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Cheap flights from Seattle to Belfast City Airport from £528

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
20 Jul — 27 Jul1
1 adult

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 15 July 2025.

Round-trip from

£528

Popular in

July

Cheapest in

March

Average price

£850
1/10-17/10
  • 1/10-17/10
  • 4 total stops
  • 38h 25m total
  • Seattle to Belfast
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£67 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 15 July 2025.

Wed 1/1019:00SEA - BHD
2 stops16h 45mMultiple Airlines
Fri 17/1007:00BHD - SEA
2 stops21h 40mMultiple Airlines
Deal found 13/7£528
Wed 1/1020:20SEA - BHD
1 stop14h 20mBritish Airways
Fri 17/1006:35BHD - SEA
2 stops22h 11mBritish Airways
Deal found 13/7£576
Wed 1/1014:10SEA - BHD
1 stop18h 45mKLM
Fri 17/1006:30BHD - SEA
1 stop13h 20mKLM
Deal found 13/7£599
Wed 3/1215:00SEA - BHD
1 stop17h 50mDelta
Sun 7/1206:30BHD - SEA
1 stop13h 20mDelta
Deal found 13/7£637
Wed 3/1207:20SEA - BHD
2 stops29h 40mVirgin Atlantic
Sun 7/1217:20BHD - SEA
1 stop26h 30mVirgin Atlantic
Deal found 13/7£640
Tue 2/1201:23SEA - BHD
2 stops24h 52mAmerican Airlines
Sun 7/1212:10BHD - SEA
1 stop12h 45mAmerican Airlines
Deal found 14/7£731

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 15 July 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

Wed 1/10

19:00-19:45

2 stops16h 45m

Belfast City

Fri 17/10

07:00-20:40

2 stops21h 40m

£528

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 1/10

20:20-18:40

1 stop14h 20m

Belfast City

Fri 17/10

06:35-20:46

2 stops22h 11m

£576

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 1/10

14:10-16:55

1 stop18h 45m

Belfast City

Fri 17/10

06:30-11:50

1 stop13h 20m

£599

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

15:00-16:50

1 stop17h 50m

Belfast City

Sun 7/12

06:30-11:50

1 stop13h 20m

£637

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

07:20-21:00

2 stops29h 40m

Belfast City

Sun 7/12

17:20-11:50

1 stop26h 30m

£640

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 2/12

01:23-10:15

2 stops24h 52m

Belfast City

Sun 7/12

12:10-16:55

1 stop12h 45m

£731

Flights are sorted by cheapest return flights first.

Deals found on 13/7

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.

Reviews of airlines servicing Belfast City

Get insights into the airlines that provide service to Belfast City. 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 City. Reviews last updated 15 July 2025.
Read reviews from past customers who have flown with Delta, KLM, andVirgin Atlantic from Seattle to Belfast City Airport. 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.
Delta
8.0
Very Good
7,956 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very Good
7,956 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
British Airways
6.6
Okay
7,134 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • What are the cheapest airlines flying from Seattle to Belfast City Airport round-trip?

    Cheapflights users have booked flights from Seattle to Belfast City Airport round-trip from £576. Other airlines that can offer you cheap pricing are KLM, from £599, and Delta, from £637.

  • 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

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

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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