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Cheap flights from Northern Ireland to Seattle from £416

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 Seattle departing on 14/9. 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 Seattle

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
11:35 - 11:35BHD  Belfast City-SEA Seattle/Tacoma Intl
32h 00m1 stop London Heathrow
British Airways Logo
20:20 - 20:35SEA  Seattle/Tacoma Intl-BHD Belfast City
16h 15m1 stop London Heathrow
£721British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
10:05 - 18:25BHD  Belfast City-SEA Seattle/Tacoma Intl
16h 20m1 stop London Heathrow
British Airways Logo
06:12 - 14:35SEA  Seattle/Tacoma Intl-BHD Belfast City
24h 23m2 stops Chicago O'Hare Intl London Heathrow
£722British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
11:35 - 11:35BHD  Belfast City-SEA Seattle/Tacoma Intl
32h 00m1 stop London Heathrow
British Airways Logo
20:20 - 20:35SEA  Seattle/Tacoma Intl-BHD Belfast City
16h 15m1 stop London Heathrow
£723British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
10:05 - 00:36BHD  Belfast City-SEA Seattle/Tacoma Intl
22h 31m2 stops London Heathrow Chicago O'Hare Intl
British Airways Logo
15:14 - 17:40SEA  Seattle/Tacoma Intl-BHD Belfast City
18h 26m2 stops Chicago O'Hare Intl London Heathrow
£725British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
11:35 - 00:36BHD  Belfast City-SEA Seattle/Tacoma Intl
21h 01m2 stops London Heathrow Chicago O'Hare Intl
British Airways Logo
06:12 - 14:35SEA  Seattle/Tacoma Intl-BHD Belfast City
24h 23m2 stops Chicago O'Hare Intl London Heathrow
£726British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
10:05 - 00:36BHD  Belfast City-SEA Seattle/Tacoma Intl
22h 31m2 stops London Heathrow Chicago O'Hare Intl
British Airways Logo
15:14 - 17:40SEA  Seattle/Tacoma Intl-BHD Belfast City
18h 26m2 stops Chicago O'Hare Intl London Heathrow
£727British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
06:30 - 11:35BHD  Belfast City-SEA Seattle/Tacoma Intl
13h 05m1 stop London Heathrow
British Airways Logo
13:30 - 20:35SEA  Seattle/Tacoma Intl-BHD Belfast City
23h 05m1 stop London Heathrow
£739British Airways
Sun, 6 Sep - Sun, 13 Sep
Multiple Airlines Logo
08:45 - 11:45BHD  Belfast City-SEA Seattle/Tacoma Intl
35h 00m2 stops London Gatwick Reykjavik Keflavik Intl
Multiple Airlines Logo
19:00 - 20:30SEA  Seattle/Tacoma Intl-BHD Belfast City
17h 30m2 stops Reykjavik Keflavik Intl London Gatwick
£743Multiple Airlines
Mon, 7 Sep - Fri, 11 Sep
British Airways Logo
06:30 - 11:35BHD  Belfast City-SEA Seattle/Tacoma Intl
13h 05m1 stop London Heathrow
British Airways Logo
13:40 - 18:45SEA  Seattle/Tacoma Intl-BHD Belfast City
21h 05m2 stops Chicago O'Hare Intl London Heathrow
£746British Airways
Sun, 6 Sep - Sun, 13 Sep
British Airways Logo
11:00 - 00:13BHD  Belfast City-SEA Seattle/Tacoma Intl
21h 13m2 stops London Heathrow Chicago O'Hare Intl
British Airways Logo
13:40 - 18:45SEA  Seattle/Tacoma Intl-BHD Belfast City
21h 05m2 stops Chicago O'Hare Intl London Heathrow
£748British Airways
Sun, 6 Sep - Sun, 13 Sep

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British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
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
7 Oct
BHD10:05Belfast City
16h 20m
1 stop
SEA18:25Seattle/Tacoma Intl
11 Oct
SEA06:12Seattle/Tacoma Intl
24h 23m
2 stops
BHD14:35Belfast City
£722
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
£723

KLM flights from Northern Ireland to Seattle

Our best KLM deals on Northern Ireland to Seattle flight tickets
KLM
5 Oct
BHD09:50Belfast City
19h 00m
2 stops
SEA20:50Seattle/Tacoma Intl
8 Oct
SEA13:39Seattle/Tacoma Intl
19h 16m
2 stops
BHD16:55Belfast City
£2,648
KLM
19 Aug
BHD17:30Belfast City
26h 07m
1 stop
SEA11:37Seattle/Tacoma Intl
24 Aug
SEA17:45Seattle/Tacoma Intl
15h 10m
1 stop
BHD16:55Belfast City
£5,870
KLM
19 Aug
BHD17:30Belfast City
26h 07m
1 stop
SEA11:37Seattle/Tacoma Intl
24 Aug
SEA17:45Seattle/Tacoma Intl
15h 10m
1 stop
BHD16:55Belfast City
£5,879

momondo Fare Finder

 
Customise your flight search to find flights from Northern Ireland to Seattle 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 9 August 2026.
Use the filters below to find and compare flights from Northern Ireland to Seattle 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

Wed 7/10

11:35-11:35

1 stop32h 00m

Seattle/Tacoma Intl

Sun 11/10

20:20-20:35

1 stop16h 15m

£721

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 7/10

10:05-18:25

1 stop16h 20m

Seattle/Tacoma Intl

Sun 11/10

06:12-14:35

2 stops24h 23m

£722

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 7/10

11:35-11:35

1 stop32h 00m

Seattle/Tacoma Intl

Sun 11/10

20:20-20:35

1 stop16h 15m

£723

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 7/10

10:05-00:36

2 stops22h 31m

Seattle/Tacoma Intl

Sun 11/10

15:14-17:40

2 stops18h 26m

£725

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 7/10

11:35-00:36

2 stops21h 01m

Seattle/Tacoma Intl

Sun 11/10

06:12-14:35

2 stops24h 23m

£726

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 7/10

10:05-00:36

2 stops22h 31m

Seattle/Tacoma Intl

Sun 11/10

15:14-17:40

2 stops18h 26m

£727

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Sun 6/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 13/9

13:30-20:35

1 stop23h 05m

£739

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 7/9

08:45-11:45

2 stops35h 00m

Seattle/Tacoma Intl

Fri 11/9

19:00-20:30

2 stops17h 30m

£743
Fastest return journey

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Sun 6/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 13/9

13:40-18:45

2 stops21h 05m

£746

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Sun 6/9

11:00-00:13

2 stops21h 13m

Seattle/Tacoma Intl

Sun 13/9

13:40-18:45

2 stops21h 05m

£748

Flights are sorted by cheapest return flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Northern Ireland to Seattle

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 Seattle/Tacoma Intl?

KLM is the most popular carrier operating from Northern Ireland to Seattle/Tacoma Intl

Cheap Northern Ireland to Seattle flight deals and tips

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

Fastest flight time

16h 20m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 16h 20m
There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.
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Frequently asked questions about flying from Northern Ireland to Seattle

  • When did momondo last update prices for flights from Northern Ireland to Seattle/Tacoma Intl Airport?

    Prices for flights from Northern Ireland to Seattle/Tacoma Intl Airport refresh daily.

  • How old do you have to be to fly from Northern Ireland to Seattle/Tacoma Intl Airport?

    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 Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Westport
Kirkland
Ashford
Tacoma
SeaTac
Tukwila
Fife

Why use momondo?

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

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

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

momondo does allow users to show only those flights to Seattle from Northern Ireland which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Northern Ireland and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Northern Ireland to Seattle right now. Can momondo alert me if prices change?

Price alerts on flights to Seattle from Northern Ireland are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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