How do I get Price Alerts for flights from Belfast to Seattle?

Search flight deals from Belfast to Seattle . While viewing offers you’ll have the option to create a Price Alert.

How can I save money on flights from Belfast to Seattle with momondo?

Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

How does momondo find its flight prices?

We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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?

As of November 2025, there are 2 operators available to choose from 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.

£475 Cheap Flights from Belfast to Seattle in 2025/26

1 adult

0 bags

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Find the cheapest flights from Belfast to Seattle

Round-trip

One-way

Cheap return flights

Enter your travel dates to find the best prices.

09:15 - 13:14BHD-SEA

35h 59m2 stops

14:04 - 16:05SEA-BHD

42h 01m2 stops

£628American Airlines

Find Deal

Wed, 21 Jan - Sun, 25 Jan

06:35 - 13:14BHD-SEA

38h 39m2 stops

14:04 - 14:15SEA-BHD

40h 11m2 stops

£629American Airlines

Find Deal

Wed, 21 Jan - Sun, 25 Jan

06:35 - 13:14BHD-SEA

38h 39m2 stops

14:04 - 16:05SEA-BHD

42h 01m2 stops

£640American Airlines

Find Deal

Wed, 21 Jan - Sun, 25 Jan

09:05 - 11:30BHD-SEA

34h 25m1 stop

08:04 - 14:15SEA-BHD

22h 11m2 stops

£654American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

09:05 - 16:55BHD-SEA

15h 50m1 stop

08:04 - 14:15SEA-BHD

22h 11m2 stops

£655American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

06:35 - 16:55BHD-SEA

18h 20m1 stop

08:04 - 10:20SEA-BHD

18h 16m2 stops

£657British Airways

Find Deal

Wed, 21 Jan - Sun, 25 Jan

11:25 - 16:55BHD-SEA

13h 30m1 stop

08:04 - 10:20SEA-BHD

18h 16m2 stops

£658British Airways

Find Deal

Wed, 21 Jan - Sun, 25 Jan

09:05 - 22:20BHD-SEA

21h 15m2 stops

08:04 - 10:40SEA-BHD

18h 36m2 stops

£659American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

KLM flights from Belfast to Seattle

Our best KLM deals on Belfast to Seattle flight tickets

KLM

21 Dec

BHD17:20Belfast City

26h 30m

1 stop

SEA11:50Seattle/Tacoma Intl

4 Jan

SEA15:10Seattle/Tacoma Intl

17h 40m

1 stop

BHD16:50Belfast City

£1,353

Find similar

KLM

21 Dec

BHD06:30Belfast City

20h 06m

2 stops

SEA18:36Seattle/Tacoma Intl

4 Jan

SEA14:10Seattle/Tacoma Intl

18h 40m

2 stops

BHD16:50Belfast City

£1,362

Find similar

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

21 Jan

BHD09:15Belfast City

35h 59m

2 stops

SEA13:14Seattle/Tacoma Intl

25 Jan

SEA14:04Seattle/Tacoma Intl

42h 01m

2 stops

BHD16:05Belfast City

£628

Find similar

American Airlines

21 Jan

BHD09:15Belfast City

15h 40m

1 stop

SEA16:55Seattle/Tacoma Intl

25 Jan

SEA14:04Seattle/Tacoma Intl

36h 36m

2 stops

BHD10:40Belfast City

£629

Find similar

American Airlines

21 Jan

BHD06:35Belfast City

38h 39m

2 stops

SEA13:14Seattle/Tacoma Intl

25 Jan

SEA14:04Seattle/Tacoma Intl

42h 01m

2 stops

BHD16:05Belfast City

£640

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

09:15-13:14

2 stops35h 59m

Seattle/Tacoma Intl

Sun 25/1

14:04-16:05

2 stops42h 01m

£628

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

06:35-13:14

2 stops38h 39m

Seattle/Tacoma Intl

Sun 25/1

14:04-14:15

2 stops40h 11m

£629

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

06:35-13:14

2 stops38h 39m

Seattle/Tacoma Intl

Sun 25/1

14:04-16:05

2 stops42h 01m

£640

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

09:05-11:30

1 stop34h 25m

Seattle/Tacoma Intl

Mon 2/2

08:04-14:15

2 stops22h 11m

£654

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

09:05-16:55

1 stop15h 50m

Seattle/Tacoma Intl

Mon 2/2

08:04-14:15

2 stops22h 11m

£655

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 25/1

08:04-10:20

2 stops18h 16m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 25/1

08:04-10:20

2 stops18h 16m

£658

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

09:05-22:20

2 stops21h 15m

Seattle/Tacoma Intl

Mon 2/2

08:04-10:40

2 stops18h 36m

£659

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 15/12

06:50-22:26

3 stops47h 36m

£475

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 15/12

08:35-10:37

2 stops34h 02m

£534

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

Cheap Belfast to Seattle flight deals and tips

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

Direct flights	None

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 30m.
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?
As of November 2025, there are 2 operators available to choose from 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
British Airways	PriceFrom £449	Free Cancellation	Rating 6.7 7,535 reviews		Search British Airways flights
American Airlines	PriceFrom £573	Free Cancellation	Rating 7.2 11,043 reviews		Search American Airlines flights

How do I get Price Alerts for flights from Belfast to Seattle?
Search flight deals from Belfast to Seattle. While viewing offers you’ll have the option to create a Price Alert.
How can I save money on flights from Belfast to Seattle with momondo?
Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.
How does momondo find its flight prices?
We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Fife

Renton

SeaTac

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.