Cheap Flights from Belfast to Seattle

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Flight deals from Belfast to Seattle

Looking for a cheap last-minute deal or the best return flight from Belfast to Seattle? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Belfast to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Belfast to Seattle flights are currently cheapest in April.

Alternative Belfast to Seattle routes

Looking for the cheapest, fastest or easiest route from Belfast to Seattle? You could fly into the following airports instead.

Belfast to Seattle: Flight information

The things to know before you go.
Cheapest flight found656 €
Cheapest month to flyMay

Finding cheap flights from Belfast to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Belfast to Seattle is 656 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Belfast to Seattle. But we found flights with one or more stops from 656 €.
As of April 2025, there are no flights flying from Belfast to Seattle.
The cheapest month to fly from Belfast to Seattle is usually April 2025.
If you're flying from Belfast, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from 656 €.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Belfast to Seattle on Wednesday, 28 May 2025.
No airlines currently offer direct flights between Belfast and Seattle. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
The cheapest airline that flies to Seattle is easyJet .

Flying from Belfast to Seattle: what you need to know

  • Begin planning your holiday by considering the departure point for your flight from Belfast to Seattle. Belfast International Airport (BFS) and George Best Belfast City Airport (BHD) are Belfast's main airports.

  • Arrive in Seattle at Seattle-Tacoma International Airport (SEA) or Lake Union Sea Plane Base Airport (LKE).

  • The timezone in Seattle is UTC-7, which is seven hours behind Belfast.

  • For a stress-free start to your trip, turn up at the airport two hours ahead of international flights and one hour before domestic departures. That way, you can comfortably catch your Belfast to Seattle flight.

  • You can expect longer queues during popular months such as August. Arriving up to four hours ahead of an international flight and two hours for a domestic departure will help ensure a smooth travel experience.

How to find the cheapest flights from Belfast to Seattle

  • Don't leave things to the last minute. You're more likely to get cheap Belfast to Seattle flights if you book in advance. Airlines often offer some excellent early bird discounts.

  • The 'Whole month' search tool shows you the cheapest plane tickets from Belfast to Seattle across each month. It's an easy way to find a bargain if your travel dates aren't set in stone.

  • Spend less time searching for cheap flights from Belfast to Seattle by setting up a Price Alert. You'll get an email or notification through the app when a lower fare becomes available.

  • Select your ideal arrival and departure times, number of stops and airlines with the filters. Or sort your Belfast to Seattle flight results by 'Fastest,' 'Cheapest' or 'Best.'

Flying from Belfast

Belfast International Airport (BFS)

  • We make it a cinch to book a Belfast to Seattle flight with a stopover. To see your options leaving from Belfast International Airport, deselect 'Direct flights only.' Then, select a flight offering a stop long enough to explore the city of your choice. Popular stopovers include:

    • Charles de Gaulle Airport (CDG)

    • Keflavik International Airport (KEF)

    • Amsterdam Airport Schiphol (AMS)

  • The journey from central Belfast to BFS takes about 2 hours on public transport. If you ride-share, drive or take a cab, you'll cover the 19 kilometres in 30 minutes or so, depending on traffic conditions.

  • Have an early flight from Belfast to Seattle? Avoid the stress of rushing to the airport (and catch some extra z's) by choosing one of these stays close to Belfast International Airport:

  • 67.55% of flights that take off from Belfast International Airport make it to their destination on time.

George Best Belfast City Airport (BHD)

  • Consider adding a stop at London Heathrow Airport (LHR). It's a major stopover on a Belfast to Seattle flight leaving George Best Belfast City Airport. Use a longer layover to get out and explore, or take advantage of a short break to freshen up at the airport.

  • With public transport, you can travel from central Belfast to BHD in around 20 minutes. The terminal is roughly 5 kilometres away. Driving will take you about 10 minutes.

  • It's your holiday, so why not book an extra night away from home? Consider staying at one of these accommodation options near George Best Belfast City Airport the day before your flight from Belfast to Seattle:

  • When it comes to keeping flights on track, George Best Belfast City Airport has an on-time arrival rate of 68.3%.

Arriving in Seattle

Seattle-Tacoma International Airport (SEA)

  • The distance from Seattle-Tacoma International Airport (SEA) to central Seattle is approximately 18 kilometres. It takes about 20 minutes to reach the centre driving.

  • Getting there on public transport takes about 55 minutes.

  • Consider booking a hotel near SEA if you're coming in on a late flight from Belfast to Seattle. Select one of these options and skip the long transfer:

  • Grab a Seattle-Tacoma International Airport rental car and explore Seattle and beyond with your own set of wheels. Thrifty, Europcar and Budget are leading providers to choose from here.

  • To get the lowest price, book your vehicle from Seattle-Tacoma International Airport around one week ahead of your Belfast to Seattle flight.

Lake Union Sea Plane Base Airport (LKE)

  • Central Seattle is located around 3 kilometres from Lake Union Sea Plane Base Airport (LKE). Once your flight from Belfast to Seattle has hit the runway and you've made your way out of the airport, expect a drive of around 10 minutes.

  • If you hop on public transport, the journey will take you 25 minutes or so.

  • Place the 'Do not disturb' sign on your door and relax at a hotel close to LKE. Here are a few options where you can kick back after your flight from Belfast to Seattle:

Best time to go to Seattle

  • It's time to plan your travel dates for your flight from Belfast to Seattle. July is the busiest month to visit Seattle. If you like a quieter atmosphere, go in May.

  • Lock in a Belfast to Seattle ticket departing in August if you're eager to explore the city during its warmest month. Expect temperatures in Seattle to range from 12ºC (54ºF) to 28ºC (82ºF).

  • If you'd rather travel in cooler conditions, search for a cheap flight from Belfast to Seattle in February when temperatures average between -1ºC (30ºF) and 11ºC (52ºF).

More about Seattle

  • Start your Seattle trip off on the right foot by choosing the ideal place to stay. After booking your flight from Belfast to Seattle, browse our selection of hotels including:

  • There are so many things to explore in this city it can be hard to work out where to start. Greyhound: Bus Station, LMN Architects and Boeing Radiation Effects Lab are top sights which should be on any well-planned Seattle itinerary.

Explore more of United States

  • Seattle has plenty going for it, but there are so many other corners of United States just waiting to be explored. Around 241 kilometres south of Seattle, a visit to Portland will keep your itinerary packed. Don't miss top attractions like Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • If you're eager to discover another major stop in United States, consider Spokane, about 370 kilometres east of Seattle. Manito Park, Northwest Museum of Arts & Culture and Spokane Falls are key reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.