Air distance from Seattle, USA to Nukualofa, Tonga is 5755.9 Miles (9263.2 Kilometers / 4998.4 Nautical Miles).
11 hrs, 57 mins is the flight duration between Seattle and Nukualofa. This is the In-The-Air flight time. You should also add the taxi time, airport wait times and possible delays due to bad weather, etc. for the total flight duration time.