Cheap Flights from Seattle / Tacoma International Airport to Northern Ireland from $870 Roundtrip

Flight deals from Seattle / Tacoma International Airport to Northern Ireland

Looking for a cheap last-minute deal or the best roundtrip flight from Seattle / Tacoma International Airport to Northern Ireland? If you want to travel next month, roundtrip fares start from $899. Find the lowest prices on one-way and roundtrip tickets right here.

Belfast.$870 per passenger.Departing Sun, Nov 15, returning Sat, Dec 5.Round-trip flight with Icelandair and Ryanair.Outbound indirect flight with Icelandair, departing from Seattle / Tacoma International on Sun, Nov 15, arriving in Belfast International.Inbound indirect flight with Ryanair, departing from Belfast International on Sat, Dec 5, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $870, select.

Show more deals

Flying from Seattle / Tacoma International Airport to Northern Ireland

Arm yourself with these facts on the fly.

Cheapest flight found	$870
Cheapest month to fly	November

How to find cheap flights from Seattle / Tacoma International Airport to Northern Ireland

We've compared the best online travel agents and flight providers on the internet to find the cheapest plane tickets from Seattle / Tacoma International Airport to Northern Ireland. Other savvy travelers recently found round-trip flights from $870 and one-way tickets from $323. Ready to join them? Here are a few tips to help you do it the smart way.

Fly in November

The cheapest time to fly from Seattle / Tacoma International Airport to Northern Ireland is currently November.

Flex your dates for the best rates

If you’re flexible on your departure dates, you can use Skyscanner's whole month tool to find the cheapest day of the year to fly from Seattle / Tacoma International Airport to anywhere you choose in Northern Ireland.

Watch as flight prices go up and down

With Price Alerts, we'll let you know when flight prices from Seattle / Tacoma International Airport to your chosen airport in Northern Ireland go up or down so you can book when the time is just right.

Relax – these are fee-free plane tickets

With us, there are no added fees – the Northern Ireland Airport to Northern Ireland flight price you see when you search with us is what you pay to the provider.

Frequently asked questions

Are there any direct flights from Seattle / Tacoma International Airport to Northern Ireland?

There are currently no direct flights from Seattle / Tacoma International Airport to Northern Ireland, but we've found some other routes to United Kingdom – check them out now.

What is the average price of a flight from Seattle / Tacoma International Airport to Northern Ireland?

We looked at all of the upcoming round-trip flights from Seattle / Tacoma International Airport to Northern Ireland we could find over the next 12 months. It looks like $870 is the best price. This is good, compared to the average Northern Ireland ticket price of $870.

What is the cheapest month to fly from Seattle / Tacoma International Airport to Northern Ireland?

The cheapest month to fly from Seattle / Tacoma International Airport to Northern Ireland is currently November.

On which upcoming date is it cheapest to fly from Seattle / Tacoma International Airport to Northern Ireland?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle / Tacoma International Airport to Northern Ireland on Sunday, November 15, 2026.

If I'm flying from Seattle / Tacoma International Airport, where in Northern Ireland is cheapest to fly to?

If you're flying from Seattle / Tacoma International, the cheapest city in Northern Ireland to fly into is Belfast. The cheapest airport serving Belfast at the moment is Belfast International.