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$251+ Cheap flights from Seattle (SEA) to Belfast

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap flight deals from Seattle to Belfast

Cheapest flights from Seattle to Belfast
Explore the most affordable flight options available from Seattle to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.

This oojo deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:50 pm
SEA
-
BHD
1 stop16h 50m
British Airways
Tue 3/176:35 am
BHD
-
SEA
1 stop18h 20m
British Airways
Deal found 2/8$626
This oojo deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:50 pm
SEA
-
BHD
1 stop16h 50m
British Airways
Wed 3/189:15 am
BHD
-
SEA
2 stops20h 49m
British Airways
Deal found 2/8$682
This FlightHub deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/285:30 am
SEA
-
BHD
2 stops28h 45m
British Airways
Mon 4/66:30 am
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 2/8$767
This Air France deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/285:30 pm
SEA
-
BHD
1 stop15h 25m
Multiple Airlines
Mon 4/69:50 am
BHD
-
SEA
1 stop33h 55m
Multiple Airlines
Deal found 2/8$768
This Cheapflightsfares deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/268:20 pm
SEA
-
BHD
1 stop15h 20m
British Airways
Wed 6/36:30 am
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 2/10$803
This Mytrip deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/93:35 pm
SEA
-
BFS
2 stops21h 40m
Multiple Airlines
Sun 3/155:45 am
BFS
-
SEA
3 stops41h 55m
Multiple Airlines
Deal found 2/10$808
This Mytrip deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/263:35 pm
SEA
-
BFS
2 stops21h 50m
Multiple Airlines
Thu 4/210:20 am
BFS
-
SEA
2 stops18h 20m
Multiple Airlines
Deal found 2/9$849
This oojo deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/35:30 am
SEA
-
BHD
2 stops26h 00m
British Airways
Sun 4/127:10 pm
BHD
-
SEA
1 stop24h 25m
British Airways
Deal found 2/7$855
This Mytrip deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/213:40 pm
SEA
-
BFS
2 stops19h 50m
Multiple Airlines
Tue 5/268:20 am
BFS
-
SEA
2 stops20h 20m
Multiple Airlines
Deal found 2/9$1,036
This Mytrip deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:50 pm
SEA
-
BFS
2 stops20h 10m
Multiple Airlines
Wed 6/36:00 am
BFS
-
SEA
3 stops22h 40m
Multiple Airlines
Deal found 2/10$1,090
This Mytrip deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:00 am
SEA
-
BFS
3 stops29h 15m
Multiple Airlines
Sun 4/129:05 pm
BFS
-
SEA
3 stops30h 13m
Multiple Airlines
Deal found 2/7$1,094
This Trip.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/287:00 pm
SEA
-
BFS
2 stops17h 50m
Multiple Airlines
Mon 4/66:40 am
BFS
-
SEA
2 stops19h 15m
Multiple Airlines
Deal found 2/8$1,116

Find flight deals from Seattle to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Belfast (BF1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 11, 2026.

Round-trip from

$626
(oojo)

One-way from

$251
(Delta)
From Seattle/Tacoma Intl to Belfast
Search Deals
One-way flight from Seattle/Tacoma Intl to Belfast
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Belfast that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.

Fly from

Seattle

Fly to

Belfast

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Tue 3/17

6:35 am-5:55 pm

1 stop18h 20m

$626

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Wed 3/18

9:15 am-5:55 pm

1 stop15h 40m

$626

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/28

5:30 am-5:15 pm

2 stops28h 45m

Belfast City

Mon 4/6

6:30 am-11:35 am

1 stop13h 05m

$767

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/28

5:30 pm-3:55 pm

1 stop15h 25m

Belfast City

Mon 4/6

9:50 am-11:45 am

1 stop33h 55m

$768

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 5/26

8:20 pm-7:40 pm

1 stop15h 20m

Belfast City

Wed 6/3

6:30 am-11:35 am

1 stop13h 05m

$803

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 3/9

3:35 pm-8:15 pm

2 stops21h 40m

Belfast Intl

Sun 3/15

5:45 am-4:40 pm

3 stops41h 55m

$808

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 3/26

3:35 pm-8:25 pm

2 stops21h 50m

Belfast Intl

Thu 4/2

10:20 am-8:40 pm

2 stops18h 20m

$849

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 4/3

5:30 am-3:30 pm

2 stops26h 00m

Belfast City

Sun 4/12

7:10 pm-11:35 am

1 stop24h 25m

$855

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 5/21

3:40 pm-7:30 pm

2 stops19h 50m

Belfast Intl

Tue 5/26

8:20 am-8:40 pm

2 stops20h 20m

$1,036

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 5/26

6:50 pm-11:00 pm

2 stops20h 10m

Belfast Intl

Wed 6/3

6:00 am-8:40 pm

3 stops22h 40m

$1,090

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 24 results
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Best time to book a flight from Seattle to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Belfast
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Belfast. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Belfast?

    If you book a flight to Belfast from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 0 flights from Seattle/Tacoma Intl to Belfast per day from 0 different airlines.

  • How long is the flight from Seattle to Belfast?

    Airlines like British Airways fly from Seattle to Belfast in about 16h 50m. The time it takes to get you to your destination can typically vary by up to . The distance between Seattle and Belfast is about 4472 mi.

  • Can I find deals for flights from Seattle to Belfast that include hotel bookings?

    Yes. In addition to deals on Seattle to Belfast flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Belfast?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Belfast.

  • Can I find deals for business class flights from Seattle to Belfast?

    Yes. Cheapflights offers flight deals from Seattle to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Belfast

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Belfast Intl flights
Seattle to Belfast City flights
Portland to Belfast Intl flights
Portland to Belfast City flights

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