Latest deals
When to book
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
4:00 pm - 7:50 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
22h 50m2 stops Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
8:50 am - 4:05 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
36h 15m3 stops London Stansted Madrid Barajas Paris Charles de Gaulle
$800Multiple Airlines
Tue, Sep 29 - Tue, Oct 6
Multiple Airlines Logo
9:45 am - 7:50 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
29h 05m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Edinburgh Turnhouse
Multiple Airlines Logo
8:50 am - 8:10 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
40h 20m3 stops London Stansted Madrid Barajas Paris Charles de Gaulle
$804Multiple Airlines
Tue, Sep 29 - Tue, Oct 6
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
5:05 pm - 9:05 pmIAD  Washington, D.C. Dulles Intl-BFS Belfast Intl
23h 00m2 stops Lisbon Humberto Delgado London Gatwick
Multiple Airlines Logo
8:20 am - 3:10 pmBFS  Belfast Intl-IAD Washington, D.C. Dulles Intl
35h 50m2 stops London Gatwick Lisbon Humberto Delgado
$839Multiple Airlines
Tue, Sep 29 - Tue, Oct 6
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

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

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport 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 Intl Airport 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

Tue 9/29

4:00 pm-7:50 pm

2 stops22h 50m

Belfast Intl

Tue 10/6

8:50 am-4:05 pm

3 stops36h 15m

$800

Washington, D.C.Belfast

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

IADBFS

Washington, D.C. Dulles Intl

Tue 9/29

9:45 am-7:50 pm

3 stops29h 05m

Belfast Intl

Tue 10/6

8:50 am-8:10 pm

3 stops40h 20m

$804

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

Tue 9/29

5:05 pm-9:05 pm

2 stops23h 00m

Belfast Intl

Tue 10/6

8:20 am-3:10 pm

2 stops35h 50m

$839
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

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to Belfast Intl Airport (IAD to BFS) 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 Intl Airport

Fastest flight time

11h 40m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport takes 11h 40m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport.
Search flight deals

Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport

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

    Belfast Intl is 3375.6 mi away from Washington, D.C. Dulles Intl. 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 Intl Airport?

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

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

    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 Intl Airport.

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

    The travel and health documents you'll need for your trip to Belfast Intl Airport 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 Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport

  • How do I get Price Alerts for flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport?

    Price Alerts will notify you by email when the price for flights to Belfast Intl Airport from Washington, D.C. Dulles Intl Airport decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from Washington, D.C. Dulles Intl Airport to Belfast Intl Airport with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Armagh
Ballymena
Newry
Dungannon

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from Washington, D.C..

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

Flights from Washington, D.C. to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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.

An easier way to manage your Belfast Intl Airport 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 Belfast

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to London Heathrow Airportfrom $492
Flights to London Gatwick Airportfrom $387
Flights to London Stansted Airportfrom $488
Flights to London City Airportfrom $671
Flights to London Luton Airportfrom $503
Flights to Glasgow Intl Airportfrom $582
Flights to London Southend Airportfrom $637
Flights to Belfast City Airportfrom $638