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$361+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
may. 4 — may. 111
dom. 5/4
dom. 5/11
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 abril 29, 2025.

Round-trip from

$666
(American Airlines)

One-way from

$361
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$935
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. 12% potential increase in price ($124 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($43 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 abril 29, 2025.

This American Airlines deal was found by Cheapflights users on 4/29. 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.
sáb. 9/67:25 pmIAD - BHD
1 stop11h 50mAmerican Airlines
sáb. 12/209:10 amBHD - IAD
1 stop11h 25mAmerican Airlines
Deal found 4/29$666
This British Airways deal was found by Cheapflights users on 4/29. 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.
jue. 5/17:25 pmIAD - BHD
1 stop12h 50mBritish Airways
dom. 5/41:00 pmBHD - IAD
1 stop12h 10mBritish Airways
Deal found 4/29$668
This KLM deal was found by Cheapflights users on 4/28. 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. 10/276:35 pmIAD - BHD
1 stop18h 15mKLM
dom. 11/25:30 amBHD - IAD
1 stop14h 15mKLM
Deal found 4/28$703
This Mytrip deal was found by Cheapflights users on 4/28. 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. 6/103:30 pmIAD - BFS
2 stops20h 10mMultiple Airlines
mar. 6/175:55 amBFS - IAD
3 stops20h 09mMultiple Airlines
Deal found 4/28$798
This Trip.com deal was found by Cheapflights users on 4/28. 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.
mar. 9/168:30 pmIAD - BHD
2 stops19h 15mMultiple Airlines
sáb. 9/207:00 pmBHD - IAD
2 stops32h 10mMultiple Airlines
Deal found 4/28$825
This Delta deal was found by Cheapflights users on 4/28. 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.
sáb. 11/225:10 pmIAD - BHD
2 stops22h 50mDelta
jue. 12/256:30 amBHD - IAD
1 stop14h 15mDelta
Deal found 4/28$833
This oojo deal was found by Cheapflights users on 4/28. 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.
jue. 5/15:20 pmIAD - BHD
2 stops16h 15mAer Lingus
dom. 5/47:00 amBHD - IAD
2 stops16h 55mAer Lingus
Deal found 4/28$837

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 abril 29, 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

sáb. 9/6

7:25 pm-12:15 pm

1 stop11h 50m

Belfast City

sáb. 12/20

9:10 am-3:35 pm

1 stop11h 25m

$666

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

sáb. 9/6

8:19 pm-5:15 pm

2 stops15h 56m

Belfast City

sáb. 12/20

6:00 pm-3:58 pm

2 stops26h 58m

$681

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

mar. 6/10

3:30 pm-4:40 pm

2 stops20h 10m

Belfast Intl

mar. 6/17

5:55 am-9:04 pm

3 stops20h 09m

$798

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

mar. 9/16

8:30 pm-8:45 pm

2 stops19h 15m

Belfast City

sáb. 9/20

7:00 pm-10:10 pm

2 stops32h 10m

$825

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

dom. 6/8

8:25 pm-2:35 pm

2 stops13h 10m

Belfast City

dom. 6/15

7:00 am-6:55 pm

2 stops16h 55m

$1,001

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

mié. 5/28

5:24 pm-4:55 pm

2 stops18h 31m

Belfast City

mié. 6/4

6:30 am-4:44 pm

2 stops15h 14m

$1,093

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

jue. 6/19

5:25 pm-4:55 pm

1 stop18h 30m

Belfast City

mar. 6/24

8:30 am-3:35 pm

1 stop12h 05m

$1,212

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

sáb. 8/9

10:35 pm-9:05 am

2 stops29h 30m

$361

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

sáb. 8/9

5:00 pm-7:45 am

2 stops33h 45m

$379

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

sáb. 8/9

5:55 pm-10:10 am

1 stop11h 15m

$398

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 11 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

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.

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 abril 29, 2025.
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

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
7,929 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

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
1,334 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

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
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

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
1,076 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

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
6,835 reviews
Delta
8.0
Very good
7,929 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

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 American Airlines is currently your cheapest option to Belfast, with prices starting at $666. Additional round-trip tickets that might be worth considering are offered by British Airways and Aer Lingus, with the lowest prices starting at $681 and $1,001, respectively. American Airlines is priced at 23% lower than the current average price of a flight leaving 3 months from now.

  • 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 abril 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$578Average$864FlexibilityNo cancel feeOn-time70%

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