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$289+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
ago. 26 — sep. 21
mar. 8/26
mar. 9/2
1 adult, Economy
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Cheap 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 agosto 21, 2025.

Round-trip from

$626
(Cheapflightsfares)

One-way from

$289
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$618
From Washington, D.C. Dulles Intl to Belfast
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One-way flight from Washington, D.C. Dulles Intl to Belfast
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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

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 agosto 21, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 8/21. 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.
mié. 10/87:25 pmIAD - BHD
1 stop13h 05mBritish Airways
lun. 10/131:50 pmBHD - IAD
1 stop11h 25mBritish Airways
Deal found 8/21$626
This British Airways deal was found by Cheapflights users on 8/18. 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.
mié. 11/126:20 pmIAD - BHD
1 stop9h 50mBritish Airways
dom. 11/169:10 amBHD - IAD
1 stop15h 45mBritish Airways
Deal found 8/18$632
This American Airlines deal was found by Cheapflights users on 8/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/1910:40 pmIAD - BHD
1 stop17h 05mAmerican Airlines
vie. 9/266:35 amBHD - IAD
1 stop18h 35mAmerican Airlines
Deal found 8/20$639
This Mytrip deal was found by Cheapflights users on 8/20. 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. 9/155:45 pmIAD - BFS
3 stops24h 10mMultiple Airlines
jue. 9/259:25 amBFS - IAD
3 stops34h 55mMultiple Airlines
Deal found 8/20$666
This Mytrip deal was found by Cheapflights users on 8/21. 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. 9/265:00 pmIAD - BFS
3 stops24h 35mMultiple Airlines
lun. 9/299:55 pmBFS - IAD
3 stops46h 25mMultiple Airlines
Deal found 8/21$700
This Air France deal was found by Cheapflights users on 8/21. 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.
sáb. 9/65:25 pmIAD - BHD
1 stop18h 30mMultiple Airlines
sáb. 12/205:20 pmBHD - IAD
1 stop27h 45mMultiple Airlines
Deal found 8/21$707
This KLM deal was found by Cheapflights users on 8/21. 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.
dom. 9/147:22 pmIAD - BHD
2 stops16h 33mKLM
dom. 9/216:30 amBHD - IAD
1 stop14h 05mKLM
Deal found 8/21$711
This Virgin Atlantic deal was found by Cheapflights users on 8/20. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/125:00 pmIAD - BHD
2 stops18h 50mVirgin Atlantic
dom. 11/166:30 amBHD - IAD
1 stop14h 35mVirgin Atlantic
Deal found 8/20$712
This Ovago deal was found by Cheapflights users on 8/19. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/2610:40 pmIAD - BHD
1 stop14h 35mBritish Airways
lun. 9/297:30 pmBHD - IAD
1 stop29h 40mBritish Airways
Deal found 8/19$713
This KLM deal was found by Cheapflights users on 8/21. 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.
lun. 8/255:25 pmIAD - BHD
1 stop22h 50mKLM
lun. 9/86:30 amBHD - IAD
2 stops17h 19mKLM
Deal found 8/21$717
This Delta deal was found by Cheapflights users on 8/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/268:17 pmIAD - BHD
2 stops19h 58mDelta
lun. 9/296:30 amBHD - IAD
2 stops18h 07mDelta
Deal found 8/21$721
This Gurufare deal was found by Cheapflights users on 8/18. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/1910:40 pmIAD - BHD
1 stop14h 35mBritish Airways
dom. 9/218:05 pmBHD - IAD
1 stop24h 55mBritish Airways
Deal found 8/18$748

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 agosto 21, 2025.
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

mié. 10/8

7:25 pm-1:30 pm

1 stop13h 05m

Belfast City

lun. 10/13

1:50 pm-8:15 pm

1 stop11h 25m

$626

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

sáb. 11/1

7:20 pm-11:10 am

1 stop11h 50m

Belfast City

dom. 11/9

6:30 am-3:35 pm

1 stop14h 05m

$626

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

mié. 11/12

6:20 pm-9:10 am

1 stop9h 50m

Belfast City

dom. 11/16

9:10 am-7:55 pm

1 stop15h 45m

$632

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

vie. 9/19

10:40 pm-8:45 pm

1 stop17h 05m

Belfast City

vie. 9/26

6:35 am-8:10 pm

1 stop18h 35m

$639

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

lun. 9/15

5:45 pm-10:55 pm

3 stops24h 10m

Belfast Intl

jue. 9/25

9:25 am-3:20 pm

3 stops34h 55m

$666

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

vie. 9/26

5:00 pm-10:35 pm

3 stops24h 35m

Belfast Intl

lun. 9/29

9:55 pm-3:20 pm

3 stops46h 25m

$700

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

dom. 9/14

5:25 pm-4:55 pm

1 stop18h 30m

Belfast City

dom. 9/21

5:25 pm-3:35 pm

1 stop27h 10m

$707

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

sáb. 9/6

5:25 pm-4:55 pm

1 stop18h 30m

Belfast City

sáb. 12/20

5:20 pm-4:05 pm

1 stop27h 45m

$707

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

vie. 9/26

5:25 pm-4:55 pm

1 stop18h 30m

Belfast City

lun. 9/29

6:30 am-3:35 pm

1 stop14h 05m

$707

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

vie. 9/26

8:17 pm-4:55 pm

2 stops15h 38m

Belfast City

lun. 9/29

5:25 pm-3:35 pm

1 stop27h 10m

$711

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 13 results
1
2

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 agosto 21, 2025.
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
7,291 reviews

Food

6.3

Entertainment

6.4

Overall

6.7

Boarding

6.9

Comfort

6.7

Crew

7.6

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
7,291 reviews
British Airways
6.7
Okay
7,291 reviews

Food

6.3

Entertainment

6.4

Overall

6.7

Boarding

6.9

Comfort

6.7

Crew

7.6

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. 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 $626, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 13h 05m. There are 3390 mi between Washington, D.C. Dulles Intl Airport and Belfast.

  • 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 $620.

  • 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.

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

    Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Belfast (average of $657). Flying from Washington, D.C. Dulles Intl Airport to Belfast 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

Browse thousands of different options on Cheapflights for your next trip

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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 agosto 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$620Average$847FlexibilityNo cancel feeOn-time70%

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