What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Belfast round-trip?

Our cheapest airline available from Washington, D.C. Dulles Intl Airport to Belfast is American Airlines. Our recent data shows that you can find tickets from as low as £498 on this airline. Additional options worth looking into are British Airways and Aer Lingus, starting at £510 and £749 round-trip. Users have found that American Airlines is 23% cheaper than the other options available to this destination.

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 £561. You can even find prices in January for less than £561, as users have found deals to Belfast from as low as £457. 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to Belfast as you normally would.

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 holiday 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.

£270+ Flights from Washington, D.C. Dulles Intl Airport to Belfast

Cheap flight deals from Dulles Intl to Belfast

Round-trip from	£498
One-way from	£270
Popular in	June
Cheapest in	October
Average price	£700

American Airlines
6/9-20/12
2 total stops
26h 05m total
Washington, D.C. to Belfast

Search Deals

9/8
2 total stops
29h 30m total
Washington, D.C. to Belfast

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£69 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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 29 April 2025.

Sat 6/919:25IAD - BHD

1 stop14h 40mAmerican Airlines

Sat 20/1209:10BHD - IAD

1 stop11h 25mAmerican Airlines

Deal found 28/4£498

Thu 1/517:40IAD - BHD

1 stop14h 35mBritish Airways

Sun 4/513:00BHD - IAD

1 stop12h 10mBritish Airways

Deal found 28/4£500

Mon 27/1018:35IAD - BHD

1 stop18h 15mKLM

Sun 2/1105:30BHD - IAD

1 stop14h 15mKLM

Deal found 28/4£526

Tue 10/615:30IAD - BFS

2 stops20h 10mMultiple Airlines

Tue 17/605:55BFS - IAD

3 stops20h 09mMultiple Airlines

Deal found 28/4£597

Tue 16/920:30IAD - BHD

2 stops19h 15mMultiple Airlines

Sat 20/919:00BHD - IAD

2 stops32h 10mMultiple Airlines

Deal found 28/4£617

Thu 1/517:20IAD - BHD

2 stops16h 15mAer Lingus

Sun 4/507:00BHD - IAD

2 stops16h 55mAer Lingus

Deal found 28/4£626

Wed 28/517:24IAD - BHD

2 stops18h 31mDelta

Wed 4/606:30BHD - IAD

2 stops15h 14mDelta

Deal found 28/4£818

Sun 13/717:25IAD - BHD

1 stop18h 30mVirgin Atlantic

Sat 19/706:30BHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 27/4£925

Best flights from Dulles Intl to Belfast
Discover carefully curated flight deals from Dulles Intl to Belfast that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 29 April 2025.

Sat 6/919:25IAD - BHD

1 stop14h 40mAmerican Airlines

Sat 20/1209:10BHD - IAD

1 stop11h 25mAmerican Airlines

Deal found 28/4£498

Sat 6/914:09IAD - BHD

2 stops19h 56mBritish Airways

Sat 20/1218:00BHD - IAD

2 stops26h 58mBritish Airways

Deal found 28/4£510

Tue 10/615:30IAD - BFS

2 stops20h 10mMultiple Airlines

Tue 17/605:55BFS - IAD

3 stops20h 09mMultiple Airlines

Deal found 28/4£597

Tue 10/621:00IAD - BHD

2 stops12h 35mAer Lingus

Tue 17/607:00BHD - IAD

2 stops17h 30mAer Lingus

Deal found 28/4£749

Wed 28/517:24IAD - BHD

2 stops18h 31mDelta

Wed 4/606:30BHD - IAD

2 stops15h 14mDelta

Deal found 28/4£818

Sun 13/717:25IAD - BHD

1 stop18h 30mVirgin Atlantic

Sat 19/706:30BHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 27/4£925

Fri 13/617:25IAD - BHD

1 stop18h 30mKLM

Fri 4/706:30BHD - IAD

1 stop14h 05mKLM

Deal found 28/4£1,057

Tue 16/920:30IAD - BHD

2 stops19h 15mMultiple Airlines

Sat 20/919:00BHD - IAD

2 stops32h 10mMultiple Airlines

Deal found 28/4£617

Last-minute flights from Dulles Intl to Belfast
Discover last-minute flight deals from Dulles Intl to Belfast. Data last updated 29 April 2025 and is based on user searches.

Thu 1/517:40IAD - BHD

1 stop12h 30mAmerican Airlines

Wed 14/506:50BHD - IAD

1 stop15h 35mAmerican Airlines

Deal found 28/4£498

Thu 1/517:40IAD - BHD

1 stop14h 35mBritish Airways

Sun 4/513:00BHD - IAD

1 stop12h 10mBritish Airways

Deal found 28/4£500

Thu 1/517:20IAD - BHD

2 stops16h 15mAer Lingus

Sun 4/507:00BHD - IAD

2 stops16h 55mAer Lingus

Deal found 28/4£626

Thu 1/520:45IAD - BFS

2 stops21h 30mMultiple Airlines

Wed 14/515:25BFS - IAD

2 stops29h 50mMultiple Airlines

Deal found 28/4£650

Thu 1/512:40IAD - BHD

3 stops20h 05mMultiple Airlines

Wed 14/518:45BHD - IAD

2 stops24h 34mMultiple Airlines

Deal found 28/4£1,100

Wed 28/517:24IAD - BHD

2 stops18h 31mDelta

Wed 4/606:30BHD - IAD

2 stops15h 14mDelta

Deal found 28/4£818

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 29 April 2025.

Sat 9/822:35IAD - BHD

2 stops29h 30mMultiple Airlines

Deal found 28/4£270

Sat 9/817:00IAD - BFS

2 stops33h 45mMultiple Airlines

Deal found 28/4£284

Sat 9/817:55IAD - BHD

1 stop11h 15mBritish Airways

Deal found 28/4£298

Sun 22/617:20IAD - BHD

2 stops15h 30mAer Lingus

Deal found 27/4£570

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

Sat 6/9

19:25-15:05

1 stop14h 40m

Belfast City

Sat 20/12

09:10-15:35

1 stop11h 25m

£498

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 6/9

14:09-15:05

2 stops19h 56m

Belfast City

Sat 20/12

18:00-15:58

2 stops26h 58m

£510

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Tue 10/6

15:30-16:40

2 stops20h 10m

Belfast Intl

Tue 17/6

05:55-21:04

3 stops20h 09m

£597

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 16/9

20:30-20:45

2 stops19h 15m

Belfast City

Sat 20/9

19:00-22:10

2 stops32h 10m

£617

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 10/6

21:00-14:35

2 stops12h 35m

Belfast City

Tue 17/6

07:00-19:30

2 stops17h 30m

£749

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 28/5

17:24-16:55

2 stops18h 31m

Belfast City

Wed 4/6

06:30-16:44

2 stops15h 14m

£818

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 13/7

17:25-16:55

1 stop18h 30m

Belfast City

Sat 19/7

06:30-15:35

1 stop14h 05m

£925

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 13/6

17:25-16:55

1 stop18h 30m

Belfast City

Fri 4/7

06:30-15:35

1 stop14h 05m

£1,057

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 9/8

22:35-09:05

2 stops29h 30m

£270

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 9/8

17:00-07:45

2 stops33h 45m

£284

Flights are sorted by cheapest return flights first.

Deals found on 28/4

Showing 1-10 of 12 results

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 return 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Belfast (average of £67). Flying from Washington, D.C. Dulles Intl Airport to Belfast in July is currently the most expensive (average of £90). 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

In terms of precipitation, rainfall in Belfast ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast when rainfall is around 50.0 mm.

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 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Belfast

Delta

8.0

Very Good

7,929 reviews

Check prices

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

Check prices

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

7,929 reviews

Check prices

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

7,929 reviews

Check prices

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

Check prices

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

Check prices

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?
Our cheapest airline available from Washington, D.C. Dulles Intl Airport to Belfast is American Airlines. Our recent data shows that you can find tickets from as low as £498 on this airline. Additional options worth looking into are British Airways and Aer Lingus, starting at £510 and £749 round-trip. Users have found that American Airlines is 23% cheaper than the other options available to this destination.
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 holiday 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Belfast (average of £67). Flying from Washington, D.C. Dulles Intl Airport to Belfast in July is currently the most expensive (average of £90). 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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Belfast Intl Airport car hire

Londonderry Eglinton Airport car hire

Isle of Islay Glenegedale Airport car hire

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How does Cheapflights help users find flights from Dulles Intl to Belfast?

Deals for Dulles Intl to Belfast flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Belfast?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Dulles Intl to Belfast.

Can Cheapflights find flights from Dulles Intl to Belfast with no change fees?

Need flexible booking options for your flight to Belfast from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Dulles Intl to Belfast become cheaper?

Not ready to book yet? You can track prices for flights from Dulles Intl to Belfast on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £270

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Dulles Intl to Belfast

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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 29 April 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 29 April 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

What is the cheapest month to book a 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

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.

Complete your trip

Complete your trip to Belfast by adding a car hire and/or hotel booking to your travel itinerary.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Dulles Intl to Belfast?

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Belfast?

Can Cheapflights find flights from Dulles Intl to Belfast with no change fees?

Can Cheapflights notify me if prices for flights from Dulles Intl to Belfast become cheaper?

100% Free

Book with Flexibility

Travel Smart

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 29 April 2025.