Air distance from Seattle, USA to Cayenne, French Guiana is 5056.2 Miles (8137.2 Kilometers / 4390.8 Nautical Miles).
10 hrs, 29 mins is the flight duration between Seattle and Cayenne. 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.