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Cheap flights from Northern Ireland to Seattle from £506

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 8/7. 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

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Find the cheapest flights from Northern Ireland to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
08:20 - 21:00
BFS
-
SEA
44h 40m
3 stops
Multiple Airlines Logo
15:40 - 22:20
SEA
-
BFS
22h 40m
3 stops
£651Multiple Airlines
Thu, 16 Jul - Wed, 22 Jul
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£656British Airways
Thu, 10 Sep - Thu, 1 Oct
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
13:38 - 15:30
SEA
-
BHD
17h 52m
2 stops
£680British Airways
Thu, 10 Sep - Thu, 1 Oct
KLM Logo
09:50 - 23:20
BHD
-
SEA
21h 30m
2 stops
KLM Logo
20:59 - 16:55
SEA
-
BHD
35h 56m
2 stops
£698KLM
Thu, 10 Sep - Thu, 1 Oct
Delta Logo
09:50 - 23:55
BHD
-
SEA
22h 05m
2 stops
Delta Logo
07:15 - 09:20
SEA
-
BHD
18h 05m
2 stops
£702Delta
Thu, 10 Sep - Thu, 1 Oct
British Airways Logo
20:35 - 18:25
BHD
-
SEA
29h 50m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£710British Airways
Thu, 24 Sep - Sun, 27 Sep
British Airways Logo
20:35 - 18:25
BHD
-
SEA
29h 50m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£710British Airways
Thu, 24 Sep - Sun, 27 Sep
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
19:00 - 23:05
SEA
-
BFS
20h 05m
2 stops
£712Multiple Airlines
Thu, 10 Sep - Thu, 1 Oct
British Airways Logo
20:35 - 18:25
BHD
-
SEA
29h 50m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£712British Airways
Thu, 24 Sep - Sun, 27 Sep
British Airways Logo
19:30 - 21:36
BHD
-
SEA
34h 06m
2 stops
British Airways Logo
10:59 - 18:45
SEA
-
BHD
23h 46m
2 stops
£714British Airways
Thu, 24 Sep - Sun, 27 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
10 Sept
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
1 Oct
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£656
British Airways
10 Sept
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
1 Oct
SEA13:38Seattle/Tacoma Intl
17h 52m
2 stops
BHD15:30Belfast City
£680
British Airways
24 Sept
BHD20:35Belfast City
29h 50m
1 stop
SEA18:25Seattle/Tacoma Intl
27 Sept
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£710

KLM flights from Northern Ireland to Seattle

Our best KLM deals on Northern Ireland to Seattle flight tickets
KLM
10 Sept
BHD09:50Belfast City
21h 30m
2 stops
SEA23:20Seattle/Tacoma Intl
1 Oct
SEA20:59Seattle/Tacoma Intl
35h 56m
2 stops
BHD16:55Belfast City
£698
KLM
19 Jul
BHD17:30Belfast City
26h 03m
1 stop
SEA11:33Seattle/Tacoma Intl
27 Jul
SEA09:30Seattle/Tacoma Intl
15h 50m
2 stops
BHD09:20Belfast City
£779

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 30 June 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

BFS - SEA

BFSSEA

Belfast Intl

Thu 16/7

08:20-21:00

3 stops44h 40m

Seattle/Tacoma Intl

Wed 22/7

15:40-22:20

3 stops22h 40m

£651
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Thu 1/10

20:20-18:45

1 stop14h 25m

£656

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Thu 1/10

13:38-15:30

2 stops17h 52m

£680

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/9

09:50-23:20

2 stops21h 30m

Seattle/Tacoma Intl

Thu 1/10

20:59-16:55

2 stops35h 56m

£698

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/9

09:50-23:55

2 stops22h 05m

Seattle/Tacoma Intl

Thu 1/10

07:15-09:20

2 stops18h 05m

£702

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 24/9

20:35-18:25

1 stop29h 50m

Seattle/Tacoma Intl

Sun 27/9

20:20-18:45

1 stop14h 25m

£710

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 24/9

20:35-18:25

1 stop29h 50m

Seattle/Tacoma Intl

Sun 27/9

20:20-18:45

1 stop14h 25m

£710

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 10/9

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Thu 1/10

19:00-23:05

2 stops20h 05m

£712

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 24/9

20:35-18:25

1 stop29h 50m

Seattle/Tacoma Intl

Sun 27/9

20:20-18:45

1 stop14h 25m

£712

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 24/9

19:30-21:36

2 stops34h 06m

Seattle/Tacoma Intl

Sun 27/9

10:59-18:45

2 stops23h 46m

£714

Flights are sorted by cheapest return flights first.

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

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?

Aer Lingus 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

13h 50m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 13h 50m
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 many operators does momondo search for flights from Northern Ireland to Seattle/Tacoma Intl Airport?

  • 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.

Best airlines flying from Northern Ireland to Seattle

Compare and see reviews for airlines that fly from Northern Ireland to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £568Free CancellationRating
7.1
11,762 reviews
Search American Airlines flights

Travelling to a place near Seattle?

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

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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