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Cheap flights from Washington, D.C. to Belfast from $285

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. to Belfast departing on 10/5. 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. to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:30 pm - 9:00 pmBWI  Baltimore/Washington-BFS Belfast Intl
19h 30m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
3:50 pm - 10:15 pmBFS  Belfast Intl-BWI Baltimore/Washington
35h 25m2 stops London Gatwick Reykjavik Keflavik Intl
$745Multiple Airlines
Sun, Sep 27 - Mon, Oct 12
British Airways Logo
7:15 pm - 12:00 pmIAD  Washington, D.C. Dulles Intl-BHD Belfast City
11h 45m1 stop London Heathrow
British Airways Logo
9:40 am - 8:20 pmBHD  Belfast City-IAD Washington, D.C. Dulles Intl
15h 40m1 stop London Heathrow
$759British Airways
Wed, Oct 7 - Mon, Oct 12
Multiple Airlines Logo
11:20 pm - 4:20 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
12h 00m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
8:15 pm - 3:10 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops London Luton Madrid Barajas Lisbon Humberto Delgado
$770Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
8:30 pm - 11:25 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
21h 55m2 stops Reykjavik Keflavik Intl Manchester
Multiple Airlines Logo
6:45 am - 3:45 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
38h 00m3 stops Malaga Casablanca Mohamed V Riyadh King Khaled Intl
$772Multiple Airlines
Sat, Sep 19 - Sat, Sep 26
Multiple Airlines Logo
8:30 pm - 9:25 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
19h 55m2 stops Reykjavik Keflavik Intl Manchester
Multiple Airlines Logo
10:25 am - 5:20 amBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops Liverpool J. Lennon Madrid Barajas Bogotá El Dorado
$786Multiple Airlines
Sat, Oct 17 - Thu, Oct 22
Multiple Airlines Logo
8:30 pm - 9:25 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
19h 55m2 stops Reykjavik Keflavik Intl Manchester
Multiple Airlines Logo
9:10 pm - 7:00 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
26h 50m2 stops Alicante Casablanca Mohamed V
$794Multiple Airlines
Sat, Oct 17 - Thu, Oct 22
Multiple Airlines Logo
8:30 pm - 11:25 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
21h 55m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Manchester
Multiple Airlines Logo
10:25 am - 5:20 amBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops Liverpool J. Lennon Madrid Barajas Bogotá El Dorado
$796Multiple Airlines
Sat, Oct 17 - Thu, Oct 22
British Airways Logo
9:30 pm - 3:40 pmBWI  Baltimore/Washington-BHD Belfast City
13h 10m1 stop London Heathrow
British Airways Logo
11:35 am - 7:40 pmBHD  Belfast City-BWI Baltimore/Washington
13h 05m1 stop London Heathrow
$798British Airways
Wed, Oct 7 - Mon, Oct 12
Multiple Airlines Logo
8:30 pm - 11:35 pmBWI  Baltimore/Washington-BFS Belfast Intl
22h 05m3 stops Reykjavik Keflavik Intl Glasgow Intl Birmingham
Multiple Airlines Logo
3:50 pm - 10:15 pmBFS  Belfast Intl-BWI Baltimore/Washington
35h 25m2 stops London Gatwick Reykjavik Keflavik Intl
$799Multiple Airlines
Sun, Sep 27 - Mon, Oct 12
Multiple Airlines Logo
8:30 pm - 8:30 pmIAD  Washington, D.C. Dulles Intl-BHD Belfast City
19h 00m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
8:05 am - 7:00 pmBHD  Belfast City-IAD Washington, D.C. Dulles Intl
39h 55m3 stops London Luton Madrid Barajas Casablanca Mohamed V
$805Multiple Airlines
Mon, Sep 21 - Tue, Oct 6

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KLM flights from Washington, D.C. to Belfast

Our best KLM deals on Washington, D.C. to Belfast flight tickets
KLM
Jan 27
IAD11:05 amWashington, D.C. Dulles Intl
17h 05m
2 stops
BHD9:10 amBelfast City
Feb 2
BHD9:40 amBelfast City
18h 22m
2 stops
IAD11:02 pmWashington, D.C. Dulles Intl
$1,019
KLM
Sep 21
IAD12:25 pmWashington, D.C. Dulles Intl
15h 55m
2 stops
BHD9:20 amBelfast City
Oct 6
BHD9:50 amBelfast City
18h 26m
2 stops
IAD11:16 pmWashington, D.C. Dulles Intl
$1,020
KLM
Sep 21
DCA6:10 amWashington, D.C. Reagan-National
22h 10m
2 stops
BHD9:20 amBelfast City
Oct 5
BHD5:30 pmBelfast City
28h 07m
2 stops
DCA4:37 pmWashington, D.C. Reagan-National
$1,029

American Airlines flights from Washington, D.C. to Belfast

Our best American Airlines deals on Washington, D.C. to Belfast flight tickets
American Airlines
Jan 28
IAD5:46 pmWashington, D.C. Dulles Intl
14h 04m
2 stops
BHD12:50 pmBelfast City
Feb 2
BHD8:45 amBelfast City
16h 10m
1 stop
IAD7:55 pmWashington, D.C. Dulles Intl
$1,039
American Airlines
Sep 21
BWI7:09 pmBaltimore/Washington
15h 21m
2 stops
BHD3:30 pmBelfast City
Oct 6
BHD1:45 pmBelfast City
10h 55m
1 stop
BWI7:40 pmBaltimore/Washington
$1,040
American Airlines
Jan 28
IAD5:46 pmWashington, D.C. Dulles Intl
14h 04m
2 stops
BHD12:50 pmBelfast City
Feb 2
BHD8:45 amBelfast City
19h 27m
2 stops
IAD11:12 pmWashington, D.C. Dulles Intl
$1,049

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 832,500 searches. Data last updated August 6, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BaltimoreBelfast

BWI Baltimore/Washington - BFS Belfast Intl

BWIBFS

Baltimore/Washington

Sun 9/27

8:30 pm-9:00 pm

2 stops19h 30m

Belfast Intl

Mon 10/12

3:50 pm-10:15 pm

2 stops35h 25m

$745

Washington, D.C.Belfast

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

IADBHD

Washington, D.C. Dulles Intl

Wed 10/7

7:15 pm-12:00 pm

1 stop11h 45m

Belfast City

Mon 10/12

9:40 am-8:20 pm

1 stop15h 40m

$759

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 9/1

11:20 pm-4:20 pm

2 stops12h 00m

Belfast Intl

Mon 9/7

8:15 pm-3:10 pm

3 stops47h 55m

$770

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sat 9/19

8:30 pm-11:25 pm

2 stops21h 55m

Belfast Intl

Sat 9/26

6:45 am-3:45 pm

3 stops38h 00m

$772

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sat 10/17

8:30 pm-9:25 pm

2 stops19h 55m

Belfast Intl

Thu 10/22

10:25 am-5:20 am

3 stops47h 55m

$786

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sat 10/17

8:30 pm-9:25 pm

2 stops19h 55m

Belfast Intl

Thu 10/22

9:10 pm-7:00 pm

2 stops26h 50m

$794

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sat 10/17

8:30 pm-11:25 pm

3 stops21h 55m

Belfast Intl

Thu 10/22

10:25 am-5:20 am

3 stops47h 55m

$796
Quickest round-trip

BaltimoreBelfast

BWI Baltimore/Washington - BHD Belfast City

BWIBHD

Baltimore/Washington

Wed 10/7

9:30 pm-3:40 pm

1 stop13h 10m

Belfast City

Mon 10/12

11:35 am-7:40 pm

1 stop13h 05m

$798

BaltimoreBelfast

BWI Baltimore/Washington - BFS Belfast Intl

BWIBFS

Baltimore/Washington

Sun 9/27

8:30 pm-11:35 pm

3 stops22h 05m

Belfast Intl

Mon 10/12

3:50 pm-10:15 pm

2 stops35h 25m

$799

Washington, D.C.Belfast

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

IADBHD

Washington, D.C. Dulles Intl

Mon 9/21

8:30 pm-8:30 pm

2 stops19h 00m

Belfast City

Tue 10/6

8:05 am-7:00 pm

3 stops39h 55m

$805

Flights are sorted by cheapest round-trip 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. 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. to Belfast?

KLM, Aer Lingus, and Delta are the most popular carriers operating from Washington, D.C. to Belfast

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

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

Fastest flight time

11h 10m

Direct flights

None
The fastest flight from Washington, D.C. to Belfast takes 11h 10m
There are no direct flights from Washington, D.C. to Belfast. There are no popular flight routes from Washington, D.C. to Belfast.
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Frequently asked questions about flying from Washington, D.C. to Belfast

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

    Washington, D.C. and Belfast are 3373.5 mi apart from one another. In terms of flight time, this usually takes a little over 11h 10m.

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

    Prices for flights from Washington, D.C. to Belfast refresh daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Belfast.

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

    The necessary travel and health documents for your Belfast trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking 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. All flights to Belfast from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Belfast from Washington, D.C..

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

Of course. momondo tracks the price of Washington, D.C. to Belfast flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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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