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$304+ Cheap flights from Dulles Intl (IAD) to Belfast

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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap flight deals from Dulles Intl to Belfast

Cheapest flights from Dulles Intl to Belfast
Explore the most affordable flight options available from Dulles Intl to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.

This oojo deal was found by Cheapflights users on 2/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/810:45 pm
IAD
-
BHD
1 stop11h 10m
British Airways
Sun 3/158:25 pm
BHD
-
IAD
1 stop28h 30m
British Airways
Deal found 2/7$646
This British Airways deal was found by Cheapflights users on 2/8. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:20 pm
IAD
-
BHD
1 stop9h 50m
British Airways
Sun 3/812:10 pm
BHD
-
IAD
1 stop32h 25m
British Airways
Deal found 2/8$649
This oojo deal was found by Cheapflights users on 2/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/59:45 pm
IAD
-
BHD
1 stop29h 40m
British Airways
Thu 3/126:35 am
BHD
-
IAD
1 stop14h 00m
British Airways
Deal found 2/9$655
This Cheapflightsfares deal was found by Cheapflights users on 2/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:30 pm
IAD
-
BHD
1 stop12h 50m
British Airways
Tue 9/11:45 pm
BHD
-
IAD
1 stop11h 35m
British Airways
Deal found 2/9$658
This Cheapflightsfares deal was found by Cheapflights users on 2/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:30 pm
IAD
-
BHD
1 stop12h 50m
British Airways
Mon 8/316:30 am
BHD
-
IAD
1 stop14h 20m
British Airways
Deal found 2/10$659
This oojo deal was found by Cheapflights users on 2/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:40 pm
IAD
-
BHD
1 stop11h 30m
British Airways
Thu 9/109:35 am
BHD
-
IAD
1 stop15h 45m
British Airways
Deal found 2/9$662
This Air France deal was found by Cheapflights users on 2/9. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/156:05 pm
IAD
-
BHD
1 stop17h 45m
Multiple Airlines
Mon 2/236:30 am
BHD
-
IAD
1 stop14h 35m
Multiple Airlines
Deal found 2/9$670
This oojo deal was found by Cheapflights users on 2/8. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/25:40 pm
IAD
-
BHD
1 stop21h 55m
British Airways
Tue 4/78:25 pm
BHD
-
IAD
1 stop26h 00m
British Airways
Deal found 2/8$673
This KLM deal was found by Cheapflights users on 2/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/155:13 pm
IAD
-
BHD
2 stops18h 37m
KLM
Mon 2/236:30 am
BHD
-
IAD
1 stop14h 35m
KLM
Deal found 2/9$674
This Air France deal was found by Cheapflights users on 2/9. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/56:05 pm
IAD
-
BHD
1 stop17h 45m
Multiple Airlines
Thu 3/126:30 am
BHD
-
IAD
2 stops16h 49m
Multiple Airlines
Deal found 2/9$680
This Mytrip deal was found by Cheapflights users on 2/8. 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.
Mon 3/96:30 pm
IAD
-
BFS
2 stops19h 25m
Multiple Airlines
Mon 3/168:35 am
BFS
-
IAD
3 stops35h 00m
Multiple Airlines
Deal found 2/8$706
This Mytrip deal was found by Cheapflights users on 2/9. 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.
Thu 8/208:30 pm
IAD
-
BFS
2 stops14h 20m
Multiple Airlines
Thu 9/102:50 pm
BFS
-
IAD
3 stops29h 15m
Multiple Airlines
Deal found 2/9$903

Find flight deals from Dulles Intl to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Belfast (BF1). 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 February 11, 2026.

Round-trip from

$646
(oojo)

One-way from

$304
(Kiwi.com)
From Washington, D.C. Dulles Intl to Belfast
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Belfast
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Belfast 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 February 11, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Belfast that are best for you.

Fly from

Dulles Intl

Fly to

Belfast

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 3/5

9:45 pm-8:25 am

1 stop29h 40m

Belfast City

Thu 3/12

9:05 am-8:55 pm

1 stop15h 50m

$656

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 5/9

5:40 pm-12:25 pm

1 stop13h 45m

Belfast City

Thu 5/21

6:30 am-3:50 pm

1 stop14h 20m

$658

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 3/4

6:05 pm-4:50 pm

1 stop17h 45m

Belfast City

Sun 3/8

6:30 am-4:05 pm

1 stop14h 35m

$670

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 3/4

12:24 pm-4:50 pm

2 stops23h 26m

Belfast City

Sun 3/8

6:30 am-4:05 pm

1 stop14h 35m

$674

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 3/5

6:05 pm-4:50 pm

1 stop17h 45m

Belfast City

Thu 3/12

6:30 am-8:46 pm

2 stops18h 16m

$680

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 3/9

6:30 pm-5:55 pm

2 stops19h 25m

Belfast Intl

Mon 3/16

8:35 am-3:35 pm

3 stops35h 00m

$706

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 3/8

1:19 pm-4:50 pm

2 stops23h 31m

Belfast City

Sun 3/15

6:30 am-5:05 pm

1 stop14h 35m

$739

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 5/10

5:40 pm-10:30 am

1 stop11h 50m

Belfast City

Wed 5/13

11:35 am-8:20 pm

1 stop13h 45m

$749

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 4/2

5:40 pm-8:35 pm

1 stop21h 55m

Belfast City

Tue 4/7

6:20 pm-5:25 pm

1 stop28h 05m

$752

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 5/21

5:15 pm-7:30 pm

2 stops21h 15m

Belfast Intl

Tue 5/26

10:30 pm-3:05 pm

3 stops45h 35m

$981

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 22 results
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Best time to book a flight from Dulles Intl to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast 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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Belfast
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. 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. Reviews last updated February 11, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Belfast, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,724 reviews

Crew

7.6

Boarding

6.9

Entertainment

6.4

Comfort

6.8

Food

6.4

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Lakshmi,Dec 2025

SFO - LHR

I had a great time on the flight with good entertainment and food. The staff was awesome. The only thing was there was a delay in boarding and takeoff from London. However, I was pleasantly surprised when the airline sent an apology for the few later landing in Mumbai. They did not have WiFi on board on the leg from London to Mumbai but that was okay for me. On the first leg from SF to London, a couple of seats ahead of me had issues with their display so they could not watch anything on their screens although the stewardess gas be them an option to use the WiFi on their devices. This did not affect me, however, so that was cool. I would recommend British Airways. This was my first time flying with them and I had a lovely flight.
British Airways
6.7
Okay
7,724 reviews
British Airways
6.7
Okay
7,724 reviews

Crew

7.6

Boarding

6.9

Entertainment

6.4

Comfort

6.8

Food

6.4

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Lakshmi,Dec 2025

SFO - LHR

I had a great time on the flight with good entertainment and food. The staff was awesome. The only thing was there was a delay in boarding and takeoff from London. However, I was pleasantly surprised when the airline sent an apology for the few later landing in Mumbai. They did not have WiFi on board on the leg from London to Mumbai but that was okay for me. On the first leg from SF to London, a couple of seats ahead of me had issues with their display so they could not watch anything on their screens although the stewardess gas be them an option to use the WiFi on their devices. This did not affect me, however, so that was cool. I would recommend British Airways. This was my first time flying with them and I had a lovely flight.

Related info for your journey

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

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

    For as low as $670, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 17h 45m. There are 3390 mi between Washington, D.C. Dulles Intl Airport and Belfast. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Flying on British Airways is currently your cheapest option to Belfast, with prices starting at $627.

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

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

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

    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.

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

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

See more FAQs

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Top airline flying from Dulles Intl to Belfast

Discover the top airline that operate flights from Dulles Intl to Belfast. 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 February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$627Average$875FlexibilityNo cancel feeOn-time70%

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