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Belfast Intl

$645+ Cheap flights from Dulles Intl (IAD) to Belfast Intl (BFS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/13. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BFS
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
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 septiembre 17, 2025.

Round-trip from

$645
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$647
From Washington, D.C. Dulles Intl to Belfast Intl
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Highest demand for flights based on searches. 20% potential increase in price ($194 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 17, 2025.

This Mytrip deal was found by Cheapflights users on 9/15. 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.
lun. 10/135:45 pmIAD - BFS
3 stops25h 00mMultiple Airlines
lun. 10/209:00 pmBFS - IAD
3 stops47h 20mMultiple Airlines
Deal found 9/15$645
This Mytrip deal was found by Cheapflights users on 9/16. 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.
mar. 10/286:30 pmIAD - BFS
3 stops23h 00mMultiple Airlines
mar. 11/47:05 amBFS - IAD
3 stops42h 55mMultiple Airlines
Deal found 9/16$673
This Mytrip deal was found by Cheapflights users on 9/16. 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.
vie. 10/3110:00 pmIAD - BFS
2 stops20h 00mMultiple Airlines
vie. 11/78:05 amBFS - IAD
2 stops16h 25mMultiple Airlines
Deal found 9/16$713
This Mytrip deal was found by Cheapflights users on 9/15. 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.
jue. 10/306:30 pmIAD - BFS
3 stops19h 05mMultiple Airlines
jue. 11/68:15 amBFS - IAD
3 stops41h 45mMultiple Airlines
Deal found 9/15$769
This Mytrip deal was found by Cheapflights users on 9/17. 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.
sáb. 11/16:30 pmIAD - BFS
3 stops22h 55mMultiple Airlines
sáb. 11/811:10 pmBFS - IAD
3 stops45h 05mMultiple Airlines
Deal found 9/17$852

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 septiembre 17, 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

lun. 10/13

5:45 pm-11:45 pm

3 stops25h 00m

Belfast Intl

lun. 10/20

9:00 pm-3:20 pm

3 stops47h 20m

$645

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

vie. 10/31

10:00 pm-10:00 pm

2 stops20h 00m

Belfast Intl

vie. 11/7

8:05 am-7:30 pm

2 stops16h 25m

$713

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

mar. 10/28

8:40 pm-9:50 pm

2 stops21h 10m

Belfast Intl

mar. 11/4

6:30 am-6:30 pm

2 stops17h 00m

$768

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

jue. 10/30

6:30 pm-5:35 pm

3 stops19h 05m

Belfast Intl

jue. 11/6

8:15 am-9:00 pm

3 stops41h 45m

$769

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

sáb. 11/1

6:30 pm-8:15 pm

2 stops21h 45m

Belfast Intl

sáb. 11/8

11:10 pm-3:15 pm

3 stops45h 05m

$869

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 septiembre 17, 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
7,367 reviews

Comfort

6.7

Boarding

6.9

Food

6.3

Crew

7.6

Entertainment

6.4

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.
British Airways
6.7
Okay
7,367 reviews
British Airways
6.7
Okay
7,367 reviews

Comfort

6.7

Boarding

6.9

Food

6.3

Crew

7.6

Entertainment

6.4

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.

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 $627.

  • 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.

See more FAQs

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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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Dulles Intl to Belfast City flights
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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 septiembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$627Average$861FlexibilityNo cancel feeOn-time70%

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