Seoul does not charge per journey. It charges for distance traveled, counted across every subway line and every bus a single T-money card touches in one continuous trip, with the first stretch covered by a flat base fare and every kilometre after that added on in fixed increments. A subway-to-bus-to-subway trip that stays inside the transfer window is billed as one distance, not three fares.
One fare, measured in kilometres
The mechanism is simple even where the numbers are not: a base fare buys a fixed distance — currently the first 10 km — and then the system keeps counting. Cross that first threshold and a surcharge is added in regular steps, not continuously, so the fare rises in a staircase rather than a smooth ramp. The exact size of each step and the current base fare are set by the Seoul Metropolitan Government and the operators and are published by Seoul Metro and by T-money‘s own fare pages — both should be checked before travel, because this is exactly the kind of figure that moves without much notice. For how the card itself is bought and loaded, see How T-money Works: Buying, Topping Up, Tapping Out.
The shape of the staircase, as published by the operators, looks roughly like this — figures to confirm on the day, structure stable for years:
- Up to 10 km: covered by the base fare. No distance surcharge yet.
- 10–50 km: a fixed increment is added for each additional band of distance — published by Seoul Metro as roughly 100 won per 5 km — stacking step by step as the trip gets longer.
- Beyond 50 km: the increment steps change to a wider band, around every 8 km, which is why a single very long cross-city run (say, out towards the edges of Gyeonggi-do on an extended line) costs more per kilometre traveled early in the band than later in it.
This is a nationwide-style structure rather than a Seoul quirk — Korea’s metropolitan transit fares are generally built this way — but the base fare, the increment size and the 10 km/50 km breakpoints are all numbers that have changed before and will change again; the operator’s own tariff page, not this article, is the source to trust on the day of travel.
The transfer window: 30 minutes, 60 after dark
A transfer is free — meaning the whole multi-leg trip is billed as one continuous distance rather than as separate fares — only inside a time window that starts counting the moment the card is tapped out of the first leg. Seoul Metro and T-money publish this window as 30 minutes between taps for most of the day, extended to roughly 60 minutes late at night (commonly cited from around 9pm), recognising that services run less frequently after dark and a connection takes longer to make. Miss the window and the next tap-in is charged as a fresh trip with its own new base fare, even if the whole journey was always going to be one continuous route across the city.
Up to four transfers are typically allowed within one fare sequence, across any combination of subway lines and buses, provided every tap happens inside the window and every tap-out actually registers — which is the part visitors most often get wrong.
Tap out, or pay for the whole line
The subway makes tapping out unavoidable — there is a gate at the other end. The bus does not. Seoul’s city and intercity buses carry a second reader by the rear or side doors specifically so the distance count can close correctly, and it is optional in the sense that nothing physically stops a passenger walking off without using it. The consequence is not a vague penalty: fail to tap out on a bus and the system, unable to see where the journey actually ended, defaults to charging the maximum fare for that entire route — the fare as if the passenger had ridden to the terminus — deducted automatically the next time the card is used. The free transfer for that leg is also void, because the system has no tap-out timestamp to measure a window from. This single step — reader by the door, card against it, on the way out — is the most common way visitors overpay in Seoul, and it is worth building into the itinerary like checking a departure board.
What this adds up to over a week or a year
For a short-stay visitor doing mostly short hops between a hotel, a palace and a market, the distance bands rarely matter — most inner-city journeys sit inside or just past the base-fare threshold. The structure starts to matter on longer runs: out to Incheon, across to the far side of the Han River network, or onto one of the longer suburban lines that cross into Gyeonggi-do. A resident commuting the same long route daily feels the increment bands directly in a monthly card-load pattern, which is one reason T-money also sells capped monthly passes for heavy commuters — a separate product from the pay-as-you-go distance fare and worth comparing against actual travel patterns rather than assumed from a visitor’s week.
None of this is specific to the subway. The same distance count, the same transfer window and the same tap-out rule apply to the city bus network, which is why the two are described as one integrated fare system rather than two separate ones that happen to share a card.
Where this fits with the rest of getting around
The distance fare only works if the card itself is funded and functioning — how to buy and top up T-money is covered separately, and it is worth sorting before the first gate rather than at it: How T-money Works. The other deadline that interacts with all of this is the last train, which stops around midnight but varies by line and direction and is never the same minute twice — see The Last Train in Seoul: Working Out Your Real Cutoff. Navigation apps built outside Korea generally cannot route Seoul’s transit correctly at all, which matters more than the fare math on an actual journey — Google Maps Doesn’t Work Properly in Korea — Use This covers what to use instead. Station layouts bring their own logic once the fare is paid, explained in Seoul Subway Exit Numbers Explained, and the airport leg runs on a related but distinct fare structure of its own, set out in AREX Express or All-Stop: Which Airport Train to Take. More on how the wider system fits together is in the Getting Around archive.
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