$359 Find Cheap Flights from Washington Dulles Airport to Belfast

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 Belfast departing on 5/11. 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 Belfast

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Belfast, 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 Belfast, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$831
Multiple Airlines
Wed 5/13Wed 5/20
IAD - BFS • 2 stops
Cheapest one-way
$359
Multiple Airlines
Mon 5/11
IAD - BFS • 3 stops
Top airlines
British Airways
Cheapest • from $971 (round-trip)
British Airways
Best reviews • 6.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Dulles Intl to Belfast (IAD-BHD)

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

Wed, May 13 - Wed, May 20
Multiple Airlines Logo
9:55 am - 5:05 pm
IAD
-
BFS
26h 10m
2 stops
Multiple Airlines Logo
8:20 am - 8:35 pm
BFS
-
IAD
41h 15m
3 stops
$831Multiple Airlines
Tue, Aug 25 - Sun, Sep 6
Multiple Airlines Logo
8:30 pm - 10:15 pm
IAD
-
BFS
20h 45m
2 stops
Multiple Airlines Logo
8:20 pm - 3:10 pm
BFS
-
IAD
47h 50m
3 stops
$904Multiple Airlines
Tue, Aug 25 - Sun, Sep 6
Multiple Airlines Logo
8:30 pm - 11:20 pm
IAD
-
BFS
21h 50m
3 stops
Multiple Airlines Logo
8:20 pm - 8:35 pm
BFS
-
IAD
29h 15m
3 stops
$933Multiple Airlines
Fri, Sep 4 - Tue, Sep 15
Multiple Airlines Logo
8:20 pm - 9:00 pm
IAD
-
BFS
19h 40m
2 stops
Multiple Airlines Logo
10:30 pm - 3:10 pm
BFS
-
IAD
45h 40m
3 stops
$942Multiple Airlines
Sun, May 24 - Mon, May 25
Multiple Airlines Logo
3:45 pm - 6:50 pm
IAD
-
BFS
22h 05m
3 stops
Multiple Airlines Logo
9:05 pm - 3:10 pm
BFS
-
IAD
47h 05m
3 stops
$943Multiple Airlines
Sat, Apr 11 - Tue, Apr 14
Multiple Airlines Logo
8:30 pm - 9:30 pm
IAD
-
BFS
20h 00m
2 stops
Multiple Airlines Logo
8:50 am - 8:35 pm
BFS
-
IAD
40h 45m
3 stops
$948Multiple Airlines
Wed, Sep 2 - Mon, Oct 12
British Airways Logo
9:30 pm - 3:40 pm
IAD
-
BHD
13h 10m
1 stop
British Airways Logo
7:35 pm - 5:25 pm
BHD
-
IAD
26h 50m
1 stop
$971British Airways
Tue, May 12 - Wed, Jan 13
British Airways Logo
10:25 pm - 4:15 pm
IAD
-
BHD
12h 50m
1 stop
British Airways Logo
9:15 am - 3:35 pm
BHD
-
IAD
11h 20m
1 stop
$997British Airways
Wed, Sep 2 - Mon, Oct 12
KLM Logo
12:30 pm - 9:20 am
IAD
-
BHD
15h 50m
2 stops
KLM Logo
5:30 pm - 3:35 pm
BHD
-
IAD
27h 05m
1 stop
$1,000KLM
Tue, May 12 - Wed, Jan 13
Delta Logo
7:33 pm - 4:55 pm
IAD
-
BHD
16h 22m
2 stops
Delta Logo
6:30 am - 4:30 pm
BHD
-
IAD
15h 00m
2 stops
$1,023Delta
Booking Insights

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

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

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

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Washington Dulles Airport to Belfast were found on British Airways ($971) and KLM ($1,000).

Find deals

Good to know

Cheapest flight$359
Flight from Washington Dulles Airport to Belfast Intl Airport

When to book flights from Dulles Intl to Belfast

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

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Belfast was $359 for a one-way ticket and $831 for a round-trip.

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

    Yes, you’ll need a passport to travel to Belfast from Washington Dulles Airport.

  • Which airports will I be using when flying from Washington Dulles Airport to Belfast?

    Washington Dulles Airport is served by only 1 airport and there are 2 airports in Belfast. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and you will be arriving in Belfast at one of these airports: Belfast Intl or Belfast City.

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

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

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

    oneworld is the only airline alliance operating flights between Washington Dulles Airport and Belfast.

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

    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 Belfast.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Belfast 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 Belfast?

    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 Belfast with an airline and back to Washington Dulles Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to Belfast?

    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 Belfast 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 Belfast

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Belfast. 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 Belfast? 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.
6.7
British AirwaysOverall score based on 7841 reviews
6.9Boarding
7.6Crew
6.4Entertainment
6.4Food
6.8Comfort
Airline reviews

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

8.0 ExcellentDarlene, Mar 2026
DEN - LHR
Read more British Airways reviews

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

Wish the food and overall service was better. They treat Business class passengers same as economy

WiFi wasn’t available to economy until the end of the flight.

Very good staff members with sincere passion and responsibility in their job.

Very please with the seating that the Kayak staff booked for us!

Worth every penny to upgrade to BC. Treated and felt more like First Class

Good service, food and comfort in World Traveller Plus. Entertainment was poor - no wifi on the way out and barely working on the way back. Not a great choice of entertainment on the seat back tv.

They had us seating down for one hour just waiting on the plane

Flying with BA is always a good experience—even in economy class. It is better if in business and first class. Timely, breeze through security and timely connections

We waited at BOS at the gate for an hour and couldn’t get a drink or anything. Once in the air the service, food and ride was excellent.

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

Information on your arrival and departure airports

Washington Dulles Airport (IAD)