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Belfast Intl

$366+ Cheap flights from Dulles Intl (IAD) to Belfast Intl (BFS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BFS
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Dulles Intl to Belfast Intl

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Belfast Intl (BFS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$646
(Mytrip)

One-way from

$366
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$618
From Washington, D.C. Dulles Intl to Belfast Intl
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One-way flight from Washington, D.C. Dulles Intl to Belfast Intl
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Highest demand for flights based on searches. 22% potential increase in price ($217 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($43 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Dulles Intl to Belfast Intl

Cheapest flights from Dulles Intl to Belfast Intl
Explore the most affordable flight options available from Dulles Intl to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Mytrip deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/15:50 pmIAD - BFS
2 stops23h 10mMultiple Airlines
Mon 10/66:45 amBFS - IAD
3 stops43h 05mMultiple Airlines
Deal found 8/13$646
This Trip.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/48:30 pmIAD - BFS
2 stops21h 55mMultiple Airlines
Fri 10/106:15 amBFS - IAD
2 stops42h 05mMultiple Airlines
Deal found 8/14$690
This Mytrip deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/285:45 pmIAD - BFS
3 stops23h 30mMultiple Airlines
Sun 10/57:15 amBFS - IAD
3 stops37h 05mMultiple Airlines
Deal found 8/14$706
This Trip.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/110:25 pmIAD - BFS
1 stop19h 35mMultiple Airlines
Mon 9/157:10 pmBFS - IAD
1 stop25h 20mMultiple Airlines
Deal found 8/13$730

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Belfast Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport that are best for you.

Fly from

Dulles Intl

Fly to

Belfast Intl

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 10/1

5:50 pm-10:00 pm

2 stops23h 10m

Belfast Intl

Mon 10/6

6:45 am-8:50 pm

3 stops43h 05m

$646

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 10/4

8:30 pm-11:25 pm

2 stops21h 55m

Belfast Intl

Fri 10/10

6:15 am-7:20 pm

2 stops42h 05m

$690

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 9/28

5:45 pm-10:15 pm

3 stops23h 30m

Belfast Intl

Sun 10/5

7:15 am-3:20 pm

3 stops37h 05m

$706

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 9/1

10:25 pm-11:00 pm

1 stop19h 35m

Belfast Intl

Mon 9/15

7:10 pm-3:30 pm

1 stop25h 20m

$730

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 9/5

11:15 pm-9:00 am

3 stops52h 45m

$366

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Best time to book a flight from Dulles Intl to Belfast Intl

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Belfast Intl

Get insights into the airlines that provide service to Belfast Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Belfast Intl. Reviews last updated August 14, 2025.
Peruse reviews from past customers who have flown with British Airways from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,266 reviews

Comfort

6.7

Entertainment

6.4

Crew

7.6

Food

6.3

Boarding

6.9

Overall

6.7

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

LAX - LHR

Entertainment system did not work. Seems like Wi-Fi should have been comped at hat point. Boarding at Marco Polo in Venice was terrible. Insisted on gate checking our bag but not others! Connection was confused and flight was very late.
British Airways
6.7
Okay
7,266 reviews
British Airways
6.7
Okay
7,266 reviews

Comfort

6.7

Entertainment

6.4

Crew

7.6

Food

6.3

Boarding

6.9

Overall

6.7

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

LAX - LHR

Entertainment system did not work. Seems like Wi-Fi should have been comped at hat point. Boarding at Marco Polo in Venice was terrible. Insisted on gate checking our bag but not others! Connection was confused and flight was very late.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Belfast Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport round-trip?

    Flying on British Airways is currently your cheapest option to Belfast Intl Airport, with prices starting at $634.

  • Can I find deals for flights from Dulles Intl to Belfast Intl that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Belfast Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Belfast Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Belfast Intl.

  • Can I find deals for business class flights from Dulles Intl to Belfast Intl?

    Yes. Cheapflights offers flight deals from Dulles Intl to Belfast Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport (average of $657). Flying from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport in June is currently the most expensive (average of $1,189). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Dulles Intl to Belfast Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Dulles Intl to Belfast Intl

Discover the top airline that operate flights from Dulles Intl to Belfast Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$634Average$830FlexibilityNo cancel feeOn-time70%

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