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

As of December 2025, there is 1 operator available to choose from for flights from Seattle/Tacoma Intl Airport to Belfast.

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.

$279 Cheap Flights from Seattle to Belfast in 2025/26

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Find the cheapest flights from Seattle to Belfast

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:50 pm - 4:35 pmSEA-BHD

13h 45m1 stop

6:35 am - 5:55 pmBHD-SEA

18h 20m1 stop

$549British Airways

Find Deal

Wed, Feb 25 - Wed, Mar 11

6:50 pm - 6:40 pmSEA-BHD

15h 50m1 stop

7:25 pm - 11:30 amBHD-SEA

24h 05m1 stop

$559British Airways

Find Deal

Sun, Jan 11 - Mon, Jan 26

7:15 am - 10:15 amSEA-BHD

19h 00m2 stops

12:25 pm - 5:55 pmBHD-SEA

12h 30m1 stop

$570British Airways

Find Deal

Wed, Feb 25 - Wed, Mar 11

6:50 pm - 4:50 pmSEA-BHD

14h 00m1 stop

2:40 pm - 5:55 pmBHD-SEA

34h 15m1 stop

$572British Airways

Find Deal

Sun, Feb 22 - Mon, Mar 9

6:50 pm - 4:35 pmSEA-BHD

13h 45m1 stop

6:35 am - 11:33 pmBHD-SEA

23h 58m2 stops

$575British Airways

Find Deal

Wed, Feb 25 - Wed, Mar 11

2:18 pm - 4:35 pmSEA-BHD

18h 17m2 stops

11:25 am - 12:55 amBHD-SEA

20h 30m2 stops

$587British Airways

Find Deal

Wed, Feb 25 - Wed, Mar 11

7:15 am - 10:30 amSEA-BHD

19h 15m2 stops

12:25 pm - 5:55 pmBHD-SEA

12h 30m1 stop

$589British Airways

Find Deal

Tue, Feb 24 - Wed, Mar 11

11:55 am - 6:40 pmSEA-BHD

22h 45m2 stops

7:25 pm - 11:30 amBHD-SEA

24h 05m1 stop

$590British Airways

Find Deal

Sun, Jan 11 - Mon, Jan 26

2:35 pm - 5:55 pmSEA-BFS

19h 20m2 stops

6:30 am - 6:00 pmBFS-SEA

18h 30m2 stops

$640Multiple Airlines

Find Deal

Wed, Feb 25 - Wed, Mar 11

2:35 pm - 10:20 pmSEA-BFS

23h 45m2 stops

6:30 am - 5:00 pmBFS-SEA

18h 30m2 stops

$755Multiple Airlines

Find Deal

Thu, Jan 15 - Thu, Jan 22

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets

British Airways

Feb 25

SEA6:50 pmSeattle/Tacoma Intl

13h 45m

1 stop

BHD4:35 pmBelfast City

Mar 11

BHD6:35 amBelfast City

18h 20m

1 stop

SEA5:55 pmSeattle/Tacoma Intl

$549

Find similar

British Airways

Jan 11

SEA6:50 pmSeattle/Tacoma Intl

15h 50m

1 stop

BHD6:40 pmBelfast City

Jan 26

BHD7:25 pmBelfast City

24h 05m

1 stop

SEA11:30 amSeattle/Tacoma Intl

$559

Find similar

British Airways

Feb 25

SEA7:15 amSeattle/Tacoma Intl

19h 00m

2 stops

BHD10:15 amBelfast City

Mar 11

BHD12:25 pmBelfast City

12h 30m

1 stop

SEA5:55 pmSeattle/Tacoma Intl

$570

Find similar

Aer Lingus flights from Seattle to Belfast

Our best Aer Lingus deals on Seattle to Belfast flight tickets

Aer Lingus

Feb 25

SEA8:05 pmSeattle/Tacoma Intl

34h 20m

2 stops

BHD2:25 pmBelfast City

Mar 10

BHD5:55 pmBelfast City

32h 25m

2 stops

SEA7:20 pmSeattle/Tacoma Intl

$853

Find similar

Aer Lingus

Feb 23

SEA8:05 pmSeattle/Tacoma Intl

15h 50m

2 stops

BHD7:55 pmBelfast City

Mar 13

BHD10:20 amBelfast City

16h 00m

2 stops

SEA7:20 pmSeattle/Tacoma Intl

$854

Find similar

Aer Lingus

Feb 25

SEA8:05 pmSeattle/Tacoma Intl

34h 20m

2 stops

BHD2:25 pmBelfast City

Mar 12

BHD6:00 pmBelfast City

32h 20m

2 stops

SEA7:20 pmSeattle/Tacoma Intl

$855

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/25

6:50 pm-4:35 pm

1 stop13h 45m

Belfast City

Wed 3/11

6:35 am-5:55 pm

1 stop18h 20m

$549

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 1/11

6:50 pm-6:40 pm

1 stop15h 50m

Belfast City

Mon 1/26

7:25 pm-11:30 am

1 stop24h 05m

$559

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/25

7:15 am-10:15 am

2 stops19h 00m

Belfast City

Wed 3/11

12:25 pm-5:55 pm

1 stop12h 30m

$570

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 2/22

6:50 pm-4:50 pm

1 stop14h 00m

Belfast City

Mon 3/9

2:40 pm-5:55 pm

1 stop34h 15m

$572

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/25

6:50 pm-4:35 pm

1 stop13h 45m

Belfast City

Wed 3/11

6:35 am-11:33 pm

2 stops23h 58m

$575

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/25

2:18 pm-4:35 pm

2 stops18h 17m

Belfast City

Wed 3/11

11:25 am-12:55 am

2 stops20h 30m

$587

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 2/24

7:15 am-10:30 am

2 stops19h 15m

Belfast City

Wed 3/11

12:25 pm-5:55 pm

1 stop12h 30m

$589

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 1/11

11:55 am-6:40 pm

2 stops22h 45m

Belfast City

Mon 1/26

7:25 pm-11:30 am

1 stop24h 05m

$590

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 2/25

2:35 pm-5:55 pm

2 stops19h 20m

Belfast Intl

Wed 3/11

6:30 am-6:00 pm

2 stops18h 30m

$640

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 1/15

2:35 pm-10:20 pm

2 stops23h 45m

Belfast Intl

Thu 1/22

6:30 am-5:00 pm

2 stops18h 30m

$755

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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 day to depart on your flight to Belfast?

The cheapest day to depart from Seattle to Belfast is on a Tuesday when prices can be found for as low as $724. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Belfast for around $1,208.

What is the cheapest time of day to depart on your flight to Belfast?

Our data shows that the cheapest Seattle to Belfast flights are usually those with departure times at noon. Our users have found flights to Belfast at noon for as low as $794. Try not to purchase tickets in the afternoon because they tend to be around $1,000. Of course, these prices can vary depending on the time of year and what airport you fly to.

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	13h 35m
Direct flights	None

The fastest flight from Seattle to Belfast takes 13h 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 13h 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 many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Belfast?
As of December 2025, there is 1 operator available to choose from for flights from Seattle/Tacoma Intl Airport to Belfast.
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.

Best airlines flying from Seattle to Belfast

Compare and see reviews for airlines that fly from Seattle to Belfast with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom $737	Free Cancellation	Rating 6.7 7,549 reviews		Search British Airways flights

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.