How do I get Price Alerts for flights from Belfast to Seattle?

Confirm your travel details to search for the latest offers for flights from Belfast to Seattle . While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

How can I save money on flights from Belfast to Seattle with momondo?

Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore” . Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

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 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.

$760 Cheap Flights from Belfast to Seattle in 2025/26

1 adult

0 bags

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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.

9:05 am - 4:55 pmBHD-SEA

15h 50m1 stop

7:50 pm - 6:35 pmSEA-BHD

15h 45m1 stop

$856American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

10:40 am - 11:30 amBHD-SEA

32h 50m1 stop

7:50 pm - 6:35 pmSEA-BHD

15h 45m1 stop

$860American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

10:40 am - 11:30 amBHD-SEA

32h 50m1 stop

1:48 pm - 2:15 pmSEA-BHD

17h 27m2 stops

$861American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

11:05 am - 11:32 pmBHD-SEA

20h 27m2 stops

1:48 pm - 2:15 pmSEA-BHD

17h 27m2 stops

$862American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

10:40 am - 11:32 pmBHD-SEA

20h 52m2 stops

7:00 am - 2:15 pmSEA-BHD

24h 15m2 stops

$866American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

10:40 am - 11:32 pmBHD-SEA

20h 52m2 stops

7:00 am - 6:35 pmSEA-BHD

28h 35m2 stops

$867American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

8:05 am - 6:20 pmBFS-SEA

18h 15m2 stops

8:05 pm - 10:00 pmSEA-BFS

17h 55m2 stops

$1,552Multiple Airlines

Find Deal

Fri, Dec 19 - Fri, Dec 26

7:05 am - 6:20 pmBFS-SEA

19h 15m2 stops

8:10 am - 10:20 pmSEA-BFS

30h 10m3 stops

$1,634Multiple Airlines

Find Deal

Fri, Dec 19 - Fri, Dec 26

7:00 am - 5:05 pmBFS-SEA

42h 05m2 stops

2:05 pm - 1:50 pmSEA-BFS

15h 45m1 stop

$1,858Multiple Airlines

Find Deal

Fri, Dec 19 - Fri, Dec 26

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

Mar 5

BHD9:05 amBelfast City

15h 50m

1 stop

SEA4:55 pmSeattle/Tacoma Intl

Mar 9

SEA7:50 pmSeattle/Tacoma Intl

15h 45m

1 stop

BHD6:35 pmBelfast City

$856

Find similar

American Airlines

Mar 5

BHD10:40 amBelfast City

32h 50m

1 stop

SEA11:30 amSeattle/Tacoma Intl

Mar 9

SEA7:50 pmSeattle/Tacoma Intl

15h 45m

1 stop

BHD6:35 pmBelfast City

$860

Find similar

American Airlines

Mar 5

BHD10:40 amBelfast City

32h 50m

1 stop

SEA11:30 amSeattle/Tacoma Intl

Mar 9

SEA1:48 pmSeattle/Tacoma Intl

17h 27m

2 stops

BHD2:15 pmBelfast City

$861

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

9:05 am-4:55 pm

1 stop15h 50m

Seattle/Tacoma Intl

Mon 3/9

7:50 pm-6:35 pm

1 stop15h 45m

$856

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

10:40 am-11:30 am

1 stop32h 50m

Seattle/Tacoma Intl

Mon 3/9

7:50 pm-6:35 pm

1 stop15h 45m

$860

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

10:40 am-11:30 am

1 stop32h 50m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$861

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

11:05 am-11:32 pm

2 stops20h 27m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$862

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

10:40 am-11:32 pm

2 stops20h 52m

Seattle/Tacoma Intl

Mon 3/9

7:00 am-2:15 pm

2 stops24h 15m

$866

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

10:40 am-11:32 pm

2 stops20h 52m

Seattle/Tacoma Intl

Mon 3/9

7:00 am-6:35 pm

2 stops28h 35m

$867

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 12/19

8:05 am-6:20 pm

2 stops18h 15m

Seattle/Tacoma Intl

Fri 12/26

8:05 pm-10:00 pm

2 stops17h 55m

$1,552

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 12/19

7:05 am-6:20 pm

2 stops19h 15m

Seattle/Tacoma Intl

Fri 12/26

8:10 am-10:20 pm

3 stops30h 10m

$1,634

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 12/19

7:00 am-5:05 pm

2 stops42h 05m

Seattle/Tacoma Intl

Fri 12/26

2:05 pm-1:50 pm

1 stop15h 45m

$1,858

Flights are sorted by cheapest round-trip 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.

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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 15h 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 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.

How do I get Price Alerts for flights from Belfast to Seattle?
Confirm your travel details to search for the latest offers for flights from Belfast to Seattle. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.
How can I save money on flights from Belfast to Seattle with momondo?
Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.
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.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Redmond

Tukwila

Lakewood

Federal Way

Fife

Cle Elum

Centralia

Kirkland

Westport

Shoreline

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.