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$336+ 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 6/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
Apr 9 — Apr 161
Wed 4/9
Wed 4/16
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 April 4, 2025.

Round-trip from

$672
(Priceline)

One-way from

$336
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$658
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. 19% potential increase in price ($178 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 4, 2025.

This Priceline deal was found by Cheapflights users on 4/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:40 pmIAD - BHD
1 stop11h 55mBritish Airways
Sun 9/216:50 amBHD - IAD
1 stop15h 40mBritish Airways
Deal found 4/2$672
This Virgin Atlantic deal was found by Cheapflights users on 4/2. 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.
Tue 10/286:35 pmIAD - BHD
1 stop22h 25mVirgin Atlantic
Sun 11/25:30 amBHD - IAD
1 stop14h 15mVirgin Atlantic
Deal found 4/2$687
This American Airlines deal was found by Cheapflights users on 4/3. 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.
Wed 7/305:39 pmIAD - BHD
2 stops13h 16mAmerican Airlines
Sat 8/169:35 amBHD - IAD
1 stop15h 40mAmerican Airlines
Deal found 4/3$743
This KLM deal was found by Cheapflights users on 4/2. 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.
Wed 9/38:30 pmIAD - BHD
2 stops15h 25mKLM
Sun 9/215:25 pmBHD - IAD
1 stop27h 10mKLM
Deal found 4/2$777
This Cheapflightsfares deal was found by Cheapflights users on 4/2. 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.
Wed 9/35:20 pmIAD - BHD
2 stops14h 45mAer Lingus
Sun 9/216:50 amBHD - IAD
2 stops17h 05mAer Lingus
Deal found 4/2$893
This Delta deal was found by Cheapflights users on 4/4. 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.
Fri 6/138:30 pmIAD - BHD
2 stops19h 45mDelta
Fri 7/46:30 amBHD - IAD
1 stop14h 05mDelta
Deal found 4/4$924
This Mytrip deal was found by Cheapflights users on 4/2. 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 4/1010:35 amIAD - BHD
3 stops28h 20mMultiple Airlines
Tue 4/223:15 pmBHD - IAD
3 stops28h 58mMultiple Airlines
Deal found 4/2$1,210
This Trip.com deal was found by Cheapflights users on 4/2. 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.
Thu 4/101:30 pmIAD - BFS
2 stops27h 10mMultiple Airlines
Tue 4/227:05 amBFS - IAD
2 stops33h 40mMultiple Airlines
Deal found 4/2$1,569

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 April 4, 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

Wed 9/3

10:40 pm-3:35 pm

1 stop11h 55m

Belfast City

Sun 9/21

6:50 am-5:30 pm

1 stop15h 40m

$672

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 7/30

5:39 pm-11:55 am

2 stops13h 16m

Belfast City

Sat 8/16

9:35 am-8:15 pm

1 stop15h 40m

$743

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 9/3

8:30 pm-4:55 pm

2 stops15h 25m

Belfast City

Sun 9/21

5:25 pm-3:35 pm

1 stop27h 10m

$777

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 9/3

5:20 pm-1:05 pm

2 stops14h 45m

Belfast City

Sun 9/21

6:50 am-6:55 pm

2 stops17h 05m

$893

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 6/13

8:30 pm-9:15 pm

2 stops19h 45m

Belfast City

Fri 7/4

6:30 am-3:35 pm

1 stop14h 05m

$924

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 6/3

5:40 pm-9:00 am

1 stop10h 20m

Belfast City

Wed 6/11

6:50 am-3:50 pm

1 stop14h 00m

$5,371

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 6/23

11:35 am-6:45 pm

3 stops26h 10m

$336

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 6/23

11:35 am-9:00 am

3 stops40h 25m

$365

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 6/24

5:40 pm-9:00 am

1 stop10h 20m

$571

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/3

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

Rainfall in Belfast by month

Plan your trip to Belfast by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Belfast ranges from 2.0 - 3.5 inches per month. October is typically the wettest month, when rainfall can reach 3.5 in. April is typically the driest time to visit Belfast when rainfall is around 2.0 in.

Temperature in Belfast by month

Plan your trip to Belfast by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

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 April 4, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and American Airlines from Washington, D.C. to Belfast 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.
Delta
8.0
Very good
7,897 reviews

Crew

8.5

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Crew

8.5

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,897 reviews

Crew

8.5

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,897 reviews

Crew

8.5

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Aer Lingus
7.0
Good
1,059 reviews
Delta
8.0
Very good
7,897 reviews

Crew

8.5

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
British Airways
6.6
Okay
6,718 reviews
Delta
8.0
Very good
7,897 reviews

Crew

8.5

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • What are the cheapest airlines flying 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 $672. Additional round-trip tickets that might be worth considering are offered by American Airlines and KLM, with the lowest prices starting at $743 and $777, respectively.

  • 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

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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 April 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$578Average$924FlexibilityNo cancel feeOn-time70%

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