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Cheap flights from Northern Ireland to Washington from £324

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Northern Ireland to Washington departing on 31/8. 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 Northern Ireland to Washington

Cheap return flights

Enter your travel dates to find the best prices.
Iberia Logo
11:35 - 11:35BHD  Belfast City-SEA Seattle/Tacoma Intl
32h 00m1 stop London Heathrow
Iberia Logo
13:30 - 10:10SEA  Seattle/Tacoma Intl-BHD Belfast City
12h 40m1 stop London Heathrow
£641Iberia
Mon, 5 Oct - Thu, 22 Oct
Iberia Logo
11:35 - 00:36BHD  Belfast City-SEA Seattle/Tacoma Intl
21h 01m2 stops London Heathrow Chicago O'Hare Intl
Iberia Logo
15:14 - 15:30SEA  Seattle/Tacoma Intl-BHD Belfast City
16h 16m2 stops Chicago O'Hare Intl London Heathrow
£645Iberia
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
21:10 - 09:40BFS  Belfast Intl-SEA Seattle/Tacoma Intl
44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary
Multiple Airlines Logo
15:40 - 21:00SEA  Seattle/Tacoma Intl-BFS Belfast Intl
21h 20m2 stops Reykjavik Keflavik Intl Glasgow Intl
£653Multiple Airlines
Sun, 27 Sep - Sun, 4 Oct
Multiple Airlines Logo
21:10 - 09:40BFS  Belfast Intl-SEA Seattle/Tacoma Intl
44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary
Multiple Airlines Logo
15:40 - 20:55SEA  Seattle/Tacoma Intl-BFS Belfast Intl
21h 15m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Edinburgh Turnhouse
£666Multiple Airlines
Sun, 27 Sep - Sun, 4 Oct
Multiple Airlines Logo
06:40 - 22:42BFS  Belfast Intl-SEA Seattle/Tacoma Intl
24h 02m3 stops London Stansted Munich Franz Josef Strauss Vancouver Intl
Multiple Airlines Logo
19:00 - 23:05SEA  Seattle/Tacoma Intl-BFS Belfast Intl
20h 05m2 stops Reykjavik Keflavik Intl Glasgow Intl
£700Multiple Airlines
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
06:40 - 22:42BFS  Belfast Intl-SEA Seattle/Tacoma Intl
24h 02m3 stops London Stansted Munich Franz Josef Strauss Vancouver Intl
Multiple Airlines Logo
19:00 - 23:25SEA  Seattle/Tacoma Intl-BFS Belfast Intl
20h 25m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen London Stansted
£704Multiple Airlines
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
06:15 - 09:40BFS  Belfast Intl-SEA Seattle/Tacoma Intl
35h 25m3 stops London Gatwick Halifax Intl Calgary
Multiple Airlines Logo
19:00 - 21:05SEA  Seattle/Tacoma Intl-BFS Belfast Intl
18h 05m2 stops Reykjavik Keflavik Intl London Gatwick
£708Multiple Airlines
Tue, 29 Sep - Tue, 6 Oct
Multiple Airlines Logo
07:10 - 13:45BFS  Belfast Intl-SEA Seattle/Tacoma Intl
14h 35m2 stops Manchester Kastrup Copenhagen
Multiple Airlines Logo
15:55 - 21:30SEA  Seattle/Tacoma Intl-BFS Belfast Intl
21h 35m2 stops Kastrup Copenhagen Manchester
£710Multiple Airlines
Sun, 27 Sep - Sun, 4 Oct
Multiple Airlines Logo
08:20 - 20:40BFS  Belfast Intl-SEA Seattle/Tacoma Intl
20h 20m2 stops London Gatwick Reykjavik Keflavik Intl
Multiple Airlines Logo
19:00 - 21:05SEA  Seattle/Tacoma Intl-BFS Belfast Intl
18h 05m2 stops Reykjavik Keflavik Intl London Gatwick
£711Multiple Airlines
Tue, 29 Sep - Tue, 6 Oct
British Airways Logo
20:00 - 16:50BHD  Belfast City-SEA Seattle/Tacoma Intl
28h 50m1 stop London Heathrow
British Airways Logo
18:45 - 17:25SEA  Seattle/Tacoma Intl-BHD Belfast City
14h 40m1 stop London Heathrow
£720British Airways
Thu, 5 Nov - Mon, 9 Nov

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Iberia flights from Northern Ireland to State of Washington

Our best Iberia deals on Northern Ireland to State of Washington flight tickets
Iberia
5 Oct
BHD11:35Belfast City
32h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
22 Oct
SEA13:30Seattle/Tacoma Intl
12h 40m
1 stop
BHD10:10Belfast City
£641
Iberia
5 Oct
BHD11:35Belfast City
21h 01m
2 stops
SEA00:36Seattle/Tacoma Intl
22 Oct
SEA15:14Seattle/Tacoma Intl
16h 16m
2 stops
BHD15:30Belfast City
£645

British Airways flights from Northern Ireland to State of Washington

Our best British Airways deals on Northern Ireland to State of Washington flight tickets
British Airways
5 Nov
BHD20:00Belfast City
28h 50m
1 stop
SEA16:50Seattle/Tacoma Intl
9 Nov
SEA18:45Seattle/Tacoma Intl
14h 40m
1 stop
BHD17:25Belfast City
£720
British Airways
7 Oct
BHD11:35Belfast City
32h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
11 Oct
SEA20:20Seattle/Tacoma Intl
16h 15m
1 stop
BHD20:35Belfast City
£721
British Airways
5 Nov
BHD06:30Belfast City
12h 55m
1 stop
SEA11:25Seattle/Tacoma Intl
9 Nov
SEA10:41Seattle/Tacoma Intl
21h 24m
2 stops
BHD16:05Belfast City
£722

momondo Fare Finder

 
Customise your flight search to find flights from Northern Ireland to State of Washington 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 16 August 2026.
Use the filters below to find and compare flights from Northern Ireland to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 5/10

11:35-11:35

1 stop32h 00m

Seattle/Tacoma Intl

Thu 22/10

13:30-10:10

1 stop12h 40m

£641

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 5/10

11:35-00:36

2 stops21h 01m

Seattle/Tacoma Intl

Thu 22/10

15:14-15:30

2 stops16h 16m

£645

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

21:10-09:40

3 stops44h 30m

Seattle/Tacoma Intl

Sun 4/10

15:40-21:00

2 stops21h 20m

£653

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

21:10-09:40

3 stops44h 30m

Seattle/Tacoma Intl

Sun 4/10

15:40-20:55

3 stops21h 15m

£666

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 5/10

06:40-22:42

3 stops24h 02m

Seattle/Tacoma Intl

Thu 22/10

19:00-23:05

2 stops20h 05m

£700

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 5/10

06:40-22:42

3 stops24h 02m

Seattle/Tacoma Intl

Thu 22/10

19:00-23:25

3 stops20h 25m

£704

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 29/9

06:15-09:40

3 stops35h 25m

Seattle/Tacoma Intl

Tue 6/10

19:00-21:05

2 stops18h 05m

£708
Fastest return journey

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

07:10-13:45

2 stops14h 35m

Seattle/Tacoma Intl

Sun 4/10

15:55-21:30

2 stops21h 35m

£710

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 29/9

08:20-20:40

2 stops20h 20m

Seattle/Tacoma Intl

Tue 6/10

19:00-21:05

2 stops18h 05m

£711

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 5/11

20:00-16:50

1 stop28h 50m

Seattle/Tacoma Intl

Mon 9/11

18:45-17:25

1 stop14h 40m

£720

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 Washington from

How to get the cheapest flight ticket from Northern Ireland to State of Washington

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 Northern Ireland to Washington?

British Airways is the most popular carrier operating from Northern Ireland to Washington

Cheap Northern Ireland to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Northern Ireland to State of Washington

Fastest flight time

12h 55m

Direct flights

None
The fastest flight from Northern Ireland to State of Washington takes 12h 55m
There are no direct flights from Northern Ireland to State of Washington. There are no popular flight routes from Northern Ireland to State of Washington.
Search flight deals

Frequently asked questions about flying from Northern Ireland to Washington

  • When did momondo last update prices for flights from Northern Ireland to Washington?

    Prices for flights from Northern Ireland to Washington are refreshed on a daily basis.

  • How old do you have to be to fly from Northern Ireland to Washington?

    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 Northern Ireland to Washington.

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

    The travel and health documents required for your trip to Washington 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 Washington. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Why use momondo?

Why should I use momondo to find a flight deal from Northern Ireland to Washington?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Northern Ireland to Washington. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Washington from Northern Ireland on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Northern Ireland to Washington?

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

Yes momondo offers price alerts on flights to Washington from Northern Ireland. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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