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Cheap flights from Washington to Belfast from $284

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 to Belfast departing on 8/23. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:00 pm - 9:05 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
18h 05m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
8:20 am - 8:40 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
20h 20m2 stops London Gatwick Reykjavik Keflavik Intl
$907Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
7:00 pm - 11:20 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
20h 20m3 stops Reykjavik Keflavik Intl Glasgow Intl London Luton
Multiple Airlines Logo
6:15 am - 8:40 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
22h 25m2 stops London Gatwick Reykjavik Keflavik Intl
$958Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
3:40 pm - 9:00 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
21h 20m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
7:00 am - 5:55 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
42h 55m3 stops London Stansted Stockholm Arlanda Reykjavik Keflavik Intl
$1,004Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
7:00 pm - 11:20 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
20h 20m3 stops Reykjavik Keflavik Intl Glasgow Intl London Stansted
Multiple Airlines Logo
6:15 am - 6:32 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
20h 17m3 stops London Gatwick Zurich Vancouver Intl
$1,021Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
7:00 pm - 9:30 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
18h 30m2 stops Reykjavik Keflavik Intl Edinburgh Turnhouse
Multiple Airlines Logo
8:15 am - 6:45 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
42h 30m3 stops London Gatwick Toronto Pearson Intl Calgary
$1,052Multiple Airlines
Sat, Sep 5 - Mon, Sep 21
Multiple Airlines Logo
7:00 pm - 9:35 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
18h 35m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Edinburgh Turnhouse
Multiple Airlines Logo
10:25 pm - 9:40 amBFS  Belfast Intl-SEA Seattle/Tacoma Intl
43h 15m3 stops Glasgow Intl Dublin Calgary
$1,063Multiple Airlines
Mon, Aug 24 - Sat, Aug 29
Multiple Airlines Logo
7:00 pm - 7:40 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
16h 40m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
8:15 am - 11:45 amBFS  Belfast Intl-SEA Seattle/Tacoma Intl
35h 30m2 stops London Gatwick Reykjavik Keflavik Intl
$1,072Multiple Airlines
Tue, Sep 1 - Mon, Sep 7
Multiple Airlines Logo
7:00 am - 1:55 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
22h 55m3 stops Calgary Halifax Intl Amsterdam Schiphol
Multiple Airlines Logo
9:10 pm - 9:40 amBFS  Belfast Intl-SEA Seattle/Tacoma Intl
44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary
$1,091Multiple Airlines
Sun, Sep 6 - Sun, Sep 13
Multiple Airlines Logo
3:40 pm - 3:55 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
16h 15m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
6:10 am - 9:40 amBFS  Belfast Intl-SEA Seattle/Tacoma Intl
35h 30m3 stops London Gatwick Montreal Pierre Elliott Trudeau Intl Calgary
$1,101Multiple Airlines
Wed, Sep 2 - Wed, Sep 9
Multiple Airlines Logo
3:40 pm - 9:30 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
21h 50m2 stops Reykjavik Keflavik Intl Manchester
Multiple Airlines Logo
9:10 pm - 9:40 amBFS  Belfast Intl-SEA Seattle/Tacoma Intl
44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary
$1,104Multiple Airlines
Sun, Sep 6 - Sun, Sep 13

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momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 9, 2026.
Use the filters below to find and compare flights from Washington to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-9:05 pm

2 stops18h 05m

Belfast Intl

Tue 9/29

8:20 am-8:40 pm

2 stops20h 20m

$907

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-11:20 pm

3 stops20h 20m

Belfast Intl

Tue 9/29

6:15 am-8:40 pm

2 stops22h 25m

$958

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sun 9/20

3:40 pm-9:00 pm

2 stops21h 20m

Belfast Intl

Sun 9/27

7:00 am-5:55 pm

3 stops42h 55m

$1,004

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-11:20 pm

3 stops20h 20m

Belfast Intl

Tue 9/29

6:15 am-6:32 pm

3 stops20h 17m

$1,021

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sat 9/5

7:00 pm-9:30 pm

2 stops18h 30m

Belfast Intl

Mon 9/21

8:15 am-6:45 pm

3 stops42h 30m

$1,052

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Mon 8/24

7:00 pm-9:35 pm

3 stops18h 35m

Belfast Intl

Sat 8/29

10:25 pm-9:40 am

3 stops43h 15m

$1,063

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 9/1

7:00 pm-7:40 pm

2 stops16h 40m

Belfast Intl

Mon 9/7

8:15 am-11:45 am

2 stops35h 30m

$1,072

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sun 9/6

7:00 am-1:55 pm

3 stops22h 55m

Belfast Intl

Sun 9/13

9:10 pm-9:40 am

3 stops44h 30m

$1,091

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Wed 9/2

3:40 pm-3:55 pm

2 stops16h 15m

Belfast Intl

Wed 9/9

6:10 am-9:40 am

3 stops35h 30m

$1,101

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sun 9/6

3:40 pm-9:30 pm

2 stops21h 50m

Belfast Intl

Sun 9/13

9:10 pm-9:40 am

3 stops44h 30m

$1,104

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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Cheap State of Washington to Belfast Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Belfast Intl Airport

Fastest flight time

12h 30m

Direct flights

None
The fastest flight from State of Washington to Belfast Intl Airport takes 12h 30m
There are no direct flights from State of Washington to Belfast Intl Airport. There are no popular flight routes from State of Washington to Belfast Intl Airport.
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Frequently asked questions about flying from Washington to Belfast Intl Airport

  • When did momondo last update prices for flights from Washington to Belfast Intl Airport?

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

  • How many operators does momondo search for flights from Washington to Belfast Intl Airport?

  • How old do you have to be to fly from Washington to Belfast Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington to Belfast Intl Airport.

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

    The travel and health documents required for your trip to Belfast Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belfast Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from State of Washington to Belfast Intl Airport

Compare and see reviews for airlines that fly from State of Washington to Belfast Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $822Free CancellationRating
6.7
8,151 reviews
Search British Airways flights

Frequently asked questions about flying from Washington to Belfast Intl Airport

  • How do I get Price Alerts for flights from State of Washington to Belfast Intl Airport?

    Search flight deals from State of Washington to Belfast Intl Airport. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from State of Washington to Belfast Intl Airport with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • 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 to Belfast?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington to Belfast. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Washington to Belfast with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington to Belfast flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington to Belfast?

Once you have performed a search for Washington 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 to Belfast right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington 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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