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.

£653 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.

11:05 - 16:55BHD-SEA

13h 50m1 stop

07:00 - 14:15SEA-BHD

24h 15m2 stops

£653American Airlines

Find Deal

Thu, 5 Mar - Mon, 9 Mar

10:40 - 11:30BHD-SEA

32h 50m1 stop

19:50 - 18:35SEA-BHD

15h 45m1 stop

£655American Airlines

Find Deal

Thu, 5 Mar - Mon, 9 Mar

17:45 - 16:55BHD-SEA

31h 10m1 stop

19:50 - 18:35SEA-BHD

15h 45m1 stop

£656British Airways

Find Deal

Thu, 5 Mar - Mon, 9 Mar

15:05 - 23:32BHD-SEA

40h 27m2 stops

13:48 - 14:15SEA-BHD

17h 27m2 stops

£657American Airlines

Find Deal

Thu, 5 Mar - Mon, 9 Mar

17:45 - 11:30BHD-SEA

25h 45m1 stop

19:50 - 18:35SEA-BHD

15h 45m1 stop

£658British Airways

Find Deal

Thu, 5 Mar - Mon, 9 Mar

09:05 - 23:32BHD-SEA

22h 27m2 stops

07:00 - 14:15SEA-BHD

24h 15m2 stops

£659American Airlines

Find Deal

Thu, 5 Mar - Mon, 9 Mar

06:35 - 23:32BHD-SEA

24h 57m2 stops

07:00 - 14:15SEA-BHD

24h 15m2 stops

£660American Airlines

Find Deal

Thu, 5 Mar - Mon, 9 Mar

06:35 - 16:55BHD-SEA

18h 20m1 stop

13:28 - 19:10SEA-BHD

21h 42m2 stops

£744British Airways

Find Deal

Wed, 10 Dec - Wed, 17 Dec

06:40 - 18:20BHD-SEA

19h 40m2 stops

20:05 - 18:25SEA-BHD

14h 20m2 stops

£762Aer Lingus

Find Deal

Wed, 10 Dec - Wed, 17 Dec

06:35 - 16:55BHD-SEA

18h 20m1 stop

18:50 - 19:10SEA-BHD

16h 20m1 stop

£1,017British Airways

Find Deal

Wed, 10 Dec - Wed, 17 Dec

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

5 Mar

BHD17:45Belfast City

31h 10m

1 stop

SEA16:55Seattle/Tacoma Intl

9 Mar

SEA19:50Seattle/Tacoma Intl

15h 45m

1 stop

BHD18:35Belfast City

£656

Find similar

British Airways

5 Mar

BHD17:45Belfast City

25h 45m

1 stop

SEA11:30Seattle/Tacoma Intl

9 Mar

SEA19:50Seattle/Tacoma Intl

15h 45m

1 stop

BHD18:35Belfast City

£658

Find similar

British Airways

10 Dec

BHD06:35Belfast City

18h 20m

1 stop

SEA16:55Seattle/Tacoma Intl

17 Dec

SEA13:28Seattle/Tacoma Intl

21h 42m

2 stops

BHD19:10Belfast City

£744

Find similar

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

5 Mar

BHD11:05Belfast City

13h 50m

1 stop

SEA16:55Seattle/Tacoma Intl

9 Mar

SEA07:00Seattle/Tacoma Intl

24h 15m

2 stops

BHD14:15Belfast City

£653

Find similar

American Airlines

5 Mar

BHD10:40Belfast City

32h 50m

1 stop

SEA11:30Seattle/Tacoma Intl

9 Mar

SEA19:50Seattle/Tacoma Intl

15h 45m

1 stop

BHD18:35Belfast City

£655

Find similar

American Airlines

5 Mar

BHD15:05Belfast City

40h 27m

2 stops

SEA23:32Seattle/Tacoma Intl

9 Mar

SEA13:48Seattle/Tacoma Intl

17h 27m

2 stops

BHD14:15Belfast City

£657

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

11:05-16:55

1 stop13h 50m

Seattle/Tacoma Intl

Mon 9/3

07:00-14:15

2 stops24h 15m

£653

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

10:40-11:30

1 stop32h 50m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£655

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

17:45-16:55

1 stop31h 10m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£656

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

15:05-23:32

2 stops40h 27m

Seattle/Tacoma Intl

Mon 9/3

13:48-14:15

2 stops17h 27m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

17:45-11:30

1 stop25h 45m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£658

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

09:05-23:32

2 stops22h 27m

Seattle/Tacoma Intl

Mon 9/3

07:00-14:15

2 stops24h 15m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

06:35-23:32

2 stops24h 57m

Seattle/Tacoma Intl

Mon 9/3

07:00-14:15

2 stops24h 15m

£660

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 10/12

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Wed 17/12

13:28-19:10

2 stops21h 42m

£744

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 10/12

06:40-18:20

2 stops19h 40m

Seattle/Tacoma Intl

Wed 17/12

20:05-18:25

2 stops14h 20m

£762

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 10/12

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Wed 17/12

18:50-19:10

1 stop16h 20m

£1,017

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 13h 50m.
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 £447	Free Cancellation	Rating 6.7 7,521 reviews		Search British Airways flights
American Airlines	PriceFrom £571	Free Cancellation	Rating 7.2 11,051 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.