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Cheap flights from Seattle to Belfast City Airport from £265

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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
31 Mar — 7 Apr1
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 26 March 2025.

Round-trip from

£560

One-way from

£265

Popular in

June

Cheapest in

October

Average price

£591
2/5-11/5
  • 2/5-11/5
  • 4 total stops
  • 39h 00m total
  • Seattle to Belfast
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12/8
  • 12/8
  • 2 total stops
  • 37h 05m total
  • Seattle to Belfast
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£119 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease (£32 potential savings vs. average return price).
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Average for round-trip flights in March 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 26 March 2025.

Tue 28/1014:35SEA - BHD
1 stop16h 00mAmerican Airlines
Tue 4/1111:30BHD - SEA
1 stop13h 25mAmerican Airlines
Deal found 25/3£546
Fri 2/519:00SEA - BHD
2 stops17h 25mMultiple Airlines
Sun 11/507:05BHD - SEA
2 stops21h 35mMultiple Airlines
Deal found 25/3£560
Tue 6/513:30SEA - BHD
1 stop13h 05mBritish Airways
Tue 13/506:35BHD - SEA
1 stop12h 35mBritish Airways
Deal found 24/3£569
Sun 4/518:07SEA - BHD
1 stop19h 08mDelta
Mon 12/517:25BHD - SEA
1 stop30h 32mDelta
Deal found 25/3£631
Fri 2/518:45SEA - BHD
2 stops15h 30mAer Lingus
Mon 12/518:00BHD - SEA
2 stops30h 59mAer Lingus
Deal found 25/3£717
Fri 2/520:20SEA - BHD
2 stops16h 55mKLM
Sat 10/506:30BHD - SEA
2 stops17h 38mKLM
Deal found 25/3£938

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 26 March 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 2/5

19:00-20:25

2 stops17h 25m

Belfast City

Sun 11/5

07:05-20:40

2 stops21h 35m

£560

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 6/5

13:30-10:35

1 stop13h 05m

Belfast City

Tue 13/5

06:35-11:10

1 stop12h 35m

£569

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 4/5

18:07-21:15

1 stop19h 08m

Belfast City

Mon 12/5

17:25-15:57

1 stop30h 32m

£631

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 2/5

20:20-20:45

1 stop16h 25m

Belfast City

Sun 11/5

06:50-11:30

1 stop12h 40m

£706

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 2/5

18:45-18:15

2 stops15h 30m

Belfast City

Mon 12/5

18:00-16:59

2 stops30h 59m

£717

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/5

18:10-21:15

1 stop19h 05m

Belfast City

Sat 10/5

06:30-16:08

2 stops17h 38m

£775

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 12/8

23:30-20:35

2 stops37h 05m

£265

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 13/8

20:20-20:45

1 stop16h 25m

£438

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 30/8

18:45-09:15

2 stops30h 30m

£523

Flights are sorted by cheapest return flights first.

Deals found on 26/3

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Belfast City Airport

Rainfall in Belfast City by month

Plan your trip to Belfast City by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Belfast City Airport ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast City Airport when rainfall is around 50.0 mm.

Temperature in Belfast City by month

Plan your trip to Belfast City by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Belfast City Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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 26 March 2025.
Delta
8.0
Very Good
7,891 reviews
Check prices

Comfort

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very Good
7,891 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Comfort

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,319 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Comfort

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Comfort

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Aer Lingus
7.0
Good
1,062 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Comfort

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
British Airways
6.6
Okay
6,712 reviews
Delta
8.0
Very Good
7,891 reviews
Check prices

Comfort

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 £569. Other airlines that can offer you cheap pricing are Delta, from £631, and American Airlines, from £706.

  • 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Newcastle
Carrickfergus
Bangor

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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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