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Cheap flights from Belfast to Seattle from £313

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Belfast to Seattle departing on 18/5. 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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Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
06:35 - 11:30
BHD
-
SEA
12h 55m
1 stop
British Airways Logo
19:50 - 18:35
SEA
-
BHD
15h 45m
1 stop
£654British Airways
Sat, 7 Mar - Mon, 9 Mar
KLM Logo
06:30 - 18:40
BHD
-
SEA
19h 10m
2 stops
KLM Logo
17:30 - 09:20
SEA
-
BHD
31h 50m
1 stop
£657KLM
Mon, 23 Mar - Mon, 30 Mar
British Airways Logo
06:35 - 23:04
BHD
-
SEA
24h 29m
2 stops
British Airways Logo
07:21 - 14:15
SEA
-
BHD
23h 54m
2 stops
£658British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 23:04
BHD
-
SEA
24h 29m
2 stops
British Airways Logo
07:21 - 10:40
SEA
-
BHD
20h 19m
2 stops
£659British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 11:30
BHD
-
SEA
12h 55m
1 stop
British Airways Logo
07:21 - 14:15
SEA
-
BHD
23h 54m
2 stops
£678British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 23:04
BHD
-
SEA
24h 29m
2 stops
British Airways Logo
13:37 - 18:35
SEA
-
BHD
21h 58m
2 stops
£682British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£688British Airways
Mon, 18 May - Thu, 28 May
KLM Logo
09:50 - 11:42
BHD
-
SEA
33h 52m
1 stop
KLM Logo
09:34 - 09:20
SEA
-
BHD
15h 46m
2 stops
£692KLM
Mon, 18 May - Thu, 28 May
KLM Logo
09:50 - 20:41
BHD
-
SEA
18h 51m
2 stops
KLM Logo
10:40 - 09:20
SEA
-
BHD
14h 40m
2 stops
£701KLM
Mon, 18 May - Thu, 28 May
Multiple Airlines Logo
18:25 - 18:00
BFS
-
SEA
30h 35m
3 stops
Multiple Airlines Logo
15:40 - 15:55
SEA
-
BFS
16h 15m
2 stops
£702Multiple Airlines
Wed, 25 Mar - Wed, 1 Apr

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets
American Airlines
10 Feb
BHD10:00Belfast City
14h 55m
1 stop
SEA16:55Seattle/Tacoma Intl
15 Feb
SEA22:57Seattle/Tacoma Intl
27h 43m
2 stops
BHD10:40Belfast City
£928
American Airlines
10 Feb
BHD06:35Belfast City
23h 32m
2 stops
SEA22:07Seattle/Tacoma Intl
15 Feb
SEA22:57Seattle/Tacoma Intl
27h 43m
2 stops
BHD10:40Belfast City
£946
American Airlines
10 Feb
BHD11:25Belfast City
13h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
14 Feb
SEA22:57Seattle/Tacoma Intl
27h 23m
2 stops
BHD10:20Belfast City
£959

Finnair flights from Belfast to Seattle

Our best Finnair deals on Belfast to Seattle flight tickets
Finnair
10 Feb
BHD11:25Belfast City
13h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
13 Feb
SEA06:44Seattle/Tacoma Intl
23h 31m
2 stops
BHD14:15Belfast City
£1,963
Finnair
10 Feb
BHD11:25Belfast City
42h 22m
2 stops
SEA21:47Seattle/Tacoma Intl
14 Feb
SEA06:44Seattle/Tacoma Intl
23h 31m
2 stops
BHD14:15Belfast City
£2,036
Finnair
10 Feb
BHD11:25Belfast City
13h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
12 Feb
SEA06:44Seattle/Tacoma Intl
23h 16m
2 stops
BHD14:00Belfast City
£2,789

momondo Fare Finder

 
Customise your flight search to find flights from Belfast 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 February 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£654

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 23/3

06:30-18:40

2 stops19h 10m

Seattle/Tacoma Intl

Mon 30/3

17:30-09:20

1 stop31h 50m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

07:21-14:15

2 stops23h 54m

£658

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

07:21-10:40

2 stops20h 19m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Mon 9/3

07:21-14:15

2 stops23h 54m

£678

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

13:37-18:35

2 stops21h 58m

£682

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 18/5

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Thu 28/5

20:20-18:45

1 stop14h 25m

£688

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 18/5

09:50-11:42

1 stop33h 52m

Seattle/Tacoma Intl

Thu 28/5

09:34-09:20

2 stops15h 46m

£692

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 18/5

09:50-20:41

2 stops18h 51m

Seattle/Tacoma Intl

Thu 28/5

10:40-09:20

2 stops14h 40m

£701

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 25/3

18:25-18:00

3 stops30h 35m

Seattle/Tacoma Intl

Wed 1/4

15:40-15:55

2 stops16h 15m

£702

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

See travel insights to Seattle from

How to get the cheapest flight ticket from Belfast 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 Belfast to Seattle/Tacoma Intl?

British Airways is the most popular carrier operating from Belfast to Seattle/Tacoma Intl

Cheap Belfast to Seattle flight deals and tips

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

Fastest flight time

12h 55m

Direct flights

None
The fastest flight from Belfast to Seattle takes 12h 55m
There are no direct flights from Belfast to Seattle. There are no popular flight routes from Belfast to Seattle.
Search flight deals

  • How far is Belfast to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 4463.0 mi away from Belfast. By plane, this route typically takes 12h 55m.

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

    Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Belfast to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Belfast 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 Belfast 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 Belfast to Seattle

Compare and see reviews for airlines that fly from Belfast to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £552Free CancellationRating
7.2
11,258 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
SeaTac
Tukwila

Why use momondo?

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

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

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

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

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

momondo provides multiple filters to help you find the best flight to Seattle from Belfast. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Seattle from Belfast. 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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