Distance From Slemish Airfield to Seattle–Tacoma International Airport

The distance from Slemish Airfield () to Seattle–Tacoma International Airport (SEA) is 4454 miles or 7167 kilometers or 3868 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Buckna (Co Antrim) ( United Kingdom ) to Seattle ( United States )?

A one-way nonstop (direct) flight between Buckna (Co Antrim) and Seattle takes around 10 hours 14 minutes.

Estimated flight time from Slemish Airfield, Buckna (Co Antrim), United Kingdom to Seattle–Tacoma International Airport, Seattle, United States is 10 hours 14 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • - SEA

Kilometers		7167 km
Statute Miles		4454 miles
Nautical Miles		3868 nm
Avg. Time of Flight		10 hours 14 minutes

Slemish Airfield to Seattle–Tacoma International Airport Flight Route Map - to SEA Flight Path

Location of Slemish Airfield & Seattle–Tacoma International Airport is given below.
Click the map to view Buckna (Co Antrim) to Seattle nonstop flight path and travel direction.

Click to see flight route on Google Map between Buckna (Co Antrim), United Kingdom and Seattle, United States. .

Nonstop flight route between Buckna (Co Antrim), United Kingdom and Seattle, United States.

Time Difference Between the Airports • - SEA

Time difference between Buckna (Co Antrim) (United Kingdom) and Seattle (United States) is 6 Hours.
Seattle time is 6 Hours behind Buckna (Co Antrim).

Location	Local Time
Buckna (Co Antrim) (United Kingdom)	2026-03-19, 11:22:09 GMT
Seattle (United States)	2026-03-19, 05:22:09 MDT

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Slemish Airfield ( / ) Buckna (Co Antrim), United Kingdom

Destination

Seattle–Tacoma International Airport (SEA / KSEA) Seattle, United States