✈ SEA → HEL
9H 53M. SEATTLE TO HELSINKI. YOUR BACK WILL FILE A COMPLAINT.
Flight from Seattle to Helsinki
From Sea-Tac (SEA), USA North America → Vantaa (HEL), Finland Europe
How long is the flight from Seattle to Helsinki?
A nonstop flight from Seattle (SEA) to Helsinki (HEL) takes about 9 hours 53 minutes, covering a great-circle distance of 4,768 miles (7,673 km). Actual scheduled time varies by airline, routing, and wind — expect ±15 to 30 minutes from this estimate.
Avg flight time
9h 53m
Nonstop, scheduled
Distance
4,768 mi
7,673 km · great-circle
Avg speed
776 km/h
Door-to-door including taxi
Time zones & jet lag
Seattle timezone
UTC-7
America/Los_Angeles
Helsinki timezone
UTC+3
Europe/Helsinki
Time difference
+10h
10 hours ahead
Jet lag (rough)
~10d
Eastward — worse
CO₂ footprint per passenger
Economy class, single passenger. Source: DEFRA 2024 averages.
This flight emits roughly 3.6× the CO₂ of an equivalent train trip and 0.9× a car driven alone over the same distance.