We usually point first-time visitors to the limousine bus, but AREX is the better call for a specific kind of trip: light luggage, a hotel near a subway station, and a preference for fixed schedules over traffic. Here's how the train actually works.

Express or all-stop — two different trains

AREX runs two services on the same line: the Express train, which goes straight from the airport to Seoul Station with no stops, and the All-stop train, which is really a commuter line that happens to pass through the airport. They're not interchangeable — pick based on your luggage and your budget.

Fares and journey time

• Express train — nonstop to Seoul Station in about 43 minutes from Terminal 1, or about 51 minutes from Terminal 2. Adult fare is ₩13,000; AREX's own online booking runs about ₩12,500 for members, so don't expect a steep discount — bigger markdowns elsewhere are third-party resellers, not the standard fare.
• All-stop train — the budget option: ₩4,750 from Terminal 1, ₩5,350 from Terminal 2, taking roughly 59–67 minutes depending on which terminal you start from.
• Both trains start from the same underground station beneath the airport terminals, so the walk to the platform is the same either way.
• The all-stop train works with T-money — tap in like the subway. The Express train uses a separate reserved ticket, not T-money.

Buying a ticket

• Follow signs for "AREX" or "공항철도" down to the basement level of the terminal — both T1 and T2 connect to the line, with a free shuttle between terminals if you land at the wrong one.
• Ticket machines take foreign cards and have an English interface; there's usually a staffed counter nearby too if you'd rather not deal with a machine after a long flight.
• Express train seats are assigned, so buy before you go down to the platform. All-stop is just a normal T-money tap — no ticket needed if your card has enough balance.

When it beats the bus, and when it doesn't

• Take the train if: your hotel is at or near Seoul Station, or right on a subway line, and you're not hauling multiple large suitcases.
• Take the bus if: your hotel is a specific neighborhood stop without a convenient subway connection, you have a lot of luggage, or you land late at night — AREX doesn't run 24 hours.
• Traffic doesn't touch the train's schedule, which matters if you're arriving at rush hour.

From Seoul Station, you're on the subway network (Line 1, Line 4) and the KTX for onward domestic travel, so factor in one more short ride if your hotel isn't within walking distance of the station.