$366 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 9/5. 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

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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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, Oct 1 - Mon, Oct 6
British Airways Logo
10:45 pm - 3:35 pmIAD-BHD
11h 50m1 stop
British Airways Logo
12:15 pm - 8:15 pmBHD-IAD
13h 00m1 stop
$624British Airways
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Sat, Oct 4 - Fri, Oct 10
British Airways Logo
10:50 pm - 3:05 pmIAD-BHD
11h 15m1 stop
British Airways Logo
8:05 pm - 8:20 pmBHD-IAD
29h 15m1 stop
$626British Airways
Find Deal
Wed, Nov 12 - Sun, Nov 16
British Airways Logo
6:20 pm - 9:10 amIAD-BHD
9h 50m1 stop
British Airways Logo
6:30 am - 7:55 pmBHD-IAD
18h 25m1 stop
$630British Airways
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Wed, Nov 12 - Sun, Nov 16
British Airways Logo
6:20 pm - 10:15 amIAD-BHD
10h 55m1 stop
British Airways Logo
9:10 am - 7:55 pmBHD-IAD
15h 45m1 stop
$631British Airways
Find Deal
Wed, Oct 1 - Mon, Oct 6
British Airways Logo
10:45 pm - 3:35 pmIAD-BHD
11h 50m1 stop
British Airways Logo
6:30 pm - 3:00 pmBHD-IAD
25h 30m2 stops
$637British Airways
Find Deal
Wed, Oct 1 - Mon, Oct 6
Logo
5:50 pm - 10:00 pmIAD-BFS
23h 10m2 stops
Logo
6:45 am - 8:50 pmBFS-IAD
43h 05m3 stops
$646
Find Deal
Wed, Oct 1 - Mon, Oct 6
Logo
10:20 pm - 10:00 pmIAD-BFS
18h 40m3 stops
Logo
6:45 am - 8:50 pmBFS-IAD
43h 05m3 stops
$659
Find Deal
Tue, Oct 14 - Fri, Oct 24
Virgin Atlantic Logo
7:10 pm - 9:15 pmIAD-BHD
21h 05m2 stops
Virgin Atlantic Logo
6:30 am - 7:18 pmBHD-IAD
17h 48m2 stops
$830Virgin Atlantic
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Mon, Sep 1 - Mon, Sep 15
American Airlines Logo
8:19 pm - 5:30 pmIAD-BHD
16h 11m2 stops
American Airlines Logo
6:40 am - 6:51 pmBHD-IAD
17h 11m2 stops
$835American Airlines
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Sat, Sep 6 - Sat, Dec 20
Delta Logo
2:15 pm - 4:55 pmIAD-BHD
21h 40m2 stops
Delta Logo
6:30 am - 4:05 pmBHD-IAD
14h 35m1 stop
$925Delta
Find Deal
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 ($624) and Virgin Atlantic ($830).

Find deals

Good to know

Cheapest flight$366
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 $366 for a one-way ticket and $624 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, and SkyTeam are the airline alliances operating flights between Washington Dulles Airport and Belfast, with SkyTeam being the most commonly used for this route.

  • 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.
6.6
British AirwaysOverall score based on 7267 reviews
6.4Entertainment
6.9Boarding
7.6Crew
6.7Comfort
6.3Food
Airline reviews

Although the crew were great and the good nice, I might as well have been on Ryanair for the amount of space I had. Not good enough BA. I’d rather pay more and not feel like a human sardine.

2.0 MediocreDavid, Aug 2025JFK - LHR
Read more British Airways reviews

Although the crew were great and the good nice, I might as well have been on Ryanair for the amount of space I had. Not good enough BA. I’d rather pay more and not feel like a human sardine.

Love the A380 - loads of room. Headphone socket on my seat didn’t work. Sounds like a trivial issue? Well when flying long-haul the in-flight entertainment is what keeps you going so when it doesn’t work it’s a disaster. Pay attention to the details please BA. Spoiled what was otherwise an excellent flight with the usual brilliant crew.

Crew were fantastic can’t fault them at all. Couldn’t do enough for us

Crying baby the ENTIRE flight. Not your fault, but I paid 2700 for a premium economy ticket and it wasn't worth it. should have just stuck with coach. flight attendants very mediocre - minimal effort. Plane didn't seem very clean. Didn't have any cleansing wipes - most airlines give you this when you board. Flat screen scrolling didn't work. Toiletry case a joke - why bother at all?

The overall seat and cushion needs to be updated. It was hard and no support. My butt was numb for most of the flight. The food was subpar at best being in premium economy cost. The flight attendants were excellent and attentive during the whole flight. Disappointed I had to select our seats 24 hours prior.

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.

Very good crew. The seating in economy plus was excellent, and I slept most of the way. The diabetic meal that I requested was almost tasteless--about a 2 on a ten-point scale.--so I ate little. And why bother serving dinner to fliers at midnight?! I had eaten a meal at the airport six hours earlier. A good breakfast would be better.

Flight was delayed. Though I checked in with BA live chat three times, our special meals were not provided.

My experience with British Airways is excellent, thanks for all 🫶🏻✈️

Old tired plane, Uncomfortable business class seat. Breakfast dreadful and meagre. At least flight was on time!

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

Information on your arrival and departure airports

Washington Dulles Airport (IAD)

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