C$437 Cheap Flights from Seattle (SEAA) to Belfast (BELF)

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Flight deals from Seattle to Belfast

Looking for a cheap last-minute deal or the best return flight from Seattle to Belfast? If you want to travel next month, return fares start from C$1,238. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle to Belfast

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

Alternative Seattle to Belfast routes

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

Seattle to Belfast: Flight information

The things to know before you go.
Cheapest flight foundC$437
Cheapest month to flyMay

Finding cheap flights from Seattle to Belfast: Frequently asked questions

There are 2 airports in Belfast: Belfast City and Belfast International.
The best price we found for a return flight from Seattle to Belfast is C$1,238. 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 Seattle to Belfast. But we found flights with one or more stops from C$1,238.
As of April 2026, there are no flights flying from Seattle to Belfast.
The cheapest month to fly from Seattle to Belfast is usually May.
If you're flying from Seattle, the cheapest airport near Belfast is Belfast International – which is 19.6 km away from the centre of Belfast. We've found flights into this airport from C$1,238.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Belfast on Thursday, May 21, 2026.
No airlines currently offer direct flights between Seattle and Belfast. 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 Belfast 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 Belfast 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 Belfast, when it usually averages around 17°C. You can expect the least rain in May. The coldest month is January, with temperatures averaging 4°C. The rainiest month is October.
The cheapest airline that flies to Belfast is Icelandair .

Flying from Seattle to Belfast: what you need to know

  • Start your vacation planning by considering where you'll catch your flight from Seattle to Belfast. Seattle-Tacoma International Airport (SEA) and Lake Union Sea Plane Base (LKE) are the two main airports in Seattle.

  • Touch down in Belfast at Belfast International Airport (BFS) or George Best Belfast City Airport (BHD).

  • To ensure you get on your flight from Seattle to Belfast, leave enough time for things like baggage drop and finding your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the general rule.

  • You'll likely experience longer queues during popular months like July and other peak seasons. Arriving up to four hours ahead of an international flight and two hours for domestic departures is a smart move.

  • You won't need a visa for United Kingdom if you have a passport from United States and are visiting for tourism purposes. Visa and travel documentation requirements can change. So before booking your cheap flights from Seattle to Belfast, be sure to check with your airline and your destination country's local embassy or consulate for the latest information.

Flying from Seattle

Seattle-Tacoma International Airport (SEA)

  • We make it simple to find a flight from Seattle to Belfast that includes a stopover. To see all your options departing from Seattle-Tacoma International Airport, deselect 'Direct flights only.' Then, simply select a flight that has a stop long enough to tour the city of your choice. Major stopovers include:

    • London Heathrow Airport (LHR)

    • Amsterdam Airport Schiphol Airport (AMS)

    • Frankfurt Airport (FRA)

  • SEA is about 23 kilometres from central Seattle. If you're ride-sharing, catching a cab or driving from the centre, it'll take 18 minutes or so to get there, depending on traffic. If you're using public transport, expect the trip time to be around 54 minutes.

  • Want an easy start to your break? Stay near Seattle-Tacoma International Airport. Whether you're taking an early flight from Seattle to Belfast or just don't like being rushed, these hotels are just the thing:

Lake Union Sea Plane Base Airport (LKE)

  • Break up your flight from Seattle to Belfast with a stop so you can freshen up or perhaps go somewhere you've never been before. Some top stopovers between Seattle-Tacoma International Airport and Belfast are:

    • London Heathrow Airport (LHR)

    • Amsterdam Airport Schiphol Airport (AMS)

    • Frankfurt Airport (FRA)

  • With public transport, you can travel from central Seattle to LKE in around 23 minutes. The airport is roughly 3 kilometres away, and making the trip by car takes approximately 11 minutes.

  • Want to treat yourself to an extra night away before catching your flight from Seattle to Belfast? Relax in a hotel near Lake Union Sea Plane Base Airport before your break officially starts. Here's where you can stay:

Arriving in Belfast

Belfast International Airport (BFS)

  • Belfast International Airport (BFS) is around 32 kilometres from central Belfast. With a car rental or if you're catching a cab, the drive is around 31 minutes.

  • If you're using public transport, expect a journey time of roughly 2 hours and 2 minutes.

  • Reserve a hotel close to BFS if you're catching a late flight from Seattle to Belfast. Select one of these accommodation options and avoid the hassle of a long transfer:

George Best Belfast City Airport (BHD)

How to find the cheapest flights from Seattle to Belfast

  • Right now, C$437 is the best price we've found for a one-way ticket from Seattle to Belfast. The cheapest price for a return flight is C$1,238. Remember fares can change due to demand at the time of booking.

  • Don't wait until the last minute. You're more likely to get cheap flights from Seattle to Belfast if you book ahead. Airlines often have some fantastic early bird discounts.

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

  • Set up a Price Alert for cheap flights from Seattle to Belfast. There's no need to look every day to see if prices have dropped. We'll update you as soon as the price changes.

  • Use filters to tailor your flights from Seattle to Belfast. Pick your preferred arrival and departure times, number of stops and airlines. Or sort your results by 'Cheapest' to find the best deals.

Best time to go to Belfast

  • February is the quietest month for flights from Seattle to Belfast, while August is the most popular. Work out the best time to visit Belfast based on whether you like a bustling atmosphere or a more laid-back vibe.

  • When booking your flight from Seattle to Belfast, consider the kind of weather you like. July is the warmest month in Belfast, with the temperature ranging from 10ºC to 19ºC.

  • For cooler conditions, look for a cheap ticket from Seattle to Belfast in January when temperatures average between 1ºC and 8ºC.

More about Belfast

  • After booking your flight from Seattle to Belfast, think about where you'd like to stay in this city. Make one of these options your base for exploring Belfast:

  • Titanic Belfast and Crumlin Road Gaol Visitor Attraction and Conference Centre are just the start of the leading attractions to add to your Belfast to-do list. Keep the sightseeing going at Botanic Gardens.

Complete your Belfast trip with a car rental

  • Finding you a cheap flight from Seattle to Belfast isn't the only trick up our sleeve. Check out our car rentals in Belfast and explore on your own terms. We find deals from trusted car rental providers and put them all in one place. You can instantly compare rates and then book with no fees.

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