Cheap Flights from Seattle (SEA) to Belfast (BFS)

Popular airlines from Seattle-Tacoma International Airport (SEA) to Belfast International Airport (BFS)

Find the cheapest month to fly from Seattle (SEA) to Belfast (BFS)

October is typically the cheapest month to fly

From $645 - $1,039 per traveler.

Graph displaying average flight prices per month

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 $878
BHD
George Best Belfast City
CheapestClosest
Average driving time to city center6 min
Flights from $878
Flights from Seattle (SEA) to Belfast (BFS)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Belfast Intl.
Distance
4463 mi

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 . 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 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.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS) cost?
Snag a cheap one-way flight or cheap return flight from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS)?
is the least expensive month to fly from SEA to BFS. Avoiding peak travel times is often the key to scoring lower fares.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll take you from SEA to BFS. Then, sort your results by "Price (lowest to highest)" to score a good deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS)?
You'll have to hop on a flight with a layover when traveling from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from SEA to BFS?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary 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 Belfast Intl. Airport (BFS)?
Book a flight from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS) that takes off before 3 PM to reduce the risk of delays and cancellations. Departures after this time are on average 22% more likely to be 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 Belfast Intl. Airport (BFS) last-minute?
Last-minute bookings from SEA to BFS are generally more expensive. To secure the cheapest rates, start searching for flights as early as possible. That said, if you're flexible with your travel dates, you may land a cheap fare right before your journey.
Is it cheaper to book a SEA to BFS flight and hotel package?
Compared with arranging flights and hotels separately, booking a SEA to BFS flight and hotel package with Expedia could result in significant savings. What's more, having everything in one convenient place will take the hassle out of travel planning. Simply pick your flights and choose from our extensive range of hotels, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Belfast Intl. Airport (BFS)?
If you reserved your SEA to BFS flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more information.

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*Available to One Key members.