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 December 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.

£600 Cheap Flights from Belfast to Seattle in 2025/26

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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.

06:35 - 16:55

BHD

SEA

18h 20m1 stop

14:04 - 14:15

SEA

BHD

40h 11m2 stops

£625British Airways

Wed, 28 Jan - Sun, 1 Feb

06:35 - 13:14

BHD

SEA

38h 39m2 stops

14:04 - 14:15

SEA

BHD

40h 11m2 stops

£629British Airways

Wed, 28 Jan - Sun, 1 Feb

09:15 - 16:55

BHD

SEA

15h 40m1 stop

14:04 - 10:40

SEA

BHD

36h 36m2 stops

£631British Airways

Wed, 28 Jan - Sun, 1 Feb

12:25 - 16:55

BHD

SEA

12h 30m1 stop

18:50 - 16:50

SEA

BHD

14h 00m1 stop

£651British Airways

Wed, 4 Feb - Sun, 8 Feb

11:25 - 16:55

BHD

SEA

13h 30m1 stop

18:50 - 18:40

SEA

BHD

15h 50m1 stop

£654British Airways

Wed, 4 Feb - Sun, 8 Feb

12:25 - 16:55

BHD

SEA

12h 30m1 stop

08:04 - 13:55

SEA

BHD

21h 51m2 stops

£657British Airways

Wed, 4 Feb - Sun, 8 Feb

06:35 - 22:07

BHD

SEA

23h 32m2 stops

08:04 - 13:55

SEA

BHD

21h 51m2 stops

£659British Airways

Wed, 4 Feb - Sun, 8 Feb

06:35 - 22:07

BHD

SEA

23h 32m2 stops

08:04 - 13:55

SEA

BHD

21h 51m2 stops

£663British Airways

Wed, 4 Feb - Sun, 8 Feb

11:30 - 11:30

BHD

SEA

32h 00m1 stop

08:04 - 14:50

SEA

BHD

22h 46m2 stops

£713American Airlines

Fri, 9 Jan - Tue, 13 Jan

18:30 - 18:00

BFS

SEA

30h 30m3 stops

19:00 - 20:15

SEA

BFS

17h 15m3 stops

£778Multiple Airlines

Fri, 27 Mar - Wed, 8 Apr

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

28 Jan

BHD06:35Belfast City

38h 39m

2 stops

SEA13:14Seattle/Tacoma Intl

1 Feb

SEA14:04Seattle/Tacoma Intl

40h 11m

2 stops

BHD14:15Belfast City

£625

Find similar

British Airways

28 Jan

BHD06:35Belfast City

38h 39m

2 stops

SEA13:14Seattle/Tacoma Intl

1 Feb

SEA14:04Seattle/Tacoma Intl

40h 11m

2 stops

BHD14:15Belfast City

£629

Find similar

British Airways

4 Feb

BHD12:25Belfast City

12h 30m

1 stop

SEA16:55Seattle/Tacoma Intl

8 Feb

SEA18:50Seattle/Tacoma Intl

14h 00m

1 stop

BHD16:50Belfast City

£651

Find similar

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

9 Jan

BHD14:50Belfast City

28h 40m

1 stop

SEA11:30Seattle/Tacoma Intl

13 Jan

SEA18:50Seattle/Tacoma Intl

15h 50m

1 stop

BHD18:40Belfast City

£713

Find similar

American Airlines

27 Mar

BHD06:45Belfast City

12h 45m

1 stop

SEA12:30Seattle/Tacoma Intl

8 Apr

SEA13:35Seattle/Tacoma Intl

14h 20m

1 stop

BHD11:55Belfast City

£1,235

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£625

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-13:14

2 stops38h 39m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£629

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

09:15-16:55

1 stop15h 40m

Seattle/Tacoma Intl

Sun 1/2

14:04-10:40

2 stops36h 36m

£631

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 8/2

18:50-16:50

1 stop14h 00m

£651

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 8/2

18:50-18:40

1 stop15h 50m

£654

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£663

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 9/1

11:30-11:30

1 stop32h 00m

Seattle/Tacoma Intl

Tue 13/1

08:04-14:50

2 stops22h 46m

£713

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 27/3

18:30-18:00

3 stops30h 30m

Seattle/Tacoma Intl

Wed 8/4

19:00-20:15

3 stops17h 15m

£778

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

Fastest flight time	12h 30m
Direct flights	None

The fastest flight from Belfast to Seattle takes 12h 30m

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 December 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 £441	Free Cancellation	Rating 6.7 7,562 reviews		Search British Airways flights
American Airlines	PriceFrom £563	Free Cancellation	Rating 7.2 11,047 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

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.