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 updated daily.

How old do you have to be to fly from Belfast to Seattle/Tacoma Intl Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Belfast to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$923 Cheap Flights from Belfast to Seattle in 2026

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize 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 round-trip flights

Enter your travel dates to find the best prices.

6:35 am - 11:30 am

BHD

SEA

12h 55m

1 stop

7:50 pm - 6:35 pm

SEA

BHD

15h 45m

1 stop

$923British Airways

Sat, Mar 7 - Mon, Mar 9

6:35 am - 11:30 am

BHD

SEA

12h 55m

1 stop

7:21 am - 2:15 pm

SEA

BHD

23h 54m

2 stops

$925British Airways

Sat, Mar 7 - Mon, Mar 9

6:35 am - 11:30 am

BHD

SEA

12h 55m

1 stop

7:50 pm - 6:35 pm

SEA

BHD

15h 45m

1 stop

$927British Airways

Sat, Mar 7 - Mon, Mar 9

6:35 am - 11:04 pm

BHD

SEA

24h 29m

2 stops

1:37 pm - 6:35 pm

SEA

BHD

21h 58m

2 stops

$929British Airways

Sat, Mar 7 - Mon, Mar 9

6:35 am - 11:04 pm

BHD

SEA

24h 29m

2 stops

7:21 am - 6:35 pm

SEA

BHD

28h 14m

2 stops

$931British Airways

Sat, Mar 7 - Mon, Mar 9

6:35 am - 11:04 pm

BHD

SEA

24h 29m

2 stops

1:37 pm - 2:15 pm

SEA

BHD

17h 38m

2 stops

$932British Airways

Sat, Mar 7 - Mon, Mar 9

6:25 pm - 6:00 pm

BFS

SEA

30h 35m

3 stops

3:40 pm - 3:55 pm

SEA

BFS

16h 15m

2 stops

$956Multiple Airlines

Wed, Mar 25 - Wed, Apr 1

9:05 pm - 6:00 pm

BFS

SEA

27h 55m

2 stops

3:40 pm - 3:20 pm

SEA

BFS

15h 40m

2 stops

$1,001Multiple Airlines

Wed, Mar 25 - Wed, Apr 1

6:25 pm - 6:00 pm

BFS

SEA

30h 35m

3 stops

7:00 pm - 11:10 pm

SEA

BFS

20h 10m

3 stops

$1,038Multiple Airlines

Wed, Mar 25 - Wed, Apr 1

8:55 am - 4:00 pm

BFS

SEA

39h 05m

3 stops

11:15 am - 6:55 pm

SEA

BFS

23h 40m

2 stops

$1,172Multiple Airlines

Mon, May 18 - Thu, May 28

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

Mar 7

BHD6:35 amBelfast City

12h 55m

1 stop

SEA11:30 amSeattle/Tacoma Intl

Mar 9

SEA7:50 pmSeattle/Tacoma Intl

15h 45m

1 stop

BHD6:35 pmBelfast City

$923

British Airways

Mar 7

BHD6:35 amBelfast City

12h 55m

1 stop

SEA11:30 amSeattle/Tacoma Intl

Mar 9

SEA7:21 amSeattle/Tacoma Intl

23h 54m

2 stops

BHD2:15 pmBelfast City

$925

British Airways

Mar 7

BHD6:35 amBelfast City

12h 55m

1 stop

SEA11:30 amSeattle/Tacoma Intl

Mar 9

SEA7:50 pmSeattle/Tacoma Intl

15h 45m

1 stop

BHD6:35 pmBelfast City

$927

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 3/7

6:35 am-11:30 am

1 stop12h 55m

Seattle/Tacoma Intl

Mon 3/9

7:50 pm-6:35 pm

1 stop15h 45m

$923

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 3/7

6:35 am-11:30 am

1 stop12h 55m

Seattle/Tacoma Intl

Mon 3/9

7:21 am-2:15 pm

2 stops23h 54m

$925

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 3/7

6:35 am-11:30 am

1 stop12h 55m

Seattle/Tacoma Intl

Mon 3/9

7:50 pm-6:35 pm

1 stop15h 45m

$927

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 3/7

6:35 am-11:04 pm

2 stops24h 29m

Seattle/Tacoma Intl

Mon 3/9

1:37 pm-6:35 pm

2 stops21h 58m

$929

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 3/7

6:35 am-11:04 pm

2 stops24h 29m

Seattle/Tacoma Intl

Mon 3/9

7:21 am-6:35 pm

2 stops28h 14m

$931

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 3/7

6:35 am-11:04 pm

2 stops24h 29m

Seattle/Tacoma Intl

Mon 3/9

1:37 pm-2:15 pm

2 stops17h 38m

$932

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 3/25

6:25 pm-6:00 pm

3 stops30h 35m

Seattle/Tacoma Intl

Wed 4/1

3:40 pm-3:55 pm

2 stops16h 15m

$956

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 3/25

9:05 pm-6:00 pm

2 stops27h 55m

Seattle/Tacoma Intl

Wed 4/1

3:40 pm-3:20 pm

2 stops15h 40m

$1,001

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 3/25

6:25 pm-6:00 pm

3 stops30h 35m

Seattle/Tacoma Intl

Wed 4/1

7:00 pm-11:10 pm

3 stops20h 10m

$1,038

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/18

8:55 am-4:00 pm

3 stops39h 05m

Seattle/Tacoma Intl

Thu 5/28

11:15 am-6:55 pm

2 stops23h 40m

$1,172

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted 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?

British Airways 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	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?
The straight-line distance from Belfast to Seattle/Tacoma Intl is 4463.0 mi. A reasonable flight in good conditions will take 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 updated daily.
How old do you have to be to fly from Belfast to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Belfast to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Redmond

Puyallup

Cle Elum

Lakewood

Tukwila

Federal Way

Kirkland

Westport

Centralia

Fife

Tumwater

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?

All flight searches from Belfast to Seattle on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Belfast to Seattle?

Once all potential Belfast to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Belfast to Seattle right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Belfast to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.