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Cheap flights from Seattle to Belfast from $255

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Belfast departing on 5/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Seattle to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
1:35 pm - 11:10 am
SEA
-
BHD
13h 35m
1 stop
British Airways Logo
8:45 am - 5:55 pm
BHD
-
SEA
16h 10m
1 stop
$597British Airways
sáb., mar. 7 - mar., mar. 17
British Airways Logo
6:50 pm - 4:45 pm
SEA
-
BHD
13h 55m
1 stop
British Airways Logo
6:35 am - 5:55 pm
BHD
-
SEA
18h 20m
1 stop
$598British Airways
sáb., mar. 7 - mar., mar. 17
British Airways Logo
6:50 pm - 4:45 pm
SEA
-
BHD
13h 55m
1 stop
British Airways Logo
8:45 am - 12:24 am
BHD
-
SEA
22h 39m
2 stops
$601British Airways
sáb., mar. 7 - mar., mar. 17
British Airways Logo
1:35 pm - 2:25 pm
SEA
-
BHD
16h 50m
2 stops
British Airways Logo
6:35 am - 11:04 pm
BHD
-
SEA
23h 29m
2 stops
$645British Airways
sáb., mar. 7 - mié., mar. 18
British Airways Logo
1:35 pm - 4:20 pm
SEA
-
BHD
18h 45m
2 stops
British Airways Logo
11:25 am - 12:24 am
BHD
-
SEA
19h 59m
2 stops
$648British Airways
sáb., mar. 7 - mar., mar. 17
British Airways Logo
1:35 pm - 10:10 am
SEA
-
BHD
12h 35m
1 stop
British Airways Logo
8:25 pm - 11:35 am
BHD
-
SEA
23h 10m
1 stop
$1,011British Airways
jue., jun. 18 - mar., jun. 23
British Airways Logo
1:35 pm - 10:10 am
SEA
-
BHD
12h 35m
1 stop
British Airways Logo
8:25 pm - 11:35 am
BHD
-
SEA
23h 10m
1 stop
$1,012British Airways
jue., jun. 18 - mar., jun. 23
British Airways Logo
7:50 pm - 6:35 pm
SEA
-
BHD
15h 45m
1 stop
British Airways Logo
8:45 am - 12:24 am
BHD
-
SEA
22h 39m
2 stops
$1,024British Airways
lun., mar. 23 - vie., mar. 27
British Airways Logo
10:27 am - 3:30 pm
SEA
-
BHD
21h 03m
2 stops
British Airways Logo
7:30 pm - 11:35 am
BHD
-
SEA
24h 05m
1 stop
$1,031British Airways
jue., jun. 18 - mar., jun. 23
British Airways Logo
1:37 pm - 2:15 pm
SEA
-
BHD
17h 38m
2 stops
British Airways Logo
8:45 am - 9:16 pm
BHD
-
SEA
19h 31m
2 stops
$1,049British Airways
lun., mar. 23 - vie., mar. 27

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
Mar 7
SEA6:50 pmSeattle/Tacoma Intl
16h 50m
1 stop
BHD7:40 pmBelfast City
Mar 18
BHD11:25 amBelfast City
13h 30m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$597
British Airways
Mar 7
SEA1:35 pmSeattle/Tacoma Intl
16h 40m
1 stop
BHD2:15 pmBelfast City
Mar 18
BHD11:25 amBelfast City
13h 30m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$598
British Airways
Mar 7
SEA6:50 pmSeattle/Tacoma Intl
13h 55m
1 stop
BHD4:45 pmBelfast City
Mar 17
BHD8:45 amBelfast City
22h 39m
2 stops
SEA12:24 amSeattle/Tacoma Intl
$601

Aer Lingus flights from Seattle to Belfast

Our best Aer Lingus deals on Seattle to Belfast flight tickets
Aer Lingus
Mar 15
SEA9:05 pmSeattle/Tacoma Intl
16h 05m
2 stops
BHD8:10 pmBelfast City
Mar 26
BHD6:45 amBelfast City
24h 39m
2 stops
SEA12:24 amSeattle/Tacoma Intl
$4,304
Aer Lingus
Jul 15
SEA8:20 pmSeattle/Tacoma Intl
16h 15m
1 stop
BHD8:35 pmBelfast City
Jul 18
BHD7:15 amBelfast City
17h 55m
2 stops
SEA5:10 pmSeattle/Tacoma Intl
$5,942
Aer Lingus
Jul 15
SEA8:20 pmSeattle/Tacoma Intl
16h 15m
1 stop
BHD8:35 pmBelfast City
Jul 18
BHD3:00 pmBelfast City
34h 10m
2 stops
SEA5:10 pmSeattle/Tacoma Intl
$6,165

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Belfast 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 832,500 searches. Data last updated enero 20, 2026.
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb. 3/7

1:35 pm-11:10 am

1 stop13h 35m

Belfast City

mar. 3/17

8:45 am-5:55 pm

1 stop16h 10m

$597

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb. 3/7

6:50 pm-4:45 pm

1 stop13h 55m

Belfast City

mar. 3/17

6:35 am-5:55 pm

1 stop18h 20m

$598

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb. 3/7

6:50 pm-4:45 pm

1 stop13h 55m

Belfast City

mar. 3/17

8:45 am-12:24 am

2 stops22h 39m

$601

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb. 3/7

1:35 pm-2:25 pm

2 stops16h 50m

Belfast City

mié. 3/18

6:35 am-11:04 pm

2 stops23h 29m

$645

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb. 3/7

1:35 pm-4:20 pm

2 stops18h 45m

Belfast City

mar. 3/17

11:25 am-12:24 am

2 stops19h 59m

$648

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

jue. 6/18

1:35 pm-10:10 am

1 stop12h 35m

Belfast City

mar. 6/23

8:25 pm-11:35 am

1 stop23h 10m

$1,011

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

jue. 6/18

1:35 pm-10:10 am

1 stop12h 35m

Belfast City

mar. 6/23

8:25 pm-11:35 am

1 stop23h 10m

$1,012

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

lun. 3/23

7:50 pm-6:35 pm

1 stop15h 45m

Belfast City

vie. 3/27

8:45 am-12:24 am

2 stops22h 39m

$1,024

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

jue. 6/18

10:27 am-3:30 pm

2 stops21h 03m

Belfast City

mar. 6/23

7:30 pm-11:35 am

1 stop24h 05m

$1,031

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

lun. 3/23

1:37 pm-2:15 pm

2 stops17h 38m

Belfast City

vie. 3/27

8:45 am-9:16 pm

2 stops19h 31m

$1,049

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
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See travel insights to Belfast from

How to get the cheapest flight ticket from Seattle to Belfast

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 Seattle/Tacoma Intl to Belfast?

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

Cheap Seattle to Belfast flight deals and tips

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

Fastest flight time

12h 35m

Direct flights

None
The fastest flight from Seattle to Belfast takes 12h 35m
There are no direct flights from Seattle to Belfast. There are no popular flight routes from Seattle to Belfast.
Search flight deals

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

    Belfast is 4463.0 mi away from Seattle/Tacoma Intl. In terms of flight time, this usually takes a little over 12h 35m.

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

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Belfast.

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

    The travel and health documents required for your trip to Belfast 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 Belfast. 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 Seattle to Belfast?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Belfast. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Belfast from Seattle with this policy.

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

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

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

Yes. momondo can track prices for Seattle to Belfast flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport