Which airports can I use when flying from Belfast to Seattle?

Flights from Belfast to Seattle may depart from several airports in Belfast area, including Belfast Intl (BFS) and Belfast City (BHD). Flights usually arrive at Seattle/Tacoma Intl (SEA).

Which cabin classes can I book on flights from Belfast to Seattle?

Only Economy class is available on flights from Belfast to Seattle.

Which airports do connecting flights from Belfast to Seattle pass through?

Most connecting flights from Belfast to Seattle pass through London Heathrow (LHR), which handles 100% of one-stop traffic on this route. Other stopover airports each see under 5%.

Can I save money by using flexible dates for flights from Belfast to Seattle?

Yes. Being flexible with your travel dates can save you up to 46% on the Belfast to Seattle route. Thursday is the cheapest departure day at £569 return on average, while Sunday is the most expensive at £1,049, a difference of £480. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

What popular places can I visit in Seattle?

Some of the most popular sights in Seattle are The Westin Seattle, Seattle Center, and Seattle Marriott Waterfront. These are among the most viewed places in Seattle on KAYAK.

How long is a flight from Belfast to Seattle?

A direct flight from Belfast to Seattle takes 0h 00m, covering 4,471 miles.

Do I need a passport to fly from Belfast to Seattle?

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Have flight prices from Belfast to Seattle changed much recently?

Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about £490 to £1,415. That means the highest observed fare was about 3x higher than the lowest one.

What is the time difference between Belfast and Seattle?

Seattle is 8 hours behind Belfast (Pacific Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.

Which car hire options are available at Seattle/Tacoma Intl Airport (SEA)?

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car hire companies, with daily rates starting from around £3 for economy cars. Top options include: • Fox • Europcar • Thrifty • Budget • Dollar

How much should I expect to pay for a Belfast to Seattle flight?

Return flights from Belfast to Seattle range from £713 to £748, with an average of £731 over the past 12 months. Anything below £713 counts as a good deal.

What is the cheapest stopover airport when flying from Belfast to Seattle?

Flights via London Heathrow (LHR) offer the most affordable fares, with an average return price of £807. Based on KAYAK data over the past 3 months.

When flying from Belfast to Seattle, which airport offers the shortest stopover?

London Heathrow (LHR) had the shortest average connection time for Belfast to Seattle stopovers at 518 minutes over the past 3 months.

£490 CHEAP FLIGHTS from Belfast to Seattle (BF1 - SEA)

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Cheapest return flight

£490

Typical prices: £713-£748

Multiple Airlines

Fri 12/10Fri 19/10

BFS - SEA • 1 stop

Direct flights

Not available

There are currently no direct flights between Belfast and Seattle. You'll need to take a connecting flight to reach the destination.

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Flight Deals

Cheap Flights from Belfast to Seattle

Discover the best prices for you by selecting your travel dates on KAYAK.

Return

One-way

Recent return flight deals from Belfast to Seattle

Mon, 12 Oct - Mon, 19 Oct

10:00 - 20:14BFS Belfast Intl-SEA Seattle/Tacoma Intl

18h 14m1 stop London Luton

17:30 - 18:50SEA Seattle/Tacoma Intl-BFS Belfast Intl

17h 20m1 stop London Heathrow

£490Multiple Airlines

Mon, 12 Oct - Mon, 19 Oct

07:00 - 20:14BHD Belfast City-SEA Seattle/Tacoma Intl

21h 14m1 stop London Gatwick

17:30 - 20:30SEA Seattle/Tacoma Intl-BHD Belfast City

19h 00m1 stop London Heathrow

£509Multiple Airlines

Wed, 18 Nov - Fri, 11 Dec

09:15 - 16:50BHD Belfast City-SEA Seattle/Tacoma Intl

15h 35m1 stop London Heathrow

18:45 - 17:25SEA Seattle/Tacoma Intl-BHD Belfast City

14h 40m1 stop London Heathrow

£564British Airways

Wed, 18 Nov - Fri, 11 Dec

06:55 - 09:32BFS Belfast Intl-SEA Seattle/Tacoma Intl

34h 37m3 stops Paris Charles de Gaulle Calgary Vancouver Intl

14:35 - 22:35SEA Seattle/Tacoma Intl-BFS Belfast Intl

24h 00m2 stops Reykjavik Keflavik Intl Manchester

£564Multiple Airlines

Wed, 18 Nov - Fri, 11 Dec

17:35 - 11:25BHD Belfast City-SEA Seattle/Tacoma Intl

25h 50m1 stop London Heathrow

09:15 - 10:55SEA Seattle/Tacoma Intl-BHD Belfast City

17h 40m2 stops Philadelphia London Heathrow

£567British Airways

Mon, 12 Oct - Mon, 19 Oct

06:30 - 11:35BHD Belfast City-SEA Seattle/Tacoma Intl

13h 05m1 stop London Heathrow

10:31 - 12:55SEA Seattle/Tacoma Intl-BHD Belfast City

18h 24m2 stops Chicago O'Hare Intl London Heathrow

£569Multiple Airlines

Wed, 18 Nov - Fri, 11 Dec

12:20 - 00:35BHD Belfast City-SEA Seattle/Tacoma Intl

20h 15m2 stops London Heathrow Chicago O'Hare Intl

06:14 - 10:55SEA Seattle/Tacoma Intl-BHD Belfast City

20h 41m2 stops Chicago O'Hare Intl London Heathrow

£577British Airways

Thu, 5 Nov - Thu, 12 Nov

09:05 - 17:00BFS Belfast Intl-SEA Seattle/Tacoma Intl

15h 55m2 stops Manchester Reykjavik Keflavik Intl

14:35 - 18:45SEA Seattle/Tacoma Intl-BFS Belfast Intl

20h 10m2 stops Reykjavik Keflavik Intl Manchester

£589Multiple Airlines

Thu, 15 Oct - Mon, 19 Oct

20:35 - 11:35BHD Belfast City-SEA Seattle/Tacoma Intl

23h 00m1 stop London Heathrow

20:20 - 20:35SEA Seattle/Tacoma Intl-BHD Belfast City

16h 15m1 stop London Heathrow

£599British Airways

Thu, 15 Oct - Mon, 19 Oct

12:45 - 18:25BHD Belfast City-SEA Seattle/Tacoma Intl

13h 40m1 stop London Heathrow

10:31 - 15:30SEA Seattle/Tacoma Intl-BHD Belfast City

20h 59m2 stops Chicago O'Hare Intl London Heathrow

£599British Airways

Booking Insights

Price, demand, and travel trends for Belfast to Seattle flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Belfast to Seattle with more confidence.

Airlines

Stopovers

What is the cheapest airline to fly from Belfast to Seattle?

British Airways (£564) offered the cheapest return ticket from Belfast to Seattle in the last 5 days.

Find deals

Cheapest flight	£490

Flights from Belfast Intl Airport to Seattle

When to book flights from Belfast to Seattle

Are your dates flexible? Find out the best times to travel from Belfast to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated return price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Which cabin classes can I book on flights from Belfast to Seattle?
Only Economy class is available on flights from Belfast to Seattle.
How long is a flight from Belfast to Seattle?
A direct flight from Belfast to Seattle takes 0h 00m, covering 4,471 miles.
Do I need a passport to fly from Belfast to Seattle?
Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.
How much should I expect to pay for a Belfast to Seattle flight?
Return flights from Belfast to Seattle range from £713 to £748, with an average of £731 over the past 12 months. Anything below £713 counts as a good deal.
Have flight prices from Belfast to Seattle changed much recently?
Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about £490 to £1,415. That means the highest observed fare was about 3x higher than the lowest one.
Which car hire options are available at Seattle/Tacoma Intl Airport (SEA)?
Seattle/Tacoma Intl Airport (SEA) hosts 5 major car hire companies, with daily rates starting from around £3 for economy cars. Top options include:
• Fox
• Europcar
• Thrifty
• Budget
• Dollar
Which airports can I use when flying from Belfast to Seattle?
Flights from Belfast to Seattle may depart from several airports in Belfast area, including Belfast Intl (BFS) and Belfast City (BHD). Flights usually arrive at Seattle/Tacoma Intl (SEA).
Which airports do connecting flights from Belfast to Seattle pass through?
Most connecting flights from Belfast to Seattle pass through London Heathrow (LHR), which handles 100% of one-stop traffic on this route. Other stopover airports each see under 5%.
Can I save money by using flexible dates for flights from Belfast to Seattle?
Yes. Being flexible with your travel dates can save you up to 46% on the Belfast to Seattle route. Thursday is the cheapest departure day at £569 return on average, while Sunday is the most expensive at £1,049, a difference of £480. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
What is the time difference between Belfast and Seattle?
Seattle is 8 hours behind Belfast (Pacific Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.
What popular places can I visit in Seattle?
Some of the most popular sights in Seattle are The Westin Seattle, Seattle Center, and Seattle Marriott Waterfront. These are among the most viewed places in Seattle on KAYAK.

If your dates are flexible, aim for a Thursday departure instead of Sunday. On this route, Thursday flights average £569 – about £480 less than Sunday (46% savings) based on the last 12 months.
If you're arriving late at night and need somewhere to stay, check out these hotels close to Seattle/Tacoma Intl Airport.
- Seattle Airport Marriott
- Coast Gateway Hotel
- Fairfield by Marriott Inn & Suites Seattle Sea-Tac Airport

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£490 Find Cheap Flights from Belfast to Seattle – Compare and Save

Everything you should know

Cheap Flights from Belfast to Seattle

Recent return flight deals from Belfast to Seattle

Recent one-way flight deals from Belfast to Seattle

Price, demand, and travel trends for Belfast to Seattle flights

What is the cheapest airline to fly from Belfast to Seattle?

What is the cheapest stopover airport when flying from Belfast to Seattle?

When flying from Belfast to Seattle, which airport offers the shortest stopover?

Key details for Belfast to Seattle flights

Cheapest flight

When to book flights from Belfast to Seattle

Your Belfast to Seattle flight questions, answered

Your guide to booking Belfast to Seattle flights

More options for your flight from Belfast to Seattle

Complete your trip to Seattle with a hotel stay or car hire

Information on your arrival and departure airports

Cabin class types available on flights from Belfast to Seattle

Find direct flights to and from Belfast and Seattle

Flights from domestic origins to Seattle

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