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 August 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.

£554 Cheap Flights from Belfast to Seattle in 2025

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Find the cheapest flights from Belfast to Seattle

Round-trip

One-way

Cheap return flights

06:40 - 11:35BHD-SEA

12h 55m1 stop

13:30 - 18:40SEA-BHD

21h 10m1 stop

£567British Airways

Find Deal

Mon, 15 Sep - Wed, 24 Sep

06:40 - 11:35BHD-SEA

12h 55m1 stop

13:30 - 18:40SEA-BHD

21h 10m1 stop

£568British Airways

Find Deal

Mon, 15 Sep - Wed, 24 Sep

19:30 - 11:10BHD-SEA

23h 40m1 stop

10:11 - 11:55SEA-BHD

17h 44m2 stops

£569British Airways

Find Deal

Mon, 15 Sep - Wed, 24 Sep

06:35 - 11:10BHD-SEA

12h 35m1 stop

13:30 - 10:35SEA-BHD

13h 05m1 stop

£575British Airways

Find Deal

Tue, 9 Sep - Tue, 16 Sep

06:30 - 19:00BHD-SEA

20h 30m2 stops

13:55 - 16:55SEA-BHD

19h 00m1 stop

£576Delta

Find Deal

Tue, 9 Sep - Tue, 16 Sep

19:30 - 20:09BHD-SEA

32h 39m2 stops

10:11 - 11:55SEA-BHD

17h 44m2 stops

£579British Airways

Find Deal

Mon, 15 Sep - Wed, 24 Sep

06:30 - 19:00BHD-SEA

20h 30m2 stops

09:40 - 16:55SEA-BHD

23h 15m2 stops

£580Delta

Find Deal

Tue, 9 Sep - Tue, 16 Sep

19:30 - 11:10BHD-SEA

23h 40m1 stop

10:11 - 11:55SEA-BHD

17h 44m2 stops

£632British Airways

Find Deal

Mon, 15 Sep - Wed, 24 Sep

06:40 - 21:23BHD-SEA

22h 43m2 stops

06:05 - 11:55SEA-BHD

21h 50m2 stops

£732Iberia

Find Deal

Mon, 15 Sep - Wed, 24 Sep

Delta flights from Belfast to Seattle

Our best Delta deals on Belfast to Seattle flight tickets

Delta

9 Sept

BHD06:30Belfast City

20h 30m

2 stops

SEA19:00Seattle/Tacoma Intl

16 Sept

SEA13:55Seattle/Tacoma Intl

19h 00m

1 stop

BHD16:55Belfast City

£576

Find similar

Delta

9 Sept

BHD06:30Belfast City

20h 30m

2 stops

SEA19:00Seattle/Tacoma Intl

16 Sept

SEA09:40Seattle/Tacoma Intl

23h 15m

2 stops

BHD16:55Belfast City

£580

Find similar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

15 Sept

BHD06:40Belfast City

12h 55m

1 stop

SEA11:35Seattle/Tacoma Intl

24 Sept

SEA13:30Seattle/Tacoma Intl

21h 10m

1 stop

BHD18:40Belfast City

£567

Find similar

British Airways

15 Sept

BHD06:40Belfast City

12h 55m

1 stop

SEA11:35Seattle/Tacoma Intl

24 Sept

SEA13:30Seattle/Tacoma Intl

21h 10m

1 stop

BHD18:40Belfast City

£568

Find similar

British Airways

15 Sept

BHD19:30Belfast City

23h 40m

1 stop

SEA11:10Seattle/Tacoma Intl

24 Sept

SEA10:11Seattle/Tacoma Intl

17h 44m

2 stops

BHD11:55Belfast City

£569

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

06:40-11:35

1 stop12h 55m

Seattle/Tacoma Intl

Wed 24/9

13:30-18:40

1 stop21h 10m

£567

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

06:40-11:35

1 stop12h 55m

Seattle/Tacoma Intl

Wed 24/9

13:30-18:40

1 stop21h 10m

£568

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

19:30-11:10

1 stop23h 40m

Seattle/Tacoma Intl

Wed 24/9

10:11-11:55

2 stops17h 44m

£569

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/9

06:35-11:10

1 stop12h 35m

Seattle/Tacoma Intl

Tue 16/9

13:30-10:35

1 stop13h 05m

£575

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/9

06:30-19:00

2 stops20h 30m

Seattle/Tacoma Intl

Tue 16/9

13:55-16:55

1 stop19h 00m

£576

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

19:30-20:09

2 stops32h 39m

Seattle/Tacoma Intl

Wed 24/9

10:11-11:55

2 stops17h 44m

£579

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/9

06:30-19:00

2 stops20h 30m

Seattle/Tacoma Intl

Tue 16/9

09:40-16:55

2 stops23h 15m

£580

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

19:30-11:10

1 stop23h 40m

Seattle/Tacoma Intl

Wed 24/9

10:11-11:55

2 stops17h 44m

£632

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

06:40-21:23

2 stops22h 43m

Seattle/Tacoma Intl

Wed 24/9

06:05-11:55

2 stops21h 50m

£732

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 35m.
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 August 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 £437	Free Cancellation	Rating 6.7 7,291 reviews		Search British Airways flights
American Airlines	PriceFrom £557	Free Cancellation	Rating 7.2 10,000 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.

Kent

SeaTac

Fife

Tukwila

Renton

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.