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Cheap flights from Northern Ireland to Seattle from £348

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 28/4. 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
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.
British Airways Logo
12:25 - 16:55
BHD
-
SEA
12h 30m1 stop
British Airways Logo
14:04 - 14:15
SEA
-
BHD
40h 11m2 stops
£630British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m2 stops
British Airways Logo
14:04 - 14:15
SEA
-
BHD
40h 11m2 stops
£635British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
11:25 - 16:55
BHD
-
SEA
13h 30m1 stop
British Airways Logo
18:50 - 16:50
SEA
-
BHD
14h 00m1 stop
£656British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
12:25 - 16:55
BHD
-
SEA
12h 30m1 stop
British Airways Logo
18:50 - 07:40
SEA
-
BHD
28h 50m1 stop
£663British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m2 stops
British Airways Logo
08:04 - 10:20
SEA
-
BHD
18h 16m2 stops
£665British Airways
Wed, 4 Feb - Sun, 8 Feb

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
28 Jan
BHD12:25Belfast City
12h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
1 Feb
SEA14:04Seattle/Tacoma Intl
40h 11m
2 stops
BHD14:15Belfast City
£630
Find similar
British Airways
28 Jan
BHD06:35Belfast City
38h 39m
2 stops
SEA13:14Seattle/Tacoma Intl
1 Feb
SEA14:04Seattle/Tacoma Intl
40h 11m
2 stops
BHD14:15Belfast City
£631
Find similar
British Airways
28 Jan
BHD06:35Belfast City
23h 32m
2 stops
SEA22:07Seattle/Tacoma Intl
1 Feb
SEA14:04Seattle/Tacoma Intl
40h 11m
2 stops
BHD14:15Belfast City
£635
Find similar

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 16 December 2025.
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

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£630

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£635

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 8/2

18:50-16:50

1 stop14h 00m

£656

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 1/2

18:50-07:40

1 stop28h 50m

£663

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 8/2

08:04-10:20

2 stops18h 16m

£665

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 28/4

07:00-19:41

3 stops20h 41m

£348

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 28/4

09:35-18:25

1 stop16h 50m

£428

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 28/4

10:50-16:59

2 stops38h 09m

£432

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 28/4

13:40-18:25

1 stop12h 45m

£434

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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?

British Airways 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 30m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 13h 30m
There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.
Search flight deals

  • 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
British AirwaysPriceFrom £440Free CancellationRating
6.7
7,575 reviews
Search British Airways flights
American AirlinesPriceFrom £562Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights

Travelling to a place near Seattle?

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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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