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Cheap flights from Seattle to Belfast City Airport from £276

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 13/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
18 10월 — 25 10월1
1 adult
1 adult, Economy

Cheap flight deals from Seattle to Belfast City

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Belfast City (BHD). 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 18 9월 2025.

Round-trip from

£515

One-way from

£276

Popular in

December

Cheapest in

March

Average price

£722
Finnair
  • Finnair
  • 7/3-18/3
  • 2 total stops
  • 30h 10m total
  • Seattle to Belfast
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13/12
  • 13/12
  • 3 total stops
  • 57h 54m total
  • Seattle to Belfast
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£39 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Find flight deals from Seattle to Belfast City

Cheapest flights from Seattle to Belfast City
Explore the most affordable flight options available from Seattle to Belfast City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 9월 2025.

금 3/1017:40SEA - BHD
1 stop15h 15mDelta
금 10/1006:30BHD - SEA
1 stop13h 20mDelta
Deal found 17/9£529
수 3/1207:20SEA - BHD
2 stops25h 30mDelta
일 7/1217:20BHD - SEA
2 stops34h 38mDelta
Deal found 17/9£539
수 3/1218:50SEA - BHD
1 stop16h 20mBritish Airways
일 7/1217:35BHD - SEA
1 stop31h 20mBritish Airways
Deal found 15/9£544
금 3/1015:00SEA - BHD
2 stops19h 15mAmerican Airlines
금 10/1011:55BHD - SEA
2 stops19h 01mAmerican Airlines
Deal found 16/9£555
목 9/1017:40SEA - BHD
1 stop19h 35mDelta
월 13/1006:30BHD - SEA
1 stop13h 20mDelta
Deal found 17/9£566
금 3/1017:40SEA - BHD
1 stop15h 15mKLM
금 10/1006:30BHD - SEA
1 stop13h 20mKLM
Deal found 16/9£571
목 9/1013:30SEA - BHD
1 stop21h 15mBritish Airways
월 13/1019:30BHD - SEA
2 stops33h 16mBritish Airways
Deal found 17/9£599

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Belfast City 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 858,174 searches. Data last updated 18 9월 2025.
Use the filters below to find and compare flights from Seattle to Belfast City Airport that are best for you.

Fly from

Seattle

Fly to

Belfast City

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

토 7/3

13:35-14:15

1 stop16h 40m

Belfast City

수 18/3

11:25-17:55

1 stop13h 30m

£515

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

토 7/3

13:35-14:15

1 stop16h 40m

Belfast City

화 17/3

11:25-17:55

1 stop13h 30m

£515

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

토 7/3

13:35-14:15

1 stop16h 40m

Belfast City

화 17/3

11:25-00:49

2 stops20h 24m

£523

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

토 7/3

13:35-11:10

1 stop13h 35m

Belfast City

수 18/3

11:25-00:49

2 stops20h 24m

£525

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

월 15/12

15:10-20:30

2 stops21h 20m

£313

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

금 12/12

13:35-10:30

1 stop12h 55m

£345

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

목 11/12

18:50-16:40

1 stop13h 50m

£357

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

화 16/12

09:00-16:20

3 stops23h 20m

£358

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

금 12/12

09:30-16:50

2 stops23h 20m

£363

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

목 11/12

11:15-21:00

2 stops25h 45m

£363

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 15 results
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Best time to book a flight from Seattle to Belfast City

Have a flexible travel schedule? Discover the best time to fly to Belfast City from Seattle with our price prediction graph.
Estimated return 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.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Belfast City. 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 City?

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

  • How long is the flight from Seattle to Belfast City Airport?

    Departing from Seattle to Belfast City Airport will take you 16h 40m. The distance between Seattle and Belfast City Airport is about 4472 mi.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from Seattle to Belfast City Airport?

    Currently, April is the cheapest month in which you can book a flight from Seattle to Belfast City Airport (average of £98). Flying from Seattle to Belfast City Airport in December is currently the most expensive (average of £116). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Belfast City Airport?

Book flights to Belfast City Airport if you plan to visit one of these locations
Newcastle
Bangor
Carrickfergus

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Belfast City

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

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Belfast City?

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Belfast City?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Belfast City for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Belfast City with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Belfast City with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Belfast City become cheaper?

Yes! Start tracking prices for Seattle to Belfast City flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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