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 $868. Additional round-trip tickets that might be worth considering are offered by KLM and Delta, with the lowest prices starting at $876 and $880, respectively.

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.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Belfast?

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Belfast flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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

Departing on a Monday is a good option for securing a great price. You can expect to save up to 11% when planning your travel around this day of the week.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Belfast?

The best pricing can be found in the month of January. Prices to Belfast from Washington, D.C. Dulles Intl Airport average $749. You can even find prices in January for less than $749, as users have found deals to Belfast from as low as $611. The month of June appears to be one of the more expensive times to travel to Belfast from Washington, D.C. Dulles Intl Airport. Flying in the targeted month can save you up to 48%.

What is the cheapest time of day to fly from IAD to BFS?

One of the essential ways to save on airfare from Washington, D.C. Dulles Intl Airport to Belfast is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 4% on airfare.

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.

$400+ Flights from Washington, D.C. Dulles Intl Airport to Belfast

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Cheap flight deals from Dulles Intl to Belfast

Round-trip from	$868 (Justfly.com)
One-way from	$400 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$663

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 ($183 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 25, 2025.

Sun 4/275:40 pmIAD - BHD

1 stop14h 25mAmerican Airlines

Sat 5/107:05 amBHD - IAD

1 stop18h 05mAmerican Airlines

Deal found 4/25

$666

Sat 9/67:25 pmIAD - BHD

1 stop11h 50mBritish Airways

Sat 12/206:00 pmBHD - IAD

1 stop30h 45mBritish Airways

Deal found 4/24

$673

Thu 10/167:50 pmIAD - BHD

2 stops20h 25mDelta

Tue 10/216:30 amBHD - IAD

2 stops22h 04mDelta

Deal found 4/24

$719

Sun 4/278:33 pmIAD - BHD

2 stops15h 22mKLM

Sat 5/105:25 pmBHD - IAD

2 stops28h 19mKLM

Deal found 4/25

$842

Fri 6/611:35 amIAD - BFS

3 stops27h 30mMultiple Airlines

Fri 6/135:05 pmBFS - IAD

3 stops31h 00mMultiple Airlines

Deal found 4/24

$923

Sat 5/175:20 pmIAD - BHD

2 stops15h 00mAer Lingus

Fri 5/236:50 pmBHD - IAD

2 stops26h 00mAer Lingus

Deal found 4/23

$1,006

Sat 5/179:20 pmIAD - BHD

2 stops14h 35mMultiple Airlines

Sun 5/256:30 amBHD - IAD

2 stops15h 15mMultiple Airlines

Deal found 4/23

$1,171

Mon 7/145:25 pmIAD - BHD

1 stop22h 50mVirgin Atlantic

Fri 7/186:30 amBHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 4/25

$7,261

Best flights from Dulles Intl to Belfast
Discover carefully curated flight deals from Dulles Intl to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 25, 2025.

Sun 5/1810:40 pmIAD - BHD

1 stop14h 05mBritish Airways

Sun 5/251:00 pmBHD - IAD

1 stop12h 10mBritish Airways

Deal found 4/23

$868

Fri 5/165:25 pmIAD - BHD

1 stop22h 50mKLM

Fri 5/236:30 amBHD - IAD

1 stop14h 05mKLM

Deal found 4/23

$876

Fri 5/1612:25 pmIAD - BHD

2 stops27h 50mDelta

Fri 5/236:30 amBHD - IAD

1 stop14h 05mDelta

Deal found 4/23

$880

Sat 5/1710:45 pmIAD - BHD

1 stop13h 30mAmerican Airlines

Sat 5/249:35 amBHD - IAD

1 stop15h 35mAmerican Airlines

Deal found 4/23

$898

Fri 6/611:35 amIAD - BFS

3 stops27h 30mMultiple Airlines

Fri 6/135:05 pmBFS - IAD

3 stops31h 00mMultiple Airlines

Deal found 4/24

$923

Sat 5/175:20 pmIAD - BHD

2 stops15h 00mAer Lingus

Fri 5/236:50 pmBHD - IAD

2 stops26h 00mAer Lingus

Deal found 4/23

$1,006

Sat 5/179:20 pmIAD - BHD

2 stops14h 35mMultiple Airlines

Sun 5/256:30 amBHD - IAD

2 stops15h 15mMultiple Airlines

Deal found 4/23

$1,171

Mon 7/145:25 pmIAD - BHD

1 stop22h 50mVirgin Atlantic

Fri 7/186:30 amBHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 4/25

$7,261

Last-minute flights from Dulles Intl to Belfast
Discover last-minute flight deals from Dulles Intl to Belfast. Data last updated April 25, 2025 and is based on user searches.

Sun 4/275:40 pmIAD - BHD

1 stop14h 25mAmerican Airlines

Sat 5/107:05 amBHD - IAD

1 stop18h 05mAmerican Airlines

Deal found 4/25

$666

Sun 4/274:52 pmIAD - BHD

2 stops15h 13mBritish Airways

Sat 5/109:35 amBHD - IAD

1 stop15h 35mBritish Airways

Deal found 4/25

$684

Sun 4/278:33 pmIAD - BHD

2 stops15h 22mKLM

Sat 5/105:25 pmBHD - IAD

2 stops28h 19mKLM

Deal found 4/25

$842

Sun 4/2710:40 pmIAD - BFS

1 stop28h 00mMultiple Airlines

Sat 5/107:35 pmBFS - IAD

2 stops50h 01mMultiple Airlines

Deal found 4/25

$955

Sun 5/410:40 pmIAD - BHD

1 stop11h 00mAmerican Airlines

Wed 5/710:00 amBHD - IAD

1 stop12h 25mAmerican Airlines

Deal found 4/25

$999

Sun 5/45:25 pmIAD - BHD

1 stop22h 50mKLM

Wed 5/76:30 amBHD - IAD

2 stops15h 14mKLM

Deal found 4/25

$1,046

Sun 5/48:25 pmIAD - BHD

2 stops13h 15mAer Lingus

Wed 5/79:50 amBHD - IAD

2 stops14h 40mAer Lingus

Deal found 4/25

$1,090

Fri 5/1612:25 pmIAD - BHD

2 stops27h 50mDelta

Fri 5/236:30 amBHD - IAD

1 stop14h 05mDelta

Deal found 4/23

$880

Sat 5/175:20 pmIAD - BHD

2 stops15h 00mAer Lingus

Fri 5/236:50 pmBHD - IAD

2 stops26h 00mAer Lingus

Deal found 4/23

$1,006

Sat 5/179:20 pmIAD - BHD

2 stops14h 35mMultiple Airlines

Sun 5/256:30 amBHD - IAD

2 stops15h 15mMultiple Airlines

Deal found 4/23

$1,171

One-way flights from Dulles Intl to Belfast
Search for one-way flight options from Dulles Intl to Belfast. Find affordable one-way fares based on user searches. Data last updated April 25, 2025.

Sat 5/316:00 amIAD - BHD

3 stops30h 40mMultiple Airlines

Deal found 4/24

$400

Cheapflights Fare Finder

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

Fly to

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 8/21

5:55 pm-1:15 pm

1 stop14h 20m

Belfast City

Tue 8/26

6:35 am-8:10 pm

1 stop18h 35m

$666

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 9/6

7:25 pm-12:15 pm

1 stop11h 50m

Belfast City

Sat 12/20

6:00 pm-7:45 pm

1 stop30h 45m

$673

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 10/16

7:50 pm-9:15 pm

2 stops20h 25m

Belfast City

Tue 10/21

6:30 am-11:34 pm

2 stops22h 04m

$719

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 5/16

5:25 pm-9:15 pm

1 stop22h 50m

Belfast City

Fri 5/23

6:30 am-3:35 pm

1 stop14h 05m

$876

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 6/6

11:35 am-8:05 pm

3 stops27h 30m

Belfast Intl

Fri 6/13

5:05 pm-7:05 pm

3 stops31h 00m

$923

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 5/17

5:20 pm-1:20 pm

2 stops15h 00m

Belfast City

Fri 5/23

6:50 pm-3:50 pm

2 stops26h 00m

$1,006

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 5/17

9:20 pm-4:55 pm

2 stops14h 35m

Belfast City

Sun 5/25

6:30 am-4:45 pm

2 stops15h 15m

$1,171

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 7/14

5:25 pm-9:15 pm

1 stop22h 50m

Belfast City

Fri 7/18

6:30 am-3:35 pm

1 stop14h 05m

$7,261

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 5/31

6:00 am-5:40 pm

3 stops30h 40m

$400

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/24

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

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

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

Peruse reviews from past customers who have flown with Delta, KLM and Virgin Atlantic 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

7,920 reviews

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

7,920 reviews

Delta

8.0

Very good

7,920 reviews

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

1,333 reviews

Delta

8.0

Very good

7,920 reviews

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.

Virgin Atlantic

7.4

Good

642 reviews

Delta

8.0

Very good

7,920 reviews

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

7,920 reviews

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

1,070 reviews

Delta

8.0

Very good

7,920 reviews

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

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 $868. Additional round-trip tickets that might be worth considering are offered by KLM and Delta, with the lowest prices starting at $876 and $880, 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Dulles Intl to Belfast

Dulles Intl to Belfast Intl flights

Baltimore to Belfast Intl flights

Reagan-National to Belfast Intl flights

Dulles Intl to Belfast City flights

Baltimore to Belfast City flights

Reagan-National to Belfast City flights

Baltimore to Campbeltown flights

Top airline flying from Dulles Intl to Belfast

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest$578	Average$913	FlexibilityNo cancel fee	On-time70%

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$400+ 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 5/31. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Belfast with Cheapflights

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Cheap flight deals from Dulles Intl to Belfast

Round-trip from

One-way from

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Find flight deals from Dulles Intl to Belfast

Cheapest flights from Dulles Intl to BelfastExplore 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 25, 2025.

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 25, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Belfast that are best for you.

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.

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.

Temperature in Belfast by month

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

Reviews of airlines servicing Belfast

Peruse reviews from past customers who have flown with Delta, KLM and Virgin Atlantic 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.

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?

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Dulles Intl to Belfast

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Dulles Intl to Belfast

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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 25, 2025.