$427 Cheap Flights from Seattle (SEA) to Belfast (BHD)

View $427 flight on Wed, Jan 14, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Belfast (BHD-George Best Belfast City)

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Cheap Flights from Seattle to Belfast (SEA-BHD)

Prices were available within the past 7 days and start at $427 for one-way flights and $665 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Sat, Dec 6 - Sat, Dec 13
SEA
Seattle
BHD
Belfast
$665 Roundtrip, found 20 hours ago
$665
Roundtrip
found 20 hours ago
Select British Airways flight, departing Sat, Dec 6 from Seattle to Belfast, returning Sat, Dec 13, priced at $665 found 20 hours ago
American Airlines
Mon, Nov 24 - Mon, Dec 8
SEA
Seattle
BHD
Belfast
$668 Roundtrip, found 3 days ago
$668
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Nov 24 from Seattle to Belfast, returning Mon, Dec 8, priced at $668 found 3 days ago
American Airlines
Mon, Nov 24 - Mon, Dec 8
SEA
Seattle
BHD
Belfast
$670 Roundtrip, found 3 days ago
$670
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Nov 24 from Seattle to Belfast, returning Mon, Dec 8, priced at $670 found 3 days ago
American Airlines
Mon, Jan 5 - Wed, Jan 21
SEA
Seattle
BHD
Belfast
$671 Roundtrip, found 6 days ago
$671
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Jan 5 from Seattle to Belfast, returning Wed, Jan 21, priced at $671 found 6 days ago
American Airlines
Wed, Jan 14 - Wed, Jan 21
SEA
Seattle
BHD
Belfast
$673 Roundtrip, found 6 hours ago
$673
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Wed, Jan 14 from Seattle to Belfast, returning Wed, Jan 21, priced at $673 found 6 hours ago
American Airlines
Wed, Jan 7 - Mon, Jan 12
SEA
Seattle
BHD
Belfast
$673 Roundtrip, found 2 days ago
$673
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Jan 7 from Seattle to Belfast, returning Mon, Jan 12, priced at $673 found 2 days ago
British Airways
Thu, Jan 1 - Wed, Jan 14
SEA
Seattle
BHD
Belfast
$674 Roundtrip, found 5 days ago
$674
Roundtrip
found 5 days ago
Select British Airways flight, departing Thu, Jan 1 from Seattle to Belfast, returning Wed, Jan 14, priced at $674 found 5 days ago
Virgin Atlantic
Wed, Dec 3 - Fri, Dec 12
SEA
Seattle
BHD
Belfast
$684 Roundtrip, found 5 days ago
$684
Roundtrip
found 5 days ago
Select Virgin Atlantic flight, departing Wed, Dec 3 from Seattle to Belfast, returning Fri, Dec 12, priced at $684 found 5 days ago
Delta
Tue, Nov 18 - Tue, Dec 2
SEA
Seattle
BHD
Belfast
$685 Roundtrip, found 1 day ago
$685
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Nov 18 from Seattle to Belfast, returning Tue, Dec 2, priced at $685 found 1 day ago
KLM
Mon, Nov 24 - Mon, Dec 8
SEA
Seattle
BHD
Belfast
$784 Roundtrip, found 3 days ago
$784
Roundtrip
found 3 days ago
Select KLM flight, departing Mon, Nov 24 from Seattle to Belfast, returning Mon, Dec 8, priced at $784 found 3 days ago

Alternative airports near Belfast

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to George Best Belfast City BHD. Cheapest and Closest option available. Average driving time to city center is 6 minutes. Flights from $935
BHD
George Best Belfast City
CheapestClosest
Average driving time to city center6 min
Flights from $935

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD) cost?
Lock in a cheap one-way flight from $427 or cheap return flight from $665 from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD)?
The cheapest month to fly from SEA to BHD is December, when there's less demand. Off-peak months are generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from SEA to BHD. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD)?
You'll have to hop on a flight with a layover when traveling from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from SEA to BHD?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD)?
To avoid possible delays on the Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD) route, travel before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD) last-minute?
Last-minute bookings from SEA to BHD are usually more expensive. To lock in the best rates, start looking for flights early. That being said, if you can play around with your travel dates, it's possible to score a cheap ticket right before your trip.
Is it cheaper to book a SEA to BHD flight and hotel package?
Securing a SEA to BHD flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Choose from our extensive range of hotels and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to George Best Belfast City Airport (BHD)?
If you booked your SEA to BHD flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for further details.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
George Best Belfast City
Airlines serving
American Airlines, British Airways, Delta, Finnair, KLM, Virgin Atlantic
Roundtrip price
$665
Distance
4475 mi

Book with confidence

Seattle to Belfast Flights

The cheapest times to fly from Seattle to Belfast

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Belfast are during the month of December. You can find some of the cheapest flights from Seattle to Belfast with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Belfast

Sunday is one of the best days to book for cheap flights from Seattle to Belfast: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Belfast

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Belfast in 2025. You can also book with separate airlines for your outbound and return journeys, from $427 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Belfast flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Belfast airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Seattle to Belfast Flights

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*Available to One Key members.