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 British Airways. Our recent data shows that you can find tickets from as low as £466 on this airline. Additional options worth looking into are American Airlines and Delta, starting at £469 and £526 round-trip. Users have found that British Airways is 21% cheaper than the other options available to this destination.

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.

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).

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 August. Prices to Belfast from Washington, D.C. Dulles Intl Airport average £560. You can even find prices in August for less than £560, as users have found deals to Belfast from as low as £435. 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 63%.

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.

£466+ Flights from Washington, D.C. Dulles Intl Airport to Belfast

Cheap flight deals from Dulles Intl to Belfast

Round-trip from	£466
Popular in	December
Cheapest in	October
Average price	£726

British Airways
26/8-8/9
4 total stops
37h 29m total
Washington, D.C. to Belfast

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (£45 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£17 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 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 15 July 2025.

Tue 26/816:36IAD - BHD

2 stops12h 59mBritish Airways

Mon 8/919:30BHD - IAD

2 stops24h 30mBritish Airways

Deal found 13/7£466

Thu 23/1022:45IAD - BHD

1 stop11h 45mAmerican Airlines

Sun 26/1012:10BHD - IAD

1 stop12h 35mAmerican Airlines

Deal found 13/7£469

Thu 9/1020:30IAD - BFS

2 stops21h 55mMultiple Airlines

Mon 13/1010:35BFS - IAD

2 stops37h 45mMultiple Airlines

Deal found 13/7£480

Fri 19/917:25IAD - BHD

1 stop18h 30mDelta

Tue 30/917:25BHD - IAD

1 stop27h 10mDelta

Deal found 13/7£526

Mon 22/920:17IAD - BHD

2 stops15h 38mKLM

Wed 1/1017:25BHD - IAD

1 stop27h 10mKLM

Deal found 13/7£530

Sat 13/923:15IAD - BHD

2 stops16h 10mMultiple Airlines

Sun 21/907:05BHD - IAD

2 stops20h 05mMultiple Airlines

Deal found 13/7£536

Fri 7/1117:05IAD - BHD

2 stops14h 45mAer Lingus

Fri 14/1106:45BHD - IAD

2 stops17h 45mAer Lingus

Deal found 14/7£683

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 15 July 2025.

Tue 26/816:36IAD - BHD

2 stops12h 59mBritish Airways

Mon 8/919:30BHD - IAD

2 stops24h 30mBritish Airways

Deal found 13/7£466

Thu 23/1022:45IAD - BHD

1 stop11h 45mAmerican Airlines

Sun 26/1012:10BHD - IAD

1 stop12h 35mAmerican Airlines

Deal found 13/7£469

Thu 9/1020:30IAD - BFS

2 stops21h 55mMultiple Airlines

Mon 13/1010:35BFS - IAD

2 stops37h 45mMultiple Airlines

Deal found 13/7£480

Fri 19/917:25IAD - BHD

1 stop22h 50mDelta

Sun 5/1017:25BHD - IAD

1 stop27h 10mDelta

Deal found 13/7£526

Mon 22/920:17IAD - BHD

2 stops15h 38mKLM

Wed 1/1017:25BHD - IAD

1 stop27h 10mKLM

Deal found 13/7£530

Fri 7/1117:05IAD - BHD

2 stops14h 45mAer Lingus

Fri 14/1106:45BHD - IAD

2 stops17h 45mAer Lingus

Deal found 14/7£683

Sat 13/923:15IAD - BHD

2 stops16h 10mMultiple Airlines

Sun 21/907:05BHD - IAD

2 stops20h 05mMultiple Airlines

Deal found 13/7£536

Last-minute flights from Dulles Intl to Belfast
Discover last-minute flight deals from Dulles Intl to Belfast. Data last updated 15 July 2025 and is based on user searches.

Wed 30/717:25IAD - BHD

1 stop18h 30mDelta

Sat 16/806:30BHD - IAD

2 stops18h 13mDelta

Deal found 14/7£619

Fri 8/822:40IAD - BHD

1 stop14h 35mAer Lingus

Fri 22/806:35BHD - IAD

1 stop14h 20mAer Lingus

Deal found 13/7£2,517

Fri 8/819:25IAD - BHD

2 stops15h 05mAmerican Airlines

Fri 22/806:35BHD - IAD

2 stops17h 20mAmerican Airlines

Deal found 13/7£2,626

Tue 26/816:36IAD - BHD

2 stops12h 59mBritish Airways

Mon 8/919:30BHD - IAD

2 stops24h 30mBritish Airways

Deal found 13/7£466

Tue 26/817:25IAD - BHD

1 stop18h 30mKLM

Mon 8/906:30BHD - IAD

1 stop14h 05mKLM

Deal found 13/7£526

Tue 26/817:25IAD - BHD

1 stop22h 40mVirgin Atlantic

Mon 8/917:25BHD - IAD

2 stops23h 37mVirgin Atlantic

Deal found 13/7£533

Tue 26/809:35IAD - BHD

3 stops30h 35mMultiple Airlines

Mon 8/907:05BHD - IAD

3 stops37h 01mMultiple Airlines

Deal found 13/7£699

Thu 28/823:15IAD - BFS

2 stops15h 30mMultiple Airlines

Thu 4/907:20BFS - IAD

2 stops19h 50mMultiple Airlines

Deal found 14/7£542

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

Tue 26/8

16:36-10:35

2 stops12h 59m

Belfast City

Mon 8/9

19:30-15:00

2 stops24h 30m

£466

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 23/10

22:45-15:30

1 stop11h 45m

Belfast City

Sun 26/10

12:10-20:45

1 stop12h 35m

£469

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 9/10

20:30-23:25

2 stops21h 55m

Belfast Intl

Mon 13/10

10:35-19:20

2 stops37h 45m

£480

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 19/9

17:25-21:15

1 stop22h 50m

Belfast City

Sun 5/10

17:25-15:35

1 stop27h 10m

£526

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 22/9

20:17-16:55

2 stops15h 38m

Belfast City

Wed 1/10

17:25-15:35

1 stop27h 10m

£530

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 13/9

23:15-20:25

2 stops16h 10m

Belfast City

Sun 21/9

07:05-22:10

2 stops20h 05m

£536

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 7/11

17:05-12:50

2 stops14h 45m

Belfast City

Fri 14/11

06:45-19:30

2 stops17h 45m

£683

Flights are sorted by cheapest return flights first.

Deals found on 13/7

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.

Reviews of airlines servicing Belfast

Check out reviews from past customers who have flown with Delta, KLM, andAmerican Airlines from Washington, D.C. Dulles Intl Airport 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

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,956 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,372 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Aer Lingus

7.1

Good

1,165 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

British Airways

6.6

Okay

7,134 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 British Airways. Our recent data shows that you can find tickets from as low as £466 on this airline. Additional options worth looking into are American Airlines and Delta, starting at £469 and £526 round-trip. Users have found that British Airways is 21% 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

Browse thousands of different options on Cheapflights for your next trip

Complete your trip

Belfast car hire

Belfast Intl Airport car hire

Londonderry Eglinton Airport car hire

Isle of Islay Glenegedale Airport car hire

Londonderry car hire

Fly with Cheapflights

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £466

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 26/8. 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

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 15 July 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 15 July 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?

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 15 July 2025.