$389 Find Cheap Flights from Seattle to Belfast Intl Airport - Compare and Save

In the last 5 days, the lowest price for a flight from Seattle to Belfast Intl Airport was $389 for a one-way ticket and $914 for a round-trip.

Yes, you’ll need a passport to travel to Belfast Intl Airport from Seattle.

We unfortunately don’t have that data for this specific route.

oneworld is the only airline alliance operating flights between Seattle and Belfast Intl Airport.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Belfast Intl Airport.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Belfast Intl Airport from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Belfast Intl Airport with an airline and back to Seattle with another airline. Booking your flights between Seattle and BFS can sometimes prove cheaper using this method.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Belfast Intl Airport from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.