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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £264

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Belfast departing on 13/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
20:30 - 19:40IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
18h 10m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
17:10 - 22:15BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
34h 05m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
£575Multiple Airlines
Tue, 22 Sep - Tue, 29 Sep
Multiple Airlines Logo
09:55 - 19:50IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
28h 55m2 stops Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
21:15 - 15:25BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
23h 10m2 stops Glasgow Intl Toronto Pearson Intl
£586Multiple Airlines
Tue, 22 Sep - Tue, 29 Sep
Multiple Airlines Logo
16:00 - 19:50IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
22h 50m2 stops Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
20:15 - 15:10BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops London Stansted Madrid Barajas Lisbon Humberto Delgado
£610Multiple Airlines
Tue, 29 Sep - Tue, 6 Oct
Multiple Airlines Logo
23:20 - 21:00IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
16h 40m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
22:10 - 19:00BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
25h 50m3 stops London Luton Madrid Barajas Casablanca Mohamed V
£612Multiple Airlines
Sun, 27 Sep - Sun, 4 Oct
Multiple Airlines Logo
09:45 - 19:50IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
29h 05m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
20:15 - 15:10BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops London Stansted Madrid Barajas Lisbon Humberto Delgado
£614Multiple Airlines
Tue, 29 Sep - Tue, 6 Oct
Multiple Airlines Logo
17:05 - 14:00IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
15h 55m2 stops Lisbon Humberto Delgado London Gatwick
Multiple Airlines Logo
08:20 - 15:10BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
35h 50m2 stops London Gatwick Lisbon Humberto Delgado
£624Multiple Airlines
Tue, 29 Sep - Tue, 6 Oct
Multiple Airlines Logo
20:30 - 16:20IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
14h 50m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
10:30 - 19:20BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
13h 50m2 stops Glasgow Intl Reykjavik Keflavik Intl
£626Multiple Airlines
Tue, 22 Sep - Tue, 29 Sep
Multiple Airlines Logo
20:30 - 22:45IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
21h 15m3 stops Reykjavik Keflavik Intl Dublin Edinburgh Turnhouse
Multiple Airlines Logo
17:10 - 22:15BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
34h 05m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
£629Multiple Airlines
Tue, 22 Sep - Tue, 29 Sep
Multiple Airlines Logo
17:45 - 19:40IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
20h 55m2 stops Lisbon Humberto Delgado London Gatwick
Multiple Airlines Logo
08:15 - 15:10BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
35h 55m2 stops London Gatwick Lisbon Humberto Delgado
£631Multiple Airlines
Wed, 23 Sep - Wed, 30 Sep
Multiple Airlines Logo
09:45 - 18:25IAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
27h 40m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
20:15 - 15:10BFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops London Stansted Madrid Barajas Lisbon Humberto Delgado
£637Multiple Airlines
Sun, 11 Oct - Sat, 17 Oct

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British Airways flights from Washington, D.C. Dulles Intl Airport to Belfast

Our best British Airways deals on Washington, D.C. Dulles Intl Airport to Belfast flight tickets
British Airways
10 Jan
IAD18:05Washington, D.C. Dulles Intl
11h 15m
1 stop
BHD10:20Belfast City
14 Jan
BHD09:05Belfast City
11h 35m
1 stop
IAD15:40Washington, D.C. Dulles Intl
£708
British Airways
9 Dec
IAD21:55Washington, D.C. Dulles Intl
11h 40m
1 stop
BHD14:35Belfast City
13 Dec
BHD20:25Belfast City
28h 30m
1 stop
IAD19:55Washington, D.C. Dulles Intl
£760
British Airways
9 Dec
IAD21:55Washington, D.C. Dulles Intl
11h 40m
1 stop
BHD14:35Belfast City
13 Dec
BHD20:30Belfast City
28h 25m
1 stop
IAD19:55Washington, D.C. Dulles Intl
£768

Aer Lingus flights from Washington, D.C. Dulles Intl Airport to Belfast

Our best Aer Lingus deals on Washington, D.C. Dulles Intl Airport to Belfast flight tickets
Aer Lingus
11 Sept
IAD17:15Washington, D.C. Dulles Intl
15h 55m
2 stops
BHD14:10Belfast City
16 Sept
BHD07:00Belfast City
17h 25m
2 stops
IAD19:25Washington, D.C. Dulles Intl
£850
Aer Lingus
24 Aug
IAD20:55Washington, D.C. Dulles Intl
14h 40m
2 stops
BHD16:35Belfast City
29 Aug
BHD09:50Belfast City
14h 20m
2 stops
IAD19:10Washington, D.C. Dulles Intl
£873
Aer Lingus
24 Aug
IAD20:55Washington, D.C. Dulles Intl
14h 40m
2 stops
BHD16:35Belfast City
27 Aug
BHD18:20Belfast City
26h 25m
2 stops
IAD15:45Washington, D.C. Dulles Intl
£884

momondo Fare Finder

 
Customise your flight search to find flights from Washington, D.C. Dulles Intl Airport to Belfast that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 15 August 2026.
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

Tue 22/9

20:30-19:40

2 stops18h 10m

Belfast Intl

Tue 29/9

17:10-22:15

3 stops34h 05m

£575

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 22/9

09:55-19:50

2 stops28h 55m

Belfast Intl

Tue 29/9

21:15-15:25

2 stops23h 10m

£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

20:15-15:10

3 stops47h 55m

£610

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

£612

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 29/9

09:45-19:50

3 stops29h 05m

Belfast Intl

Tue 6/10

20:15-15:10

3 stops47h 55m

£614

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 29/9

17:05-14:00

2 stops15h 55m

Belfast Intl

Tue 6/10

08:20-15:10

2 stops35h 50m

£624
Fastest return journey

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 22/9

20:30-16:20

2 stops14h 50m

Belfast Intl

Tue 29/9

10:30-19:20

2 stops13h 50m

£626

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 22/9

20:30-22:45

3 stops21h 15m

Belfast Intl

Tue 29/9

17:10-22:15

3 stops34h 05m

£628

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Wed 23/9

17:45-19:40

2 stops20h 55m

Belfast Intl

Wed 30/9

08:15-15:10

2 stops35h 55m

£631

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sun 11/10

09:45-18:25

3 stops27h 40m

Belfast Intl

Sat 17/10

20:15-15:10

3 stops47h 55m

£637

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Belfast from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Belfast

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Washington, D.C. Dulles Intl to Belfast?

Aer Lingus, Air France, and Delta are the most popular carriers operating from Washington, D.C. Dulles Intl to Belfast

Cheap Washington, D.C. Dulles Intl Airport to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Belfast

Fastest flight time

11h 40m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Belfast takes 11h 40m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Belfast. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Belfast.
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Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Belfast

  • How far is Washington, D.C. Dulles Intl to Belfast by plane?

    Washington, D.C. Dulles Intl and Belfast are 3387.7 mi apart from one another. By plane, this route typically takes 11h 40m.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Belfast?

    Prices for flights from Washington, D.C. Dulles Intl Airport to Belfast are refreshed on a daily basis.

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Belfast?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Belfast.

  • What documentation or ID do you need to fly to Belfast?

    The travel and health documents you'll need for your trip to Belfast may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Belfast. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Belfast?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Belfast for you.

Can I find flights from Washington, D.C. to Belfast with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Belfast from Washington, D.C. with this policy.

How can momondo help me find flights from Washington, D.C. to Belfast?

Once you have performed a search for Washington, D.C. to Belfast flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Washington, D.C. to Belfast right now. Can momondo alert me if prices change?

Price alerts on flights to Belfast from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport