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.

£317 Cheap Flights from Belfast to Seattle in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Belfast to Seattle

Round-trip

One-way

Cheap return flights

Enter your travel dates to find the best prices.

12:25 - 16:55

BHD

SEA

12h 30m1 stop

07:15 - 10:20

SEA

BHD

20h 05m2 stops

£532British Airways

Wed, 4 Mar - Sun, 8 Mar

06:35 - 16:55

BHD

SEA

18h 20m1 stop

19:50 - 16:50

SEA

BHD

14h 00m1 stop

£533British Airways

Wed, 4 Mar - Sun, 8 Mar

06:35 - 18:20

BHD

SEA

19h 45m2 stops

13:37 - 16:50

SEA

BHD

20h 13m2 stops

£535British Airways

Wed, 4 Mar - Sun, 8 Mar

06:35 - 18:20

BHD

SEA

19h 45m2 stops

13:37 - 13:55

SEA

BHD

17h 18m2 stops

£538British Airways

Wed, 4 Mar - Sun, 8 Mar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

4 Mar

BHD12:25Belfast City

12h 30m

1 stop

SEA16:55Seattle/Tacoma Intl

8 Mar

SEA07:15Seattle/Tacoma Intl

20h 05m

2 stops

BHD10:20Belfast City

£532

Find similar

British Airways

4 Mar

BHD06:35Belfast City

18h 20m

1 stop

SEA16:55Seattle/Tacoma Intl

8 Mar

SEA19:50Seattle/Tacoma Intl

14h 00m

1 stop

BHD16:50Belfast City

£533

Find similar

British Airways

4 Mar

BHD06:35Belfast City

19h 45m

2 stops

SEA18:20Seattle/Tacoma Intl

8 Mar

SEA13:37Seattle/Tacoma Intl

20h 13m

2 stops

BHD16:50Belfast City

£535

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/3

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 8/3

07:15-10:20

2 stops20h 05m

£532

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/3

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/3

19:50-16:50

1 stop14h 00m

£533

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/3

06:35-18:20

2 stops19h 45m

Seattle/Tacoma Intl

Sun 8/3

13:37-16:50

2 stops20h 13m

£535

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/3

06:35-18:20

2 stops19h 45m

Seattle/Tacoma Intl

Sun 8/3

13:37-13:55

2 stops17h 18m

£538

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 5/2

06:30-21:15

2 stops46h 45m

£317

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 5/2

14:45-19:52

3 stops37h 07m

£324

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/2

17:20-15:00

2 stops29h 40m

£1,260

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Belfast to Seattle

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 airline that flies from Belfast to Seattle/Tacoma Intl?

Delta is the most popular carrier operating from Belfast to Seattle/Tacoma Intl

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	18h 20m
Direct flights	None

The fastest flight from Belfast to Seattle takes 18h 20m

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 18h 20m.
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 £438	Free Cancellation	Rating 6.7 7,606 reviews		Search British Airways flights
American Airlines	PriceFrom £559	Free Cancellation	Rating 7.2 11,050 reviews		Search American Airlines flights

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.