IAD - BFS

$630 Find Cheap Flights from Washington Dulles Airport to Belfast Intl Airport

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Belfast Intl departing on 9/12. 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 Intl Airport

 
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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Flights Deals

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

 
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 Intl 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 Intl

Fri, Sep 12 - Fri, Sep 19
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11:15 pm - 8:05 pmIAD-BFS
15h 50m2 stops
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6:05 am - 10:10 pmBFS-IAD
21h 05m2 stops
$630
Find Deal
Sat, Sep 13 - Sat, Sep 20
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11:15 pm - 9:05 pmIAD-BFS
16h 50m2 stops
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7:30 am - 7:20 pmBFS-IAD
16h 50m2 stops
$795
Find Deal
Wed, Aug 27 - Wed, Sep 3
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11:15 pm - 10:15 pmIAD-BFS
18h 00m2 stops
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7:25 am - 3:20 pmBFS-IAD
36h 55m3 stops
$843
Find Deal
Wed, Aug 27 - Wed, Sep 3
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8:30 pm - 8:35 pmIAD-BFS
19h 05m2 stops
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6:10 am - 10:10 pmBFS-IAD
21h 00m2 stops
$845
Find Deal
Sat, Sep 13 - Sat, Sep 20
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10:20 am - 11:00 amIAD-BFS
19h 40m3 stops
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9:40 am - 9:25 pmBFS-IAD
16h 45m2 stops
$1,024
Find Deal
Wed, Aug 27 - Wed, Sep 3
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10:40 pm - 10:00 pmIAD-BFS
18h 20m1 stop
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5:20 pm - 3:20 pmBFS-IAD
27h 00m2 stops
$1,067
Find Deal
Useful Info

Good to know

Low seasonApril
Cheapest flight$630
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 19% increase in price.
Flight from Washington Dulles Airport to Belfast Intl Airport

When to book flights from Dulles Intl to Belfast Intl

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

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport was $630 for a round-trip ticket.

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

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

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

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

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

    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 Intl Airport.

  • 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 Intl Airport?

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

    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 Intl Airport with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and BFS can sometimes prove cheaper using this method.

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

    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 Intl Airport 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 Intl

 
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 Intl? 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 7217 reviews
6.7Comfort
6.9Boarding
7.6Crew
6.4Entertainment
6.3Food
Airline reviews

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

4.0 OkayAnonymous, Jul 2025DEN - LHR
Read more British Airways reviews

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!

The crew is very friendly and helpful. The food is good for airplane food. The flight is long and hard to sleep. The leg space is great. The plane arrived in plenty of time.

Enjoyable flight, helpful crew everything was organized to accommodate passengers.

Captain sick. Unable to get replacement so delayed me 30 hours, many others delayed 54 hours. TOTALLY DESTROYED ALL MY PLANS, including lost my rental car which would now cost over 5 times what I paid so stuck with buses n trains... lost hotel reservations.... HORRIBLE!!!

They’ve lost my bag and I have no way of really getting in touch with anyone and have received no updates.

Very crowded, no real explanation of food "chicken or pasta?" After dinner no drinks service. Plane was clean, but little help with finding soaces fir luggage to get into overhead bins. Many passengers putting 2 bags, hats, duty free in overhead bins so no space for roll ons

Flight was good but seat in 12D was not comfortable, better on the Airbus 321 from Tampa to Charlotte. No breakfast was served before landing in zLonfon only a coffee and orange juice.

I was transferred to an American Airlines flight. The boarding was late and unorganized. The seating was extremely tight and uncomfortable. Will not use AA again.

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

Information on your arrival and departure airports

Washington Dulles Airport (IAD)
Belfast Intl (BFS)

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