Checking luggage on Korean Air at Seoul (train) Station

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Access to the airport train from Seoul Station is to the left of Entrance/Exit 3 in this photo

Korean Air offers a very convenient service (unavailable for code-share flights): You can check-in and check your luggage at Seoul Station before taking an express train to the airport. To do this, you need to arrive 3 hours before your flight. (This isn’t really a big deal since they ask you to arrive at the airport 2 hours early if you’re going to check luggage there, and the direct train from Seoul Station is about 45 minutes.)

The process at Seoul Station is as follows:
1. Arrive 3 hours early. (The location is by Entrance/Exit 3 of Seoul Station, down two floors via escalator and/or elevator.)
2. Buy a train ticket to the airport (either at a machine if you have cash or a local credit card, or at the office just by the machines–to your left as you face the machines–with a foreign credit/debit card). You MUST buy the train ticket first. You’ll need to show it at check-in. Choose a time at least 30 minutes in the future for your train ticket to allow time for check-in and immigration. If you should miss that train departure time, you can exchange your ticket for a later time at the office.
3. Check-in and check your luggage at the Korean Air check-in desk just as you would at the airport.
4. Go to immigration. This is located at a small office just beside the ticket office, at the entrance to the check-in desks. The process was very quick.
5. Take the elevator a short distance away to the train platform. The train is clean, comfortable, air conditioned and (like so many public places in Korea) offers free wi-fi.

At the airport, you take a special entrance, along with diplomats and crew, for those who have already passed through immigration. (There’s a convenient photo of this entrance taped to the Korean Air check-in desk.) Follow the signs to this “Designated Entrance” which was to our right just past a cell phone service shop as we exited airport security.

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Photos of entry points at airport taped to Korean Air check-in desk at Seoul Station

The system worked like a charm for us and our luggage was first off the plane when we arrived in Shanghai.