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$467+ 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 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
Jul 31 — Aug 71
Fri 7/31
Fri 8/7
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 July 1, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 6/30. 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.
Mon 10/51:30 pm
SEA
-
BHD
1 stop15h 25m
British Airways
Thu 10/2212:45 pm
BHD
-
SEA
1 stop13h 40m
British Airways
Deal found 6/30$885
This Priceline deal was found by Cheapflights users on 6/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/48:20 pm
SEA
-
BHD
1 stop14h 25m
British Airways
Sun 10/188:10 pm
BHD
-
SEA
1 stop23h 25m
British Airways
Deal found 6/28$903
This Mytrip deal was found by Cheapflights users on 6/29. 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 8/187:00 pm
SEA
-
BFS
3 stops20h 20m
Multiple Airlines
Tue 8/257:00 am
BFS
-
SEA
3 stops34h 40m
Multiple Airlines
Deal found 6/29$905
This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:20 pm
SEA
-
BHD
2 stops16h 10m
American Airlines
Thu 10/226:30 am
BHD
-
SEA
1 stop13h 05m
American Airlines
Deal found 6/30$906
This Kiwi.com deal was found by Cheapflights users on 6/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/49:45 pm
SEA
-
BFS
1 stop30h 30m
Multiple Airlines
Sun 10/187:35 pm
BFS
-
SEA
2 stops29h 35m
Multiple Airlines
Deal found 6/28$908
This Priceline deal was found by Cheapflights users on 6/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/118:11 am
SEA
-
BHD
2 stops18h 04m
British Airways
Sun 11/1512:10 pm
BHD
-
SEA
1 stop12h 45m
British Airways
Deal found 6/28$908
This Mytrip deal was found by Cheapflights users on 6/28. 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 9/113:40 pm
SEA
-
BFS
3 stops21h 05m
Multiple Airlines
Wed 9/168:15 pm
BFS
-
SEA
3 stops32h 25m
Multiple Airlines
Deal found 6/28$987
This Cheapflightsfares deal was found by Cheapflights users on 6/28. 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.
Fri 9/118:20 pm
SEA
-
BHD
1 stop13h 50m
British Airways
Wed 9/166:30 am
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 6/28$989
This Cheapflightsfares deal was found by Cheapflights users on 6/30. 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.
Fri 8/148:20 pm
SEA
-
BHD
1 stop16h 15m
British Airways
Fri 8/216:30 am
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 6/30$990
This Mytrip deal was found by Cheapflights users on 7/1. 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 8/145:50 am
SEA
-
BFS
3 stops31h 25m
Multiple Airlines
Fri 8/218:55 am
BFS
-
SEA
2 stops16h 15m
Multiple Airlines
Deal found 7/1$1,044
This Mytrip deal was found by Cheapflights users on 6/26. 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 8/103:40 pm
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Mon 8/176:30 am
BFS
-
SEA
3 stops35h 10m
Multiple Airlines
Deal found 6/26$1,060

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 July 1, 2026.

Round-trip from

$885
(Cheapflightsfares)

One-way from

$467
(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 July 1, 2026.
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

8:20 pm-8:35 pm

1 stop16h 15m

Belfast City

Thu 10/22

8:35 pm-11:35 am

1 stop23h 00m

$885

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 8/18

7:00 pm-11:20 pm

3 stops20h 20m

Belfast Intl

Tue 8/25

7:00 am-9:40 am

3 stops34h 40m

$905
Quickest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

3:10 pm-3:30 pm

2 stops16h 20m

Belfast City

Thu 10/22

6:30 am-11:35 am

1 stop13h 05m

$906

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

3:10 pm-3:30 pm

2 stops16h 20m

Belfast City

Thu 10/22

6:30 am-7:30 pm

2 stops21h 00m

$918

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 10/4

9:45 pm-12:15 pm

1 stop30h 30m

Belfast Intl

Sun 10/18

7:35 pm-6:55 pm

1 stop31h 20m

$958

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 11/11

2:35 pm-8:45 pm

3 stops22h 10m

Belfast Intl

Sun 11/15

7:00 am-5:00 pm

3 stops42h 00m

$994

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 8/14

5:50 am-9:15 pm

3 stops31h 25m

Belfast Intl

Fri 8/21

8:55 am-5:10 pm

2 stops16h 15m

$1,044

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/10

3:40 pm-11:20 pm

3 stops23h 40m

Belfast Intl

Mon 8/17

6:30 am-9:40 am

3 stops35h 10m

$1,060

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 7/15

2:30 pm-4:55 pm

2 stops18h 25m

Belfast City

Sat 7/18

9:50 am-4:20 pm

1 stop14h 30m

$8,418

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 7/15

9:05 am-9:20 am

2 stops16h 15m

Belfast City

Sat 7/18

9:50 am-7:02 pm

2 stops17h 12m

$8,419

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/27

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

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.

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Belfast. Reviews last updated July 1, 2026.
Read reviews from past customers who have flown British Airways from Seattle to Belfast. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
8,087 reviews

Food

6.4

Boarding

6.9

Crew

7.7

Entertainment

6.4

Overall

6.7

Comfort

6.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.
British Airways
6.7
Okay
8,087 reviews
British Airways
6.7
Okay
8,087 reviews

Food

6.4

Boarding

6.9

Crew

7.7

Entertainment

6.4

Overall

6.7

Comfort

6.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.

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 1 airline.

  • How long is the flight from Seattle to Belfast?

    Airlines like British Airways and American Airlines fly from Seattle to Belfast in about 15h 25m. The time it takes to get you to your destination can typically vary by up to 55m. The distance between Seattle and Belfast is about 4472 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from Seattle to Belfast round-trip?

    Flying on British Airways is currently your cheapest option to Belfast, with prices starting at $807.

  • 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

Top airline flying from Seattle to Belfast

Discover the top airline that operate flights from Seattle to Belfast. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$807Average$1,091FlexibilityNo cancel feeOn-time70%

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