Cheap flights from Belfast to Seattle
Cheap return flights from Belfast to Seattle
Find the best deals
All prices shown are per person based on return flights only. Prices found in the last 48 hours.
Seattle flight facts
What you need to know
What are the cheapest airlines?
- Ryanair
- EasyJet
- Norwegian Air
These airlines usually offer the cheapest flights from Belfast to Seattle.
What airlines fly indirectly?
- British Airways
- KLM
- Lufthansa
These airlines fly from Belfast to Seattle, but you’ll have at least one layover.
How long is the flight?
12 hours 30 minutes
This is the shortest flight time from Belfast to Seattle.
Alternative flights from the UK to Seattle
Check out prices for other routes
Alternative flights from Belfast
You might find cheaper flights nearby
Today alone, Netflights has searched over five flights. 05 / Feb / 2026 is currently the lowest priced day of the year to fly the Belfast/Seattle route. There are around 35 flights on any given week from the UK to Seattle and the cheapest month to fly right now is February. Not suitable? Try running another search or viewing all cheap flight deals.
How to get cheap flights from Belfast to Seattle
Tips and advice from our flight experts
You've searched for flights from Belfast to Seattle. We've found 25 flights and compared them to give you the best offer. Ryanair is, on average, the cheapest for this route. Look out for them! The cheapest offer we've found is a one-way ticket for Belfast to Seattle on 13/06/2026 at 05:40 for £34.
We've scanned hundreds of airfares from dozens of airlines across the globe. We've found 10 airlines that operate the 7,500 km flight from Belfast to Seattle.
To find the best offers, consider booking 2-3 months in advance or looking for last-minute deals. Ryanair often has great prices for this route, and the average flight duration is about 12 hours 30 minutes. After selecting an offer, fill out your information and proceed to payment. Don't forget to check our flight + hotel service to book everything at once, saving you time and money!
Other popular destinations near Seattle
Where other people are flying to
