Cheap Flights from Seattle to Belfast

Compare Seattle to Belfast flight deals

Find the cheapest month or even day of the year to fly to Belfast

Book the best Belfast fare with no extra fees

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 Rs226,582. 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 November.

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 foundRs58,283
Cheapest month to flyNovember

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 Rs210,602. 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 Rs210,602.
As of August 2026, there are no flights flying from Seattle to Belfast.
The cheapest month to fly from Seattle to Belfast is usually August.
If you're flying from Seattle, the cheapest airport near Belfast is Belfast International – which is 19.7 km away from the centre of Belfast. We've found flights into this airport from Rs210,602.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Belfast on Friday, 28 August 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 August, the average temperature is usually around 14°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 .

Travelling from Seattle to Belfast: what you need to know

  • Seattle is home to a couple of airports that could be the jumping-off point for your adventure. Explore your options for booking a flight from Seattle to Belfast flying out of Seattle / Tacoma International Airport (SEA) or Seattle Lake Union SPB Airport (LKE).

  • When working out where to arrive in Belfast, Belfast International Airport (BFS) and Belfast City Airport (BHD) are the primary gateways.

  • Belfast is eight hours ahead of Seattle and observes the UTC+0 timezone.

  • Give yourself plenty of time to get on your Seattle to Belfast flight. As a rule of thumb, arrive two hours before international departures and an hour ahead for domestic flights.

  • Travelling during a peak month such as July? School holidays and other popular periods can mean longer lines at security. Play things extra safe and get there up to four hours before an international flight and two hours before domestic departures.

How to find the cheapest flights from Seattle to Belfast

  • Booking early is often the key to locking in a cheap Seattle to Belfast flight. Prices tend to rise as demand increases, so the closer you get to departure, the more you'll likely pay.

  • Finding cheap plane tickets from Seattle to Belfast is easier if you can be flexible with your travel plans. Use the 'Whole month' tool to see the lowest prices throughout the month and bag an incredible deal.

  • Stay on top of deals for cheap flights from Seattle to Belfast by setting up a Price Alert. We'll send you an email or notification on the app when a lower fare pops up.

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

Flying from Seattle

Seattle / Tacoma International Airport (SEA)

  • Consider adding a stopover to potentially save on your Seattle to Belfast flight. Just deselect 'Direct flights only' when browsing departures from Seattle / Tacoma International Airport. Break up your trip (and maybe save some cash) by stopping at one of these airports:

    • London Heathrow Airport (LHR)

    • Amsterdam Schiphol Airport (AMS)

    • Frankfurt am Main Airport (FRA)

  • The journey from central Seattle to SEA takes around 35 minutes on public transport. If you ride-share, drive or take a taxi, you'll cover the 19 kilometres in 25 minutes or so, depending on traffic conditions.

  • After a hassle-free start to your journey? Stay near Seattle / Tacoma International Airport. Whether you're boarding an early flight from Seattle to Belfast or want to avoid feeling rushed, these hotels are ideal:

  • Seattle / Tacoma International Airport maintains a strong on-time record, reducing your chances of a delayed flight. Departures from SEA arrive on schedule 80% of the time.

Arriving in Belfast

Belfast International Airport (BFS)

  • Belfast International Airport (BFS) is approximately 19 kilometres from central Belfast. If you're catching a taxi or a ride-share, the drive takes roughly 25 minutes.

  • Travelling to the centre by public transport will take you roughly 45 minutes.

  • The last thing you want is a long journey to your hotel if you're getting in late on a flight from Seattle to Belfast. Reserve one of these accommodation options near BFS instead:

  • Pick up a Belfast International Airport rental car and discover Belfast and beyond with your own set of wheels. Budget, Drivalia and Dollar are top outlets to choose from here.

  • Lock in the lowest price by booking your vehicle from Belfast International Airport around three weeks before your departure date.

Belfast City Airport (BHD)

  • Belfast City Airport (BHD) is around 5 kilometres from central Belfast. After your flight from Seattle to Belfast, it'll take you approximately 15 minutes to reach the heart of the city in a ride-share or taxi.

  • You can expect the journey to take roughly 25 minutes on public transport.

  • After your flight from Seattle to Belfast, unwind at a hotel close to BHD. These are some comfortable options that'll help you slip into relaxation mode:

  • Forget about public transport schedules or taxi lines. Pick up a Belfast City Airport rental car and take your journey in whatever direction you like. Check out the availability and rates from Budget, Sixt and Alamo.

  • Avoid paying more than you need to. Securing your ride two weeks ahead of your arrival at BHD can help you lock in a better rate.

Best time to go to Belfast

  • It's time to pick your travel dates for your flight from Seattle to Belfast. September is the busiest month to visit Belfast. If you like a more relaxed vibe, go in February.

  • Before locking in your Seattle to Belfast tickets, think about what kind of weather you prefer. July is the warmest month in Belfast, with temperatures ranging from 9ºC to 19ºC.

  • January has average temperatures of between 1ºC and 8ºC. Search for cheap flights from Seattle to Belfast around that time if you like travelling in cooler conditions.

More about Belfast

  • When it comes to searching for somewhere to rest your head, you'll find the best stays in Belfast right here. Check out these hotels as soon as you've booked your flight from Seattle to Belfast:

  • There are so many things to do and see in this city it can be tricky to work out where to start. Titanic Belfast, St Anne’s Cathedral, Belfast and Grand Opera House are top attractions which should feature on any well-planned Belfast itinerary.

Explore more of the United Kingdom

  • Manchester is just one of the many places in the United Kingdom waiting to be discovered once you've seen the sights of Belfast. Around 274 kilometres to the southeast, its top attractions include Manchester United Museum & Stadium Tour, The Homes of Football and Science and Industry Museum.

  • Around 354 kilometres southeast of Belfast, Birmingham is another favourite stop in the United Kingdom. Experience major highlights starting with Birmingham Museum & Art Gallery, Birmingham Hippodrome and Bournville Experience.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.