How long does it take to travel from osan afb to seattle
It depends on how many stops you have. Are you flying MAC or commercial ? When I flew back to the US it took 9 hours into LA. If your going to the northwest you will probably layover in Hawaii.
The total time it would take on a airplane to travel from OSAN Air Force Base in South Korea to Seattle, Washington is 10 hours with no stops flying with Asiana Airlines.