How long is the flight from Washington, D.C. Dulles Intl Airport to Belfast?

For as low as £766, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 11h 40m. The distance from Washington, D.C. Dulles Intl Airport to Belfast is about 3390 mi. Both multi-stop and direct flights can be found to your destination and back.

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 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.

£217+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Belfast

Cheap flight deals from Dulles Intl to Belfast

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 18 August 2026.

Sun 25/1020:40 -

3 stops20h 40m

Sat 7/1113:10 -

3 stops34h 55m

Deal found 17/8£566

Thu 22/1020:30 -

2 stops17h 50m

Tue 27/1008:25 -

3 stops39h 40m

Deal found 17/8£580

Wed 30/909:55 -

2 stops28h 20m

Wed 7/1006:10 -

2 stops21h 05m

Deal found 16/8£586

Tue 29/916:00 -

2 stops22h 50m

Tue 6/1008:50 -

3 stops36h 15m

Deal found 15/8£590

Sun 27/923:20 -

2 stops16h 40m

Sun 4/1022:10 -

3 stops25h 50m

Deal found 13/8£610

Thu 22/1020:30 -

2 stops17h 10m

Tue 27/1007:20 -

2 stops16h 10m

Deal found 17/8£617

Wed 7/1016:00 -

2 stops22h 15m

Wed 21/1008:30 -

2 stops18h 45m

Deal found 18/8£654

Mon 28/920:30 -

2 stops19h 25m

Tue 6/1007:00 -

2 stops17h 35m

Deal found 17/8£672

Mon 21/909:55 -

2 stops21h 00m

Sun 18/1007:00 -

3 stops38h 38m

Deal found 13/8£708

Sun 25/1020:40 -

3 stops20h 15m

Sat 7/1107:25 -

2 stops17h 45m

Deal found 17/8£709

Fri 25/920:30 -

3 stops32h 20m

Sun 4/1007:00 -

3 stops37h 10m

Deal found 13/8£727

Mon 7/1221:45 -

1 stop11h 30m

Fri 11/1206:45 -

1 stop18h 10m

Deal found 17/8£729

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 18 August 2026.

Sun 25/1020:40 -

3 stops20h 40m

Sat 7/1113:10 -

3 stops34h 55m

Deal found 17/8£566

Wed 9/1221:55 -

1 stop11h 40m

Sun 13/1220:30 -

1 stop28h 25m

Deal found 15/8£766

Thu 19/1118:20 -

2 stops17h 30m

Wed 25/1109:45 -

2 stops18h 36m

Deal found 17/8£829

Fri 11/917:15 -

2 stops15h 55m

Wed 16/907:00 -

2 stops17h 25m

Deal found 13/8£848

Thu 19/1112:35 -

2 stops15h 35m

Thu 26/1109:40 -

2 stops16h 47m

Deal found 17/8£874

Thu 22/1020:30 -

2 stops17h 50m

Tue 27/1008:25 -

3 stops39h 40m

Deal found 17/8£580

Wed 30/909:55 -

2 stops28h 20m

Wed 7/1006:10 -

2 stops21h 05m

Deal found 16/8£586

Tue 29/916:00 -

2 stops22h 50m

Tue 6/1008:50 -

3 stops36h 15m

Deal found 15/8£590

Sun 27/923:20 -

2 stops16h 40m

Sun 4/1022:10 -

3 stops25h 50m

Deal found 13/8£610

Sat 7/1121:45 -

1 stop12h 30m

Sun 15/1106:30 -

1 stop18h 25m

Deal found 16/8£856

Fri 11/917:30 -

1 stop18h 25m

Wed 16/909:50 -

2 stops18h 33m

Deal found 15/8£871

Thu 22/1020:30 -

2 stops17h 10m

Tue 27/1007:20 -

2 stops16h 10m

Deal found 17/8£617

Fri 25/912:25 -

2 stops23h 30m

Sun 4/1009:45 -

1 stop10h 50m

Deal found 13/8£881

Mon 7/1218:05 -

2 stops12h 50m

Fri 11/1208:35 -

2 stops15h 55m

Deal found 17/8£895

Mon 28/920:30 -

2 stops19h 25m

Tue 6/1007:00 -

2 stops17h 35m

Deal found 17/8£672

Mon 14/920:30 -

2 stops19h 10m

Sun 20/920:20 -

2 stops29h 15m

Deal found 16/8£704

Find flight deals from Dulles Intl to Belfast

Round-trip from	£566
One-way from	£217

25/10-7/11
6 total stops
55h 35m total
Washington, D.C. to Belfast

Search Deals

29/9
2 total stops
27h 25m total
Washington, D.C. to Belfast

Search Deals

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

Cheapest return flight

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Sun 25/10

20:40-21:20

3 stops20h 40m

Belfast Intl

Sat 7/11

13:10-19:05

3 stops34h 55m

£566

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Thu 22/10

20:30-19:20

2 stops17h 50m

Belfast Intl

Tue 27/10

08:25-20:05

3 stops39h 40m

£580

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Wed 30/9

09:55-19:15

2 stops28h 20m

Belfast Intl

Wed 7/10

06:10-22:15

2 stops21h 05m

£586

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Tue 29/9

16:00-19:50

2 stops22h 50m

Belfast Intl

Tue 6/10

08:50-16:05

3 stops36h 15m

£590

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Sun 27/9

23:20-21:00

2 stops16h 40m

Belfast Intl

Sun 4/10

22:10-19:00

3 stops25h 50m

£610

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BHD Belfast City

IADBHD

Washington, D.C. Dulles Intl

Thu 22/10

20:30-18:40

2 stops17h 10m

Belfast City

Tue 27/10

07:20-19:30

2 stops16h 10m

£617

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Mon 28/9

20:30-20:55

2 stops19h 25m

Belfast Intl

Tue 6/10

07:00-19:35

2 stops17h 35m

£672

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BFS Belfast Intl

IADBFS

Washington, D.C. Dulles Intl

Mon 14/9

20:30-20:40

2 stops19h 10m

Belfast Intl

Sun 20/9

20:20-20:35

2 stops29h 15m

£704

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BHD Belfast City

IADBHD

Washington, D.C. Dulles Intl

Wed 9/12

21:55-14:35

1 stop11h 40m

Belfast City

Sun 13/12

20:30-19:55

1 stop28h 25m

£766

Washington, D.C.Belfast

IAD Washington, D.C. Dulles Intl - BHD Belfast City

IADBHD

Washington, D.C. Dulles Intl

Thu 19/11

18:20-16:50

2 stops17h 30m

Belfast City

Wed 25/11

09:45-23:21

2 stops18h 36m

£829

Flights are sorted by cheapest return flights first.

Deals found on 16/8

Showing 1-10 of 30 resultsSorted by cheapest first

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.

IAD-BF1

IAD-BFS

IAD-BHD

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

IAD-BF1

IAD-BFS

IAD-BHD

No data available for this route at this time. Please check back soon.

Related info for your journey

How long is the flight from Washington, D.C. Dulles Intl Airport to Belfast?
For as low as £766, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 11h 40m. The distance from Washington, D.C. Dulles Intl Airport to Belfast is about 3390 mi. Both multi-stop and direct flights can be found to your destination and back.
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.

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 £217

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 29/9. 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

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 18 August 2026.

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 18 August 2026.

Best flights from Dulles Intl to BelfastDiscover 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 18 August 2026.

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 18 August 2026.

Last-minute flights from Dulles Intl to BelfastDiscover last-minute flight deals from Dulles Intl to Belfast. Data last updated 18 August 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Belfast. Data last updated 18 August 2026 and is based on user searches.

One-way flights from Dulles Intl to BelfastSearch for one-way flight options from Dulles Intl to Belfast. Find affordable one-way fares based on user searches. Data last updated 18 August 2026.

Search for one-way flight options from Dulles Intl to Belfast. Find affordable one-way fares based on user searches. Data last updated 18 August 2026.

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Best time to book a flight from Dulles Intl to Belfast

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Related info for your journey

How long is the flight from Washington, D.C. Dulles Intl Airport to Belfast?

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?

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.

Direct flights to Northern Ireland

Book a non-stop flight to one of these other cities located in Northern Ireland.

Search flights from Dulles Intl to Belfast by cabin class

Find flights from Dulles Intl to Belfast, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Dulles Intl and Belfast flights

Browse other Dulles Intl and Belfast flight options. Last updated on 18 August 2026.

Other flights from Dulles Intl

Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on 18 August 2026.

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

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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 18 August 2026.

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 18 August 2026.

Last-minute flights from Dulles Intl to Belfast
Discover last-minute flight deals from Dulles Intl to Belfast. Data last updated 18 August 2026 and is based on user searches.

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 18 August 2026.