You can use the T-money card for the AREX. For the commuter train, you can just use it DIRECTLY. There are fare gates...just hold your card to the card reader.
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A one-way AREX train ticket costs ?9,000 or $7.15, but you can book on Klook here for only ?7,400 or $5.9. How does the AREX train map look like? It's pretty straightforward. The Express Train only has 3 stops: Incheon Airport Terminal 1, Terminal 2, & Seoul Station.
Skip the long queues at the airport and book your AREX tickets in advance online. Simply redeem your tickets by scanning your QR code and enjoy a hassle-free transaction.
KOREA TOUR CARDMust-Have Item for Korea TravelAs transportation and travel card exclusively for foreign visitors, KOREA TOUR CARD enables more convenient access to the means of the Korean transportation such as subways, buses, and taxies.
Credit cards, debit cards, and cash are all accepted without issue in South Korea, with cash becoming less common. According to the Bank of Korea, only about 20% of financial transactions in Korea are made with cash.
Visa and MasterCard are the most widely accepted types, with some high-end hotels and restaurants accepting American Express. For smaller restaurants, outdoor markets, and bus fare, cash is necessary. However, don't carry excessive amounts of cash.
3. Go City® Seoul All-Inclusive Pass. Now if you want to get the most out of your money, the Go City Seoul All-Inclusive Pass is your best bet! This tourist card not only comes with admission to the best attractions in the Korean capital, but you also get transportation perks and even an 14-day SIM card.