Air distance from Seattle, USA to Hangzhou, China is 5832.7 Miles (9386.9 Kilometers / 5065.1 Nautical Miles).
Flight duration time from Seattle to Hangzhou is 12 hrs, 6 mins. 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.