$275 Find Cheap Flights from Washington Dulles Airport to Belfast - 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 Belfast departing on 7/17. 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

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Everything you should know

Cheapest round-trip
$786
Multiple Airlines
Wed 8/26Mon 8/31
IAD - BFS • 3 stops
Cheapest one-way
$275
Multiple Airlines
Fri 7/17
IAD - BFS • 3 stops
Top airlines
Cheapest • from $960 (round-trip)
Best reviews • 6.7 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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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, Aug 26 - Mon, Aug 31
Multiple Airlines Logo
8:30 pm - 11:15 pm
IAD
-
BFS
21h 45m
3 stops
Multiple Airlines Logo
8:40 am - 3:10 pm
BFS
-
IAD
35h 30m
3 stops
$786Multiple Airlines
Wed, Aug 26 - Mon, Aug 31
Multiple Airlines Logo
4:20 pm - 7:15 pm
IAD
-
BFS
21h 55m
2 stops
Multiple Airlines Logo
8:40 am - 3:10 pm
BFS
-
IAD
35h 30m
3 stops
$806Multiple Airlines
Wed, Aug 12 - Wed, Aug 19
Multiple Airlines Logo
9:45 am - 7:15 pm
IAD
-
BFS
28h 30m
3 stops
Multiple Airlines Logo
8:15 pm - 3:10 pm
BFS
-
IAD
47h 55m
3 stops
$848Multiple Airlines
Wed, Sep 16 - Tue, Sep 29
Multiple Airlines Logo
8:30 pm - 5:05 pm
IAD
-
BFS
15h 35m
2 stops
Multiple Airlines Logo
2:50 pm - 7:25 pm
BFS
-
IAD
33h 35m
2 stops
$857Multiple Airlines
Sun, Jul 19 - Wed, Jul 22
Multiple Airlines Logo
8:30 pm - 11:10 pm
IAD
-
BFS
21h 40m
3 stops
Multiple Airlines Logo
10:45 pm - 9:13 pm
BFS
-
IAD
27h 28m
3 stops
$880Multiple Airlines
Sun, Jul 19 - Wed, Jul 22
Multiple Airlines Logo
8:30 pm - 11:10 pm
IAD
-
BFS
21h 40m
3 stops
Multiple Airlines Logo
10:45 pm - 9:26 pm
BFS
-
IAD
27h 41m
2 stops
$884Multiple Airlines
Sun, Aug 16 - Sun, Aug 30
Multiple Airlines Logo
5:40 pm - 9:50 pm
IAD
-
BFS
23h 10m
2 stops
Multiple Airlines Logo
10:10 pm - 3:10 pm
BFS
-
IAD
46h 00m
3 stops
$885Multiple Airlines
Wed, Sep 16 - Tue, Sep 29
Multiple Airlines Logo
8:30 pm - 5:05 pm
IAD
-
BFS
15h 35m
2 stops
Multiple Airlines Logo
6:20 pm - 10:15 pm
BFS
-
IAD
32h 55m
3 stops
$891Multiple Airlines
Thu, Oct 29 - Sun, Nov 8
British Airways Logo
10:45 pm - 2:00 pm
IAD
-
BHD
11h 15m
1 stop
British Airways Logo
9:10 am - 3:35 pm
BHD
-
IAD
11h 25m
1 stop
$960British Airways
Mon, Sep 28 - Fri, Oct 2
British Airways Logo
10:25 pm - 5:30 pm
IAD
-
BHD
14h 05m
1 stop
British Airways Logo
12:00 pm - 8:20 pm
BHD
-
IAD
13h 20m
1 stop
$973British Airways
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 5 days.

In the past 5 days, the cheapest round-trip tickets from Washington Dulles Airport to Belfast were found on British Airways ($960) and Delta ($1,006).

Good to know

Cheapest flight$275
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 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Belfast was $275 for a one-way ticket and $786 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 8091 reviews
6.8Comfort
6.9Boarding
6.4Entertainment
6.4Food
7.7Crew
Airline reviews

Horrible… I was downgraded without notice, had to sit in economy and given my back injury was in pain most of the journey. I expect to be reimbursed for this inconvenience and after my return flight home, I never plan to fly with British Airways again.

2.0 MediocreOlga, Sep 2025
IAD - LHR
Read more British Airways reviews

Horrible… I was downgraded without notice, had to sit in economy and given my back injury was in pain most of the journey. I expect to be reimbursed for this inconvenience and after my return flight home, I never plan to fly with British Airways again.

I like the crew, very welcoming. Food can be better. The seat arms don’t go up so. I could use the empty seat next to mine to relax better. 3hrs delay 😠

I enjoyed the comfort of Premium Economy. The Purser on London-Nairobi was a little testy, snappish in his tone. I understand stressed, tired, etc but his tone in addressing passengers I found wanting.

The flight was delayed twice and because of that, we missed our connecting flight. British Airways then attempted to put us on the last flight to Milan from London which would have kept us in the airport for 12 hours. We had to speak to several levels of bureaucracy until BA management let us fly on a flight that only kept us in the airport for two hours. If there was an earlier flight, why weren’t we put on that flight from the start? Unacceptable behavior from what was once my favorite carrier.

everything to do with KAYAK was terrible. Your customer facing departments are utterly useless, timewasting and unhelpful.

Nice flight, attentive crew, soft landing by the Pilot,, comfortable seat.

Service was very good. Because I use a cane, I was allowed to use Priority Boarding. Biggest problem was extremely limited leg room in Economy class seats. For airplane food, it was alright.

Great job notifying of 30 minute delay in departure. Fabulous job making up for the time and arriving as scheduled. Air travel is just no fun anymore with the extreme overcrowding, and someone needs to come up with an innovative plan for loading and unloading passengers (load all window seats first, middle seats second, aisle seats last?). Great job getting the luggage on the carousel in record time!

One frustration after another. No gate personnel until very close to departure. Boarding procedure was chaos. Plane was dirty from previous transatlantic flight. Entertainment system not operational. Gate change for connecting flight which required another round of security clearance, almost causing a missed flight. The final blow was lost baggage upon arrival.

Nothing. BA flight was late. Missed connection and lost luggage. A disaster.

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

Information on your arrival and departure airports