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.

$723 Cheap Flights from Belfast to Seattle in 2025/26

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0 bags

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Find the cheapest flights from Belfast to Seattle

Round-trip

One-way

Cheap round-trip flights

6:45 am - 5:00 pmBHD-SEA

18h 15m2 stops

2:35 pm - 4:45 pmSEA-BHD

18h 10m2 stops

$723Multiple Airlines

Find Deal

Fri, Feb 13 - Tue, Feb 17

11:30 am - 4:55 pmBHD-SEA

13h 25m1 stop

6:50 pm - 6:40 pmSEA-BHD

15h 50m1 stop

$741British Airways

Find Deal

Fri, Feb 13 - Tue, Feb 17

11:30 am - 11:07 pmBHD-SEA

19h 37m2 stops

1:25 pm - 11:30 amSEA-BHD

14h 05m1 stop

$747British Airways

Find Deal

Fri, Feb 13 - Tue, Feb 17

3:05 pm - 11:30 amBHD-SEA

28h 25m1 stop

1:48 pm - 2:15 pmSEA-BHD

17h 27m2 stops

$753American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

6:35 am - 4:55 pmBHD-SEA

18h 20m1 stop

1:48 pm - 6:35 pmSEA-BHD

21h 47m2 stops

$754American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

11:05 am - 4:55 pmBHD-SEA

13h 50m1 stop

1:48 pm - 2:15 pmSEA-BHD

17h 27m2 stops

$757American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

9:05 am - 11:07 pmBHD-SEA

22h 02m2 stops

1:48 pm - 2:15 pmSEA-BHD

17h 27m2 stops

$758American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

10:40 am - 11:07 pmBHD-SEA

20h 27m2 stops

11:59 pm - 2:50 pmSEA-BHD

31h 51m2 stops

$760American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

6:35 am - 11:07 pmBHD-SEA

24h 32m2 stops

1:48 pm - 2:15 pmSEA-BHD

17h 27m2 stops

$762American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

7:05 am - 12:59 pmBHD-SEA

37h 54m3 stops

8:40 am - 12:40 pmSEA-BHD

20h 00m2 stops

$1,071Multiple Airlines

Find Deal

Mon, Oct 6 - Wed, Oct 8

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

Mar 5

BHD3:05 pmBelfast City

28h 25m

1 stop

SEA11:30 amSeattle/Tacoma Intl

Mar 9

SEA1:48 pmSeattle/Tacoma Intl

17h 27m

2 stops

BHD2:15 pmBelfast City

$753

Find similar

American Airlines

Mar 5

BHD6:35 amBelfast City

18h 20m

1 stop

SEA4:55 pmSeattle/Tacoma Intl

Mar 9

SEA1:48 pmSeattle/Tacoma Intl

21h 47m

2 stops

BHD6:35 pmBelfast City

$754

Find similar

American Airlines

Mar 5

BHD6:35 amBelfast City

18h 20m

1 stop

SEA4:55 pmSeattle/Tacoma Intl

Mar 9

SEA7:50 pmSeattle/Tacoma Intl

15h 45m

1 stop

BHD6:35 pmBelfast City

$757

Find similar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

Feb 13

BHD11:30 amBelfast City

13h 25m

1 stop

SEA4:55 pmSeattle/Tacoma Intl

Feb 17

SEA6:50 pmSeattle/Tacoma Intl

15h 50m

1 stop

BHD6:40 pmBelfast City

$741

Find similar

British Airways

Feb 13

BHD11:30 amBelfast City

19h 37m

2 stops

SEA11:07 pmSeattle/Tacoma Intl

Feb 17

SEA1:25 pmSeattle/Tacoma Intl

14h 05m

1 stop

BHD11:30 amBelfast City

$747

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 2/13

6:45 am-5:00 pm

2 stops18h 15m

Seattle/Tacoma Intl

Tue 2/17

2:35 pm-4:45 pm

2 stops18h 10m

$723

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 2/13

11:30 am-4:55 pm

1 stop13h 25m

Seattle/Tacoma Intl

Tue 2/17

6:50 pm-6:40 pm

1 stop15h 50m

$741

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 2/13

11:30 am-11:07 pm

2 stops19h 37m

Seattle/Tacoma Intl

Tue 2/17

1:25 pm-11:30 am

1 stop14h 05m

$747

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

3:05 pm-11:30 am

1 stop28h 25m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$753

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

6:35 am-4:55 pm

1 stop18h 20m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-6:35 pm

2 stops21h 47m

$754

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

11:05 am-4:55 pm

1 stop13h 50m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$757

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

9:05 am-11:07 pm

2 stops22h 02m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$758

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

10:40 am-11:07 pm

2 stops20h 27m

Seattle/Tacoma Intl

Mon 3/9

11:59 pm-2:50 pm

2 stops31h 51m

$760

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/5

6:35 am-11:07 pm

2 stops24h 32m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$762

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 10/6

7:05 am-12:59 pm

3 stops37h 54m

Seattle/Tacoma Intl

Wed 10/8

8:40 am-12:40 pm

2 stops20h 00m

$1,071

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.

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 55m.
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.

Leavenworth

Tacoma

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Federal Way

Kirkland

Tukwila

Shoreline

Lakewood

Centralia

Fife

Cle Elum

Redmond

Westport

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.