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

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

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Frequently asked questions

How much does a flight from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA) cost?
Secure a cheap one-way flight or cheap return flight from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA)?
is the cheapest month to fly from BFS to SEA. Traveling during an off-peak travel window is often the key to finding better fares.
What is the cheapest airline that flies from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest BFS to SEA flight.
How many flights per day from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA)?
Direct flights from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from BFS to SEA?
Generally you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change depending on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA)?
To touch down at Seattle - Tacoma Intl. Airport (SEA) on schedule, book a flight that leaves Belfast Intl. Airport (BFS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your plane ticket from BFS to SEA just before your getaway is generally more expensive. However, if there's some wiggle room with your schedule, you could land a cheap last-minute fare.
Is it cheaper to book a BFS to SEA flight and hotel package?
Compared with arranging flights and hotels separately, booking a BFS to SEA flight and hotel package with Expedia could result in significant savings. What's more, having everything in one easy place will take the stress out of travel planning. Just secure your flights and select from our extensive range of hotels, then customize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA)?
In most cases, you're able to reschedule or cancel your BFS to SEA flight. However, additional fees may apply, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you want more details, go to our Customer Service portal.

Travel information

Travel information

Origin airport
Belfast Intl.
Destination airport
Seattle - Tacoma Intl.
Distance
4463 mi

Book with confidence

Book with confidence

Belfast to Seattle Flights

The cheapest times to fly from Belfast to Seattle

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 Belfast to Seattle are during the month of . You can find some of the cheapest flights from Belfast to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Belfast to Seattle

Sunday is one of the best days to book for cheap flights from Belfast to Seattle: 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 Belfast to Seattle

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 Belfast to Seattle 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 Belfast to Seattle 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 Belfast to Seattle 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.

 

Belfast to Seattle Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.