$322 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 1/28. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$614
Multiple Airlines
Mon 4/27Wed 5/6
IAD - BHD • 2 stops
Cheapest one-way
$322
Multiple Airlines
Wed 1/28
IAD - BFS • 2 stops
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 Belfast!
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

Mon, Apr 27 - Wed, May 6
Multiple Airlines Logo
8:30 pm - 8:30 pm
IAD
-
BHD
19h 00m2 stops
Multiple Airlines Logo
7:00 am - 10:30 pm
BHD
-
IAD
20h 30m2 stops
$614Multiple Airlines
Fri, Jan 23 - Fri, Jan 30
British Airways Logo
9:45 pm - 2:15 pm
IAD
-
BHD
11h 30m1 stop
British Airways Logo
8:45 am - 7:55 pm
BHD
-
IAD
16h 10m1 stop
$621British Airways
Thu, Mar 5 - Thu, Mar 12
British Airways Logo
6:20 pm - 10:20 am
IAD
-
BHD
11h 00m1 stop
British Airways Logo
6:35 am - 4:35 pm
BHD
-
IAD
14h 00m1 stop
$622British Airways
Mon, Apr 27 - Wed, May 6
British Airways Logo
10:25 pm - 3:40 pm
IAD
-
BHD
12h 15m1 stop
British Airways Logo
6:50 am - 3:50 pm
BHD
-
IAD
14h 00m1 stop
$638British Airways
Wed, Mar 4 - Sun, Mar 8
British Airways Logo
6:20 pm - 10:15 am
IAD
-
BHD
10h 55m1 stop
British Airways Logo
5:35 pm - 4:35 pm
BHD
-
IAD
27h 00m1 stop
$646British Airways
Wed, Mar 4 - Sun, Mar 8
British Airways Logo
9:45 pm - 4:35 pm
IAD
-
BHD
13h 50m1 stop
British Airways Logo
5:35 pm - 4:35 pm
BHD
-
IAD
27h 00m1 stop
$647British Airways
Wed, Jan 28 - Wed, Mar 18
American Airlines Logo
1:08 pm - 10:15 am
IAD
-
BHD
16h 07m2 stops
American Airlines Logo
11:25 am - 11:59 pm
BHD
-
IAD
16h 34m2 stops
$659American Airlines
Fri, Jan 23 - Fri, Jan 30
Delta Logo
12:23 pm - 4:50 pm
IAD
-
BHD
23h 27m2 stops
Delta Logo
5:20 pm - 4:05 pm
BHD
-
IAD
27h 45m1 stop
$672Delta
Thu, Mar 5 - Thu, Mar 12
Delta Logo
12:24 pm - 4:50 pm
IAD
-
BHD
23h 26m2 stops
Delta Logo
6:30 am - 5:05 pm
BHD
-
IAD
14h 35m1 stop
$673Delta
Fri, Jan 23 - Fri, Jan 30
Delta Logo
12:23 pm - 4:50 pm
IAD
-
BHD
23h 27m2 stops
Delta Logo
5:20 pm - 11:06 pm
BHD
-
IAD
34h 46m2 stops
$682Delta
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 fly non-stop between Washington, D.C. Dulles Intl Airport and Belfast?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Washington, D.C. Dulles Intl Airport to Belfast.

There is just one airline that flies from Washington, D.C. Dulles Intl Airport to Belfast direct and that is British Airways. The best round-trip deal found from British Airways for the route is $620.

Find deals

Good to know

Cheapest flight$322
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 $322 for a one-way ticket and $614 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 7618 reviews
7.6Crew
6.9Boarding
6.4Entertainment
6.4Food
6.7Comfort
Airline reviews

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

2.0 MediocreAnonymous, Dec 2025
BOS - LHR
Read more British Airways reviews

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.

The cramped seats are cruel and unusual punishment and may violate the Geneva code.

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

Smooth trip no turbulence which is always a bonus for me lol! In cattle class so an element of being a bit squished (but not as bad as other shorter haul airlines) smaller plane than the one we flew out on and entertainment system wasn’t as modern but still definitely passed the time. Lovely crew x

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Seat pitch is not enough to eat comfortably. When seat in front is reclined, your screen comes closer to your face. Ryanair seats are actually more comfortable.

The leg from Portland to Heathrow was great for a business class ticket. The BA leg from Heathrow to Lisbon was terrible. Basically coach seating with an empty seat between you and next passenger. Absolutely no leg room. Should not have been charged for business class and it was a 3 hour flight.

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

Information on your arrival and departure airports

Washington Dulles Airport (IAD)