$350 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 9/18. 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
$823
Multiple Airlines
Sun 10/25Sun 11/1
IAD - BFS • 2 stops
Cheapest one-way
$350
Multiple Airlines
Fri 9/18
IAD - BFS • 2 stops
Top airlines
British Airways
Cheapest • from $978 (round-trip)
British Airways
Best reviews • 6.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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

Sun, Oct 25 - Sun, Nov 1
Multiple Airlines Logo
8:40 pm - 8:05 pm
IAD
-
BFS
19h 25m
2 stops
Multiple Airlines Logo
7:30 am - 6:45 pm
BFS
-
IAD
40h 15m
3 stops
$823Multiple Airlines
Fri, Sep 11 - Wed, Sep 16
Multiple Airlines Logo
11:20 pm - 9:50 pm
IAD
-
BFS
17h 30m
2 stops
Multiple Airlines Logo
8:30 am - 8:35 pm
BFS
-
IAD
41h 05m
3 stops
$856Multiple Airlines
Fri, Sep 11 - Wed, Sep 16
Multiple Airlines Logo
8:15 am - 9:50 pm
IAD
-
BFS
32h 35m
3 stops
Multiple Airlines Logo
8:30 am - 3:10 pm
BFS
-
IAD
35h 40m
3 stops
$910Multiple Airlines
Sun, May 31 - Wed, Jun 10
Multiple Airlines Logo
8:18 am - 9:00 pm
IAD
-
BFS
31h 42m
3 stops
Multiple Airlines Logo
8:30 am - 8:35 pm
BFS
-
IAD
41h 05m
3 stops
$937Multiple Airlines
Sun, May 31 - Wed, Jun 10
Multiple Airlines Logo
8:25 am - 9:00 pm
IAD
-
BFS
31h 35m
2 stops
Multiple Airlines Logo
8:30 am - 8:35 pm
BFS
-
IAD
41h 05m
3 stops
$939Multiple Airlines
Sun, Oct 11 - Wed, Oct 14
British Airways Logo
5:45 pm - 10:30 am
IAD
-
BHD
11h 45m
1 stop
British Airways Logo
10:05 am - 5:25 pm
BHD
-
IAD
12h 20m
1 stop
$978British Airways
Sun, Oct 25 - Sun, Nov 1
British Airways Logo
10:45 pm - 4:50 pm
IAD
-
BHD
14h 05m
1 stop
British Airways Logo
6:30 am - 7:55 pm
BHD
-
IAD
18h 25m
1 stop
$1,004British Airways
Sun, Aug 9 - Wed, Aug 19
British Airways Logo
7:15 pm - 2:35 pm
IAD
-
BHD
14h 20m
1 stop
British Airways Logo
8:35 pm - 3:55 pm
BHD
-
IAD
24h 20m
1 stop
$1,015British Airways
Fri, Sep 11 - Wed, Sep 16
British Airways Logo
5:45 pm - 8:35 pm
IAD
-
BHD
21h 50m
1 stop
British Airways Logo
6:30 am - 7:40 pm
BHD
-
IAD
18h 10m
1 stop
$1,028British Airways
Mon, Aug 10 - Wed, Aug 19
Delta Logo
5:42 pm - 4:55 pm
IAD
-
BHD
18h 13m
2 stops
Delta Logo
5:30 pm - 3:35 pm
BHD
-
IAD
27h 05m
1 stop
$1,070Delta
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 ($978) and Delta ($1,070).

Find deals

Good to know

Cheapest flight$350
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 $350 for a one-way ticket and $823 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 7989 reviews
7.7Crew
6.4Food
6.8Comfort
6.4Entertainment
6.9Boarding
Airline reviews

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

2.0 MediocreA&J, May 2026
PIT - LHR
Read more British Airways reviews

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

Flight was good but temp in the cabin was cold.

I like American Airlines and their safety record. They provide quality service and a feel safe enough to prefer American Airlines over other carriers even if I have to pay a little more.

Cancelled flight and re booked seats were a downgrade. British Airways said the upgrade was t available but when I checked it was but then they wouldn’t make it right

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

The whole experience was excellent, O can say out from Miami the best airline to travel with for any European destination. Since the ground staff to the inflight crew attention was great, service on board 10 of 10. Finally the 380 is very confortable and nice to travel.

All crew except 1 were excellent. When I asked assistance with business class seat conversion to a bed (not being familiar as never used before but have numerous times with other airlines) crew member helped very reluctantly. I should have told her that business class seat conversion is totally different in each airline such as Delta, New Zealand Air and United. Sorry it was my 1st time with America Airlines. Now I know, I won't bother asking assistance in future.

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

Information on your arrival and departure airports

Washington Dulles Airport (IAD)