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 £487 on this airline. Additional options worth looking into are American Airlines and Delta, starting at £511 and £592 round-trip.

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Belfast one-way?

For one-way options, check prices for British Airways. According to our data, you can fly for as low as £372. Users have also found prices from £512 and £519 on American Airlines and Aer Lingus, respectively.

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.

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 £582. You can even find prices in January for less than £582, as users have found deals to Belfast from as low as £473. 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 47%.

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.

£334+ Flights from Washington, D.C. Dulles Intl Airport to Belfast

Cheap flight deals from Dulles Intl to Belfast

Round-trip from	£487
One-way from	£334
Popular in	June
Cheapest in	January
Average price	£509

British Airways
28/4-5/5
4 total stops
45h 58m total
Washington, D.C. to Belfast

Search Deals

6/6
3 total stops
47h 20m total
Washington, D.C. to Belfast

Search Deals

Highest demand for flights based on searches. 19% potential increase in price (£106 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£20 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 2 April 2025.

Mon 28/414:12IAD - BHD

2 stops20h 28mBritish Airways

Mon 5/518:30BHD - IAD

2 stops25h 30mBritish Airways

Deal found 31/3£487

Tue 6/517:40IAD - BHD

1 stop10h 20mAmerican Airlines

Wed 14/513:50BHD - IAD

1 stop11h 15mAmerican Airlines

Deal found 31/3£511

Fri 4/417:25IAD - BHD

1 stop18h 30mKLM

Sun 6/417:25BHD - IAD

1 stop27h 10mKLM

Deal found 30/3£538

Tue 6/517:32IAD - BHD

2 stops22h 33mDelta

Wed 14/506:30BHD - IAD

2 stops20h 04mDelta

Deal found 31/3£592

Tue 5/817:20IAD - BHD

2 stops14h 30mAer Lingus

Mon 11/819:30BHD - IAD

2 stops25h 20mAer Lingus

Deal found 1/4£731

Fri 6/611:35IAD - BHD

3 stops21h 05mMultiple Airlines

Fri 20/615:20BHD - IAD

3 stops34h 44mMultiple Airlines

Deal found 31/3£802

Sun 13/417:25IAD - BHD

1 stop18h 30mVirgin Atlantic

Thu 17/406:30BHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 1/4£806

Thu 22/513:30IAD - BFS

2 stops21h 05mMultiple Airlines

Fri 30/508:25BFS - IAD

2 stops32h 20mMultiple Airlines

Deal found 1/4£940

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 2 April 2025.

Mon 28/414:12IAD - BHD

2 stops20h 28mBritish Airways

Mon 5/518:30BHD - IAD

2 stops25h 30mBritish Airways

Deal found 31/3£487

Tue 6/517:40IAD - BHD

1 stop10h 20mAmerican Airlines

Wed 14/513:50BHD - IAD

1 stop11h 15mAmerican Airlines

Deal found 31/3£511

Tue 6/517:32IAD - BHD

2 stops22h 33mDelta

Wed 14/506:30BHD - IAD

2 stops20h 04mDelta

Deal found 31/3£592

Tue 5/817:20IAD - BHD

2 stops14h 30mAer Lingus

Mon 11/819:30BHD - IAD

2 stops25h 20mAer Lingus

Deal found 1/4£731

Fri 6/611:35IAD - BHD

3 stops21h 05mMultiple Airlines

Fri 20/615:20BHD - IAD

3 stops34h 44mMultiple Airlines

Deal found 31/3£802

Sun 13/417:25IAD - BHD

1 stop18h 30mVirgin Atlantic

Thu 17/406:30BHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 1/4£806

Sun 13/417:25IAD - BHD

1 stop22h 50mKLM

Sat 19/417:25BHD - IAD

1 stop27h 10mKLM

Deal found 1/4£882

Thu 22/513:30IAD - BFS

2 stops21h 05mMultiple Airlines

Fri 30/508:25BFS - IAD

2 stops32h 20mMultiple Airlines

Deal found 1/4£940

Last-minute flights from Dulles Intl to Belfast
Discover last-minute flight deals from Dulles Intl to Belfast. Data last updated 2 April 2025 and is based on user searches.

Fri 4/417:25IAD - BHD

1 stop18h 30mKLM

Sun 6/417:25BHD - IAD

1 stop27h 10mKLM

Deal found 30/3£538

Fri 11/420:14IAD - BHD

2 stops35h 01mBritish Airways

Sat 19/409:35BHD - IAD

1 stop15h 40mBritish Airways

Deal found 31/3£1,008

Fri 11/417:25IAD - BHD

1 stop22h 50mKLM

Sat 19/406:30BHD - IAD

1 stop14h 05mKLM

Deal found 31/3£1,532

Sun 13/417:25IAD - BHD

1 stop18h 30mVirgin Atlantic

Thu 17/406:30BHD - IAD

1 stop14h 05mVirgin Atlantic

Deal found 1/4£806

Mon 28/414:12IAD - BHD

2 stops20h 28mBritish Airways

Mon 5/518:30BHD - IAD

2 stops25h 30mBritish Airways

Deal found 31/3£487

Tue 6/517:40IAD - BHD

1 stop10h 20mAmerican Airlines

Wed 14/513:50BHD - IAD

1 stop11h 15mAmerican Airlines

Deal found 31/3£511

Tue 6/517:32IAD - BHD

2 stops22h 33mDelta

Wed 14/506:30BHD - IAD

2 stops20h 04mDelta

Deal found 31/3£592

Tue 6/509:45IAD - BHD

3 stops29h 40mMultiple Airlines

Wed 14/507:05BHD - IAD

3 stops33h 42mMultiple Airlines

Deal found 31/3£821

Thu 22/513:30IAD - BFS

2 stops21h 05mMultiple Airlines

Fri 30/508:25BFS - IAD

2 stops32h 20mMultiple Airlines

Deal found 1/4£940

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 2 April 2025.

Fri 6/611:35IAD - BHD

3 stops47h 20mMultiple Airlines

Deal found 31/3£334

Fri 22/817:55IAD - BHD

1 stop9h 55mBritish Airways

Deal found 31/3£372

Fri 20/617:40IAD - BHD

1 stop10h 10mAmerican Airlines

Deal found 31/3£512

Fri 20/617:20IAD - BHD

2 stops16h 15mAer Lingus

Deal found 31/3£519

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

Mon 28/4

14:12-15:40

2 stops20h 28m

Belfast City

Mon 5/5

18:30-15:00

2 stops25h 30m

£487

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 6/5

17:40-09:00

1 stop10h 20m

Belfast City

Wed 14/5

13:50-20:05

1 stop11h 15m

£511

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 6/5

17:32-21:05

2 stops22h 33m

Belfast City

Wed 14/5

06:30-21:34

2 stops20h 04m

£592

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 5/8

17:20-12:50

2 stops14h 30m

Belfast City

Mon 11/8

19:30-15:50

2 stops25h 20m

£731

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 6/6

11:35-13:40

3 stops21h 05m

Belfast City

Fri 20/6

15:20-21:04

3 stops34h 44m

£802

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 13/4

17:25-16:55

1 stop18h 30m

Belfast City

Thu 17/4

06:30-15:35

1 stop14h 05m

£806

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 13/4

17:25-21:15

1 stop22h 50m

Belfast City

Sat 19/4

17:25-15:35

1 stop27h 10m

£882

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 22/5

13:30-15:35

2 stops21h 05m

Belfast Intl

Fri 30/5

08:25-11:45

2 stops32h 20m

£940

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 6/6

11:35-15:55

3 stops47h 20m

£334

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 22/8

17:55-08:50

1 stop9h 55m

£372

Flights are sorted by cheapest return flights first.

Deals found on 31/3

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

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

To help decide which airline to fly from Washington, D.C. to Belfast, see what other customers have to say about Delta, KLM and Virgin Atlantic. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,898 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

7,898 reviews

Delta

8.0

Very Good

7,898 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

1,323 reviews

Delta

8.0

Very Good

7,898 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

636 reviews

Delta

8.0

Very Good

7,898 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

7,898 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

1,060 reviews

Delta

8.0

Very Good

7,898 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 British Airways. Our recent data shows that you can find tickets from as low as £487 on this airline. Additional options worth looking into are American Airlines and Delta, starting at £511 and £592 round-trip.
What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Belfast one-way?
For one-way options, check prices for British Airways. According to our data, you can fly for as low as £372. Users have also found prices from £512 and £519 on American Airlines and Aer Lingus, 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 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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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 £334

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 6/6. 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 2 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 2 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

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?

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Belfast one-way?

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 2 April 2025.