After completing a trip to Cambodia and Vietnam we will making a stopover in South Korea. Our flight already goes through Seoul so we are staying for 2 days before heading home. Our friends son in stationed in Osan AB and I am wondering what would be the best way to get there and back. Our flight lands in Seoul (incheon) at 6:40 am on a tuesday and leaves at 11:40am on Thursday. We didn't know if we would have time for a short tour of Seoul before heading to the AB. Any advice would be appreciated.