The subway system in Seoul includes 21 rapid transit lines. Each line has its own name, number and color: 1 (dark-blue), 2 (green), 3 (orange), 4 (blue), 5 (violet), 6 (brown), 7 (khaki), 8 (pink), 9 (beige), AREX (blue), Gyeongui-Jungang (turquoise), Gyeongchun (turquoise), Bundang (yellow), Suin (dark-yellow), Shinbundang (red), Incheon (cornflower blue), Incheon 2 (pumpkin), EverLine (lime), U (orange), Ui (light-green) and Gyeonggang (blue). There are 453 subway stations. Overall length totals to 422,7 km. Working hours: 5.30 AM – 1 AM. Weekends: 5.30 AM – Midnight.
The fare depends on the length of the ride. Fares are currently 1,250 KRW for a trip up to 10 km, with 100 KRW added for each subsequent 5 km. Once 40 km has been passed, 100 KRW are added every 10 km. Single-use ticket users must pay 500 KRW extra (it is a deposit) and this sum is refunded at Deposit Refund Machines after the ride is over. Cumulative Tmoney cards that cost 3000 KRW (5000 KRW for the keychain-like ones) could be used to cut travel expenses. The card could be charged with 90,000 KRW. It offers free transfers and is valid for all means of public transportation in South Korea. The fare for the ride is calculated at the end of the trip.
Tickets and cards may be purchased at TVMs dotted at every station. They accept credit cards, notes and coins. Passing through the faregate you have to insert the ticket into the reader or swipe the card over it. Please, keep it throughout the ride as it has to be validated at the end of the trip. In case you want to get off at the wrong station, the faregate would be closed.