Latest deals
Insights
FAQs
Price Alerts

Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from $357

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 9/13. 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 round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:30 pm - 7:40 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
18h 10m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
5:10 pm - 10:15 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
34h 05m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
$777Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
9:55 am - 7:50 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
28h 55m2 stops Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
9:15 pm - 3:25 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
23h 10m2 stops Glasgow Intl Toronto Pearson Intl
$793Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
11:20 pm - 9:00 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
16h 40m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
10:10 pm - 7:00 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
25h 50m3 stops London Luton Madrid Barajas Casablanca Mohamed V
$827Multiple Airlines
Sun, Sep 27 - Sun, Oct 4
Multiple Airlines Logo
11:20 pm - 9:00 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
16h 40m2 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 Stansted Madrid Barajas Lisbon Humberto Delgado
$827Multiple Airlines
Sun, Oct 11 - Sat, Oct 17
Multiple Airlines Logo
8:30 pm - 4:20 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
14h 50m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
10:30 am - 7:20 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
13h 50m2 stops Glasgow Intl Reykjavik Keflavik Intl
$846Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
8:30 pm - 10:45 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
21h 15m3 stops Reykjavik Keflavik Intl Dublin Edinburgh Turnhouse
Multiple Airlines Logo
5:10 pm - 10:15 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
34h 05m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
$850Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
5:45 pm - 7:40 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
20h 55m2 stops Lisbon Humberto Delgado London Gatwick
Multiple Airlines Logo
8:15 am - 3:10 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
35h 55m2 stops London Gatwick Lisbon Humberto Delgado
$854Multiple Airlines
Wed, Sep 23 - Wed, Sep 30
Multiple Airlines Logo
9:45 am - 6:25 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
27h 40m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
8:15 pm - 3:10 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
47h 55m3 stops London Stansted Madrid Barajas Lisbon Humberto Delgado
$861Multiple Airlines
Sun, Oct 11 - Sat, Oct 17
Multiple Airlines Logo
9:55 am - 3:55 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
25h 00m2 stops Toronto Pearson Intl Glasgow Intl
Multiple Airlines Logo
6:10 am - 3:10 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
38h 00m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Toronto Island
$870Multiple Airlines
Wed, Sep 23 - Wed, Sep 30
Multiple Airlines Logo
11:20 pm - 10:35 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
18h 15m3 stops Reykjavik Keflavik Intl Glasgow Intl London Stansted
Multiple Airlines Logo
4:30 pm - 7:00 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
31h 30m3 stops Malaga Madrid Barajas Casablanca Mohamed V
$877Multiple Airlines
Sun, Sep 27 - Sun, Oct 4

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
Jan 10
IAD6:05 pmWashington, D.C. Dulles Intl
11h 15m
1 stop
BHD10:20 amBelfast City
Jan 14
BHD9:05 amBelfast City
11h 35m
1 stop
IAD3:40 pmWashington, D.C. Dulles Intl
$957
British Airways
Dec 9
IAD9:55 pmWashington, D.C. Dulles Intl
11h 40m
1 stop
BHD2:35 pmBelfast City
Dec 13
BHD8:25 pmBelfast City
28h 30m
1 stop
IAD7:55 pmWashington, D.C. Dulles Intl
$1,028
British Airways
Dec 9
IAD9:55 pmWashington, D.C. Dulles Intl
11h 40m
1 stop
BHD2:35 pmBelfast City
Dec 13
BHD8:30 pmBelfast City
28h 25m
1 stop
IAD7:55 pmWashington, D.C. Dulles Intl
$1,038

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

Our best KLM deals on Washington, D.C. Dulles Intl Airport to Belfast flight tickets
KLM
Sep 2
IAD6:10 pmWashington, D.C. Dulles Intl
10h 10m
1 stop
BHD9:20 amBelfast City
Sep 8
BHD9:50 amBelfast City
10h 45m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$1,121
KLM
Dec 22
IAD5:45 pmWashington, D.C. Dulles Intl
10h 25m
1 stop
BHD9:10 amBelfast City
Jan 19
BHD9:40 amBelfast City
18h 22m
2 stops
IAD11:02 pmWashington, D.C. Dulles Intl
$1,160
KLM
Dec 22
IAD5:45 pmWashington, D.C. Dulles Intl
18h 05m
1 stop
BHD4:50 pmBelfast City
Jan 18
BHD9:40 amBelfast City
18h 22m
2 stops
IAD11:02 pmWashington, D.C. Dulles Intl
$1,210

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated August 15, 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 round-trip

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 9/22

8:30 pm-7:40 pm

2 stops18h 10m

Belfast Intl

Tue 9/29

5:10 pm-10:15 pm

3 stops34h 05m

$777

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 9/22

9:55 am-7:50 pm

2 stops28h 55m

Belfast Intl

Tue 9/29

9:15 pm-3:25 pm

2 stops23h 10m

$793

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sun 9/27

11:20 pm-9:00 pm

2 stops16h 40m

Belfast Intl

Sun 10/4

10:10 pm-7:00 pm

3 stops25h 50m

$827

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sun 10/11

11:20 pm-9:00 pm

2 stops16h 40m

Belfast Intl

Sat 10/17

8:15 pm-3:10 pm

3 stops47h 55m

$827
Quickest round-trip

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 9/22

8:30 pm-4:20 pm

2 stops14h 50m

Belfast Intl

Tue 9/29

10:30 am-7:20 pm

2 stops13h 50m

$846

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 9/22

8:30 pm-10:45 pm

3 stops21h 15m

Belfast Intl

Tue 9/29

5:10 pm-10:15 pm

3 stops34h 05m

$850

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Wed 9/23

5:45 pm-7:40 pm

2 stops20h 55m

Belfast Intl

Wed 9/30

8:15 am-3:10 pm

2 stops35h 55m

$854

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sun 10/11

9:45 am-6:25 pm

3 stops27h 40m

Belfast Intl

Sat 10/17

8:15 pm-3:10 pm

3 stops47h 55m

$861

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Wed 9/23

9:55 am-3:55 pm

2 stops25h 00m

Belfast Intl

Wed 9/30

6:10 am-3:10 pm

3 stops38h 00m

$870

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Sun 9/27

11:20 pm-10:35 pm

3 stops18h 15m

Belfast Intl

Sun 10/4

4:30 pm-7:00 pm

3 stops31h 30m

$877

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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.
Search flight deals

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?

    The straight-line distance from Washington, D.C. Dulles Intl to Belfast is 3387.7 mi. Flights usually cover this in 11h 40m, depending on flying conditions and air traffic around both airports.

  • 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 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. 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?

It is quick and easy to find Washington, D.C. to Belfast flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Belfast that suits 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?

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.

An easier way to manage your Belfast trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 9/14
Mon 9/21
By creating a price alert you accept our terms of use and privacy policy.

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