Can I leave Incheon International on a layover?
You don’t mention how long your layover is… If “time isn’t really an issue” then yes, you do have enough time. Customs is not that difficult or long in ICN. I’ve flown out several times and it’s never taken me more than 20 minutes (YMMV). Going through customs on the way in might take a little longer but that is all dependent on how many planes land at the same time as you. If you have only carry-ons, this will vastly facilitate your exit and entry. Yes, boarding pass coupled with passport is plenty to get through security. The area around ICN, however, sucks and isn’t really worth seeing that much. It takes about an hour to get into Seoul. If you have more than a 6 hour layover then I think you can get into Seoul, walk around a bit, eat some delicious stuff, and then still be okay with the plane.
