAD
-
BIL
10h 27m
2 stops
Delta Logo
6:24 pm - 9:20 am
BIL
-
IAD
12h 56m
2 stops
$385Delta
Sat, Aug 22 - Sun, Aug 30
United Airlines Logo
4:15 pm - 10:07 pm
IAD
-
BIL
7h 52m
1 stop
United Airlines Logo
2:29 pm - 12:32 am
BIL
-
IAD
8h 03m
1 stop
$387United Airlines
Booking Insights

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Billings, 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 Washington, D.C. Dulles Intl Airport to Billings is March, where tickets cost $0 (return) on average. On the other hand, the most expensive months are September and July, where the average cost of round-trip tickets is $825 and $764 respectively.

Find deals

Good to know

Low seasonApril
Cheapest flight$212
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly and prices are also 25% lower on average.
Flight from Washington Dulles Airport to Billings

When to book flights from Dulles Intl to Billings

Are your dates flexible? Find out the best times to travel from Dulles Intl to Billings 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 Washington Dulles Airport to Billings flights

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

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Billings was $212 for a one-way ticket and $315 for a round-trip.

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

    No, a passport isn't needed to fly from Washington Dulles Airport to Billings. However, local authorities might ask for an official ID.

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

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

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

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

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

    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 Washington Dulles Airport to Billings.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Billings from Washington Dulles Airport 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 Washington Dulles Airport to Billings?

    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 Billings with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and BIL 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 Washington Dulles Airport to Billings?

    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 Billings from Washington Dulles Airport 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 Dulles Intl to Billings

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Billings. 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 Dulles Intl to Billings? 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 9899 reviews
7.3Comfort
7.7Boarding
6.6Food
7.1Entertainment
8.1Crew
Airline reviews

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

6.0 GoodEnrique, Jun 2026
IAD - LAX
Read more United Airlines reviews

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

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

Information on your arrival and departure airports

Washington Dulles Airport (IAD)
Billings (BIL)