HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$884+ Cheap flights from Belfast to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
Apr 28 — May 51
Tue 4/28
Tue 5/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Belfast to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Belfast to Seattle

Cheapest flights from Belfast to Seattle
Explore the most affordable flight options available from Belfast to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 29, 2026.

This Mytrip deal was found by Cheapflights users on 3/28. 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.
Tue 5/128:20 am
BFS
-
SEA
2 stops20h 20m
Multiple Airlines
Tue 5/197:00 pm
SEA
-
BFS
2 stops17h 55m
Multiple Airlines
Deal found 3/28$884
This TravelUp deal was found by Cheapflights users on 3/26. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:25 pm
BHD
-
SEA
1 stop23h 10m
British Airways
Fri 4/241:19 pm
SEA
-
BHD
2 stops18h 11m
British Airways
Deal found 3/26$987
This British Airways deal was found by Cheapflights users on 3/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2310:05 am
BHD
-
SEA
2 stops19h 04m
British Airways
Sun 9/271:30 pm
SEA
-
BHD
1 stop13h 00m
British Airways
Deal found 3/28$991
This British Airways deal was found by Cheapflights users on 3/25. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/88:10 pm
BHD
-
SEA
2 stops34h 28m
British Airways
Tue 5/121:30 pm
SEA
-
BHD
1 stop22h 10m
British Airways
Deal found 3/25$1,024
This British Airways deal was found by Cheapflights users on 3/24. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/610:05 am
BHD
-
SEA
2 stops22h 31m
British Airways
Sun 5/108:20 pm
SEA
-
BHD
1 stop14h 25m
British Airways
Deal found 3/24$1,048
This Trip.com deal was found by Cheapflights users on 3/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/109:55 am
BFS
-
SEA
2 stops18h 45m
Multiple Airlines
Sun 5/177:00 pm
SEA
-
BFS
2 stops17h 15m
Multiple Airlines
Deal found 3/26$1,095
This Mytrip deal was found by Cheapflights users on 3/26. 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.
Tue 4/148:10 pm
BFS
-
SEA
3 stops33h 43m
Multiple Airlines
Fri 4/243:40 pm
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Deal found 3/26$1,191

Find flight deals from Belfast to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) to Seattle (SEA). 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 March 29, 2026.

Round-trip from

$884
(Mytrip)
From Belfast to Seattle/Tacoma Intl
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Belfast to Seattle 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 March 29, 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 5/12

8:20 am-8:40 pm

2 stops20h 20m

Seattle/Tacoma Intl

Tue 5/19

7:00 pm-8:55 pm

2 stops17h 55m

$884

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 9/23

10:05 am-12:15 am

2 stops22h 10m

Seattle/Tacoma Intl

Sun 9/27

8:20 am-10:30 am

2 stops18h 10m

$999

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 5/8

7:35 pm-10:38 pm

2 stops35h 03m

Seattle/Tacoma Intl

Tue 5/12

1:30 pm-7:40 pm

1 stop22h 10m

$1,024

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 5/6

7:40 pm-11:35 am

1 stop23h 55m

Seattle/Tacoma Intl

Sun 5/10

8:20 pm-6:45 pm

1 stop14h 25m

$1,048
Quickest round-trip

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 5/10

9:55 am-8:40 pm

2 stops18h 45m

Seattle/Tacoma Intl

Sun 5/17

7:00 pm-8:15 pm

2 stops17h 15m

$1,095

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 4/14

8:10 pm-9:53 pm

3 stops33h 43m

Seattle/Tacoma Intl

Fri 4/24

3:40 pm-11:20 pm

3 stops23h 40m

$1,191
Cheapest one-way
Quickest one-way

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 8/3

3:20 pm-11:35 am

1 stop28h 15m

$1,087

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Sorted by cheapest first

Best time to book a flight from Belfast to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast 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 Belfast to Seattle
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 Belfast to Seattle. 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 into for flights to Seattle from Belfast?

    Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Belfast to Seattle. You should not have trouble finding flights to Seattle/Tacoma Intl from Belfast; the airport handles an average of 0 inbound flights from Belfast per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Seattle airport from Belfast. It is only a 11.4 mi journey from Seattle/Tacoma Intl (SEA) to Seattle’s city center.

  • How long is the flight from Belfast to Seattle?

    Departing from Belfast to Seattle will take you 13h 05m. Airlines will cover a distance of 4472 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Belfast to Seattle 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

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Snoqualmie
Ellensburg
Tukwila
Fife
Lakewood
Leavenworth
Issaquah
Aberdeen
Shoreline

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.