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Cheap flights from Seattle to Belfast City Airport from £299

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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
20 Dec — 27 Dec1
1 adult
1 adult, Economy, 0 bags

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 20 November 2025.

Round-trip from

£458

Popular in

June

Cheapest in

March

Average price

£616
British Airways
  • British Airways
  • 9/1-16/1
  • 2 total stops
  • 31h 05m total
  • Seattle to Belfast
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£102 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£24 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find flight deals from Seattle to Belfast City

Enter your travel dates to find the best prices.

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 20 November 2025.

Tue 18/1115:00SEA - BHD
1 stop22h 00mKLM
Tue 25/1106:30BHD - SEA
1 stop13h 15mKLM
Deal found 17/11£639
Tue 18/1113:35SEA - BHD
2 stops19h 10mAmerican Airlines
Tue 25/1108:45BHD - SEA
2 stops20h 14mAmerican Airlines
Deal found 17/11£640
Tue 18/1114:02SEA - BHD
2 stops22h 58mDelta
Tue 25/1106:30BHD - SEA
1 stop13h 15mDelta
Deal found 17/11£642
Fri 21/1120:05SEA - BHD
2 stops29h 45mAer Lingus
Fri 28/1106:50BHD - SEA
2 stops19h 30mAer Lingus
Deal found 20/11£958
Tue 18/1115:10SEA - BHD
3 stops17h 40mMultiple Airlines
Tue 25/1107:20BHD - SEA
2 stops17h 40mMultiple Airlines
Deal found 17/11£962
Fri 21/1115:00SEA - BHD
1 stop22h 00mKLM
Fri 28/1106:30BHD - SEA
1 stop13h 15mKLM
Deal found 20/11£1,099
Fri 21/1108:10SEA - BHD
3 stops28h 40mMultiple Airlines
Fri 28/1107:20BHD - SEA
2 stops17h 40mMultiple Airlines
Deal found 20/11£1,466
Wed 17/1220:05SEA - BHD
2 stops29h 45mMultiple Airlines
Sat 3/106:35BHD - SEA
2 stops20h 39mMultiple Airlines
Deal found 18/11£1,733
Wed 17/1218:50SEA - BHD
2 stops18h 00mBritish Airways
Sat 3/106:35BHD - SEA
2 stops22h 36mBritish Airways
Deal found 18/11£2,130

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 20 November 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

Fri 9/1

13:35-10:30

1 stop12h 55m

Belfast City

Fri 16/1

06:45-16:55

1 stop18h 10m

£458

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 20/2

13:35-10:30

1 stop12h 55m

Belfast City

Fri 27/2

06:45-11:30

1 stop12h 45m

£458

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 19/2

18:50-16:40

1 stop13h 50m

Belfast City

Wed 25/2

09:15-16:55

1 stop15h 40m

£458

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 5/2

18:50-16:40

1 stop13h 50m

Belfast City

Mon 9/2

17:45-16:55

1 stop31h 10m

£474

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 20/2

18:50-19:15

1 stop16h 25m

Belfast City

Fri 27/2

11:30-23:08

2 stops19h 38m

£481

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 14/1

11:55-14:15

2 stops18h 20m

Belfast City

Thu 22/1

11:05-22:20

2 stops19h 15m

£484

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 5/2

07:10-16:50

2 stops25h 40m

Belfast City

Mon 9/2

17:20-11:40

1 stop26h 20m

£494

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 6/3

06:00-20:50

3 stops30h 50m

£299

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 6/3

13:35-14:15

1 stop16h 40m

£356

Flights are sorted by cheapest return flights first.

Deals found on 20/11

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 12h 55m. 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.

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
Bangor
Newcastle
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

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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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