Korea Transit Guide 2026 — T-money, Climate Card, AREX, Free Transfers Explained
Korea's public transit runs on a single rechargeable contactless card called T-money — buy one for ₩2,500 at any convenience store, load it with cash or an international Visa, and tap on every subway gate, city bus, and taxi nationwide. The base subway fare in Seoul has been ₩1,550 (T-money) / ₩1,650 (cash) since June 2025, but distance surcharges, free transfers, and the new Climate Card 30-day pass make the actual cost wildly variable. This guide walks through the cards (T-money vs Climate vs cash), the fare math (base + distance + transfers), AREX airport access, and the surprisingly common questions about age discounts and leftover-balance refunds that catch foreigners off guard.
🚇 Calculate exact fare 📦 Customs duty calculator
1. The Korean transit card ecosystem in 2026
Three options for paying transit fares in Korea — pick by trip length and stay duration.
| Card | Best for | Cost | Recharge |
|---|---|---|---|
| T-money | Long-term residents, occasional travelers | ₩2,500-4,000 empty card + load any amount | CU / GS25 (cash, intl card OK) + station machines (cash) |
| Climate Card 30-day | Daily Seoul commuters (5+ trips/week) | ₩62,000 Basic / ₩65,000 Combined | Auto-include unlimited trips for 30 days |
| Climate Card short-term | Tourists doing heavy sightseeing | ₩5,000 (1-day) ~ ₩22,000 (7-day) | Single pre-paid load, intl card OK at airport kiosks since Mar 2025 |
| Cash | Emergency only | ₩1,650 base fare (₩100 surcharge vs T-money) + no transfers | — |
For most foreign residents on ARC, plain T-money is the right answer — pay only what you use, no commitment. Switch to Climate Card 30-day once you confirm 30+ monthly trips on Seoul lines. Tourists doing 4+ sightseeing days should compare a 5-day Climate Card vs estimated T-money cost.
2. The fare math — base + distance + transfers
Seoul (and most Korean metros) charge fares using a three-part formula:
- Base fare: ₩1,550 adult / ₩900 youth (13-18) / ₩550 child (6-12) with T-money. ₩1,650 with cash.
- Distance surcharge: After 10 km, +₩100 per additional 5 km (Seoul). After 50 km, +₩100 per 8 km.
- Free transfer credit: Subway-to-bus / bus-to-bus / bus-to-subway counted as ONE trip (pay only the higher base fare + combined distance). Requires T-money or Climate Card, valid 30 min (60 min during 21:00-07:00), max 4 transfers.
Example — Hongik University (Line 2) → Gangnam (Line 2), 8 km direct: ₩1,550 adult on T-money. Hongik → Gangnam via Line 2 transfer to bus 360 (total 13 km): still ₩1,550 + ₩100 distance = ₩1,650 because of the free-transfer rule. Same trip paying cash on subway then cash on bus: ₩1,650 + ₩1,500 = ₩3,150. Always use a card.
For multi-leg journeys with multiple stops or different city zones, use the Seoul Subway & Bus Fare Calculator to get the exact T-money charge in seconds.
3. Buying and registering your card
3.1 Where to buy
- Convenience stores (CU, GS25, 7-Eleven, Emart24) — most common, ₩2,500-4,000 empty card, English-speaking clerks rare but the transaction is simple (point + 카드 주세요)
- Subway station vending machines — English UI, ₩2,500-3,000, occasionally sold out
- Incheon Airport arrival hall — kiosks sell pre-loaded cards (₩5,000-20,000), Climate Card short-term passes since Mar 2025
- Online (advance) — Klook, KKday, Visit Korea sell pre-loaded cards for airport pickup
3.2 Age category registration (youth/child only)
Default unregistered cards always charge adult rate. To get youth (₩900) or child (₩550) discounts on every tap:
- Bring card + passport (or ARC) to a CU or GS25 clerk
- Ask: "어린이 등록해 주세요" (child registration) or "청소년 등록해 주세요" (youth registration)
- Clerk verifies the age from your document and registers via the in-store T-money terminal
- One-time setup, locked to that card permanently. Buy a new card if you outgrow the category (rare for foreigners).
3.3 Recharge methods
- Cash — everywhere with a T-money logo. Minimum ₩1,000, max balance ₩500,000.
- International credit card — CU, GS25, Emart24 accept Visa/MC/JCB issued anywhere. Climate Card kiosks at Seoul stations also accept international cards (rolled out 2024-2025).
- T-money mobile app — requires Korean phone number + Korean-bank-issued card. Most foreign residents can't use this.
- Subway station machines — historically cash-only. Some upgraded machines accept Korean credit cards (not international yet, as of 2026-05).
4. Free transfer rules — getting the discount
The Seoul "free transfer" system is technically "pay the difference," not free. Rules in detail:
- Tap on entry AND exit: every leg. Missing the exit tap → max distance fare + you lose the transfer chain.
- Time limit: 30 min between taps (60 min during 21:00-07:00). Counted from exit-tap of previous leg to entry-tap of next.
- Maximum 4 transfers per trip. 5 legs total.
- Same-line transfers don't count: Line 2 → Line 2 is one trip, not a transfer.
- Bus-to-bus on the same route number doesn't count as a transfer: getting off and back on the same line within 30 min charges you again.
- Distance is cumulative: a subway 8 km + transferring to bus 5 km = 13 km total. You pay base fare once + distance surcharge for the 3 km over 10 km.
Common mistake: foreigners often pay cash for the bus because they're more familiar with handing over coins. This forfeits the transfer discount entirely. Always tap with T-money or Climate Card.
5. AREX — airport access from Incheon
Two completely different services run on the AREX line, with very different prices.
| Option | Time | Cost | Pros | Cons |
|---|---|---|---|---|
| All-Stop (commuter) | ~58 min | ~₩4,750 with T-money to Seoul Station | Integrated with metro free transfer; cheapest | Standing room only at peak; ~15 min slower |
| AREX Express | ~43 min | ₩13,000 (₩11,400 online) | Reserved seat, luggage racks, nonstop | ~2.4× the price; doesn't transfer-discount to other lines |
| Airport limousine bus | ~70-90 min | ₩15,000-17,000 | Direct to many hotel zones | Slowest, traffic-dependent, hardest English navigation |
| Taxi | ~60-75 min | ₩70,000-100,000+ | Door-to-door | ~15× the All-Stop price; traffic risk |
Decision guide: backpack + flexible schedule → All-Stop. Heavy bags + post-flight fatigue → Express. Group of 3+ or arriving 02:00-05:00 → split a taxi (per-person cost approaches Express).
6. Beyond Seoul — Busan, Daegu, and intercity trains
- T-money works everywhere — Busan (BMS subway + buses), Daegu, Incheon, Daejeon, Gwangju, Ulsan, regional Gyeonggi buses, Gangwon. The same card you bought in Seoul works in Busan with no setup.
- Cashbee and Hanaro — old competing cards, being phased out. If you have one from before, it still works.
- KTX, SRT, ITX, Mugunghwa — intercity trains. T-money is NOT accepted. Buy at letskorail.com (KTX, Mugunghwa, Saemaul, ITX) or etk.srail.kr (SRT). Both sites have English; both accept international credit cards.
- Korea Rail Pass (KR Pass) — foreigner-only unlimited intercity train ticket. 3-day ₩131,000 / 5-day ₩183,000 / 7-day ₩208,000 / 10-day ₩244,000. Worth it for tourist itineraries visiting Busan + Gyeongju + Jeonju in one trip.
- Climate Card — Seoul only by design. Excludes Gyeonggi-only lines (Bundang, Sinbundang). Verify your daily commute before buying.
7. Refund — getting your balance back when leaving Korea
Returning home and have ₩30,000 left on your T-money? Refund is possible but rarely worth the hassle for small amounts.
- Under ₩20,000: any convenience store with a 500-won handling fee. Hand over card + ID, they zero the balance and refund cash on the spot.
- ₩20,000-50,000: T-money customer centers only (Seoul Station, major hub stations). Same 500-won fee.
- Over ₩50,000: T-money headquarters or designated centers with the original purchase receipt or registered card. Process takes 5-10 minutes.
- Climate Card: once activated, no refund. Sit out the remaining days or gift to a friend in Seoul.
- Practical advice: spend down close to zero in your last week. Buy snacks/coffee with the card at any CU/GS25 (T-money works as electronic cash at most convenience stores) rather than going through the refund procedure.
Foreign tourists leaving via Incheon Airport: the T-money refund kiosk at the airport (departures level) handles balances up to ₩20,000 with the 500-won fee. Avoid the line on departure day by spending down at airport convenience stores instead.
Tools to pair with this guide
🚇 Seoul Subway & Bus Fare Calculator 📅 Korean Public Holidays 🛂 Visa & ARC Tracker 📱 Korea Phone PlansFrequently Asked Questions
How does Seoul's free transfer system work?
Discounted to "pay the difference," not strictly free. Requires (1) T-money or Climate Card payment (cash forfeits the discount), (2) tap on entry AND exit on every leg, (3) transfer within 30 minutes (60 min between 21:00-07:00), (4) maximum 4 transfers per trip. You pay the higher of the two base fares plus a distance surcharge for combined kilometers above 10 km. Subway-to-bus, bus-to-subway, and bus-to-bus all qualify. Same-line transfers (e.g., Line 2 → Line 2) don't count.
Is the Seoul Climate Card worth it for me?
30-day Basic ₩62,000 breaks even at 31 trips (about 5 trips/week). 30-day Combined (bus + subway + 따릉이 bike) ₩65,000 same break-even. Short-term passes 1/2/3/5/7-day cost ₩5,000-22,000 and have been sold via international cards since March 2025. Tourists doing 4-5 sightseeing trips/day: 5-day pass beats T-money. Long-term residents commuting daily: 30-day Basic wins. Light walkers or work-from-home: stick with T-money. Climate Card excludes some Gyeonggi-only routes (Bundang, Sinbundang).
How do I get from Incheon Airport to Seoul cheaply?
AREX All-Stop (~58 min, ~₩4,750 on T-money) is integrated with the metro and gives you a free-transfer discount to the rest of the subway. AREX Express (~43 min, ₩13,000 / ₩11,400 online) is a separate flat ticket, reserved seat, no transfers — pays for 15 minutes saved + comfort. Airport limousine bus (₩15,000-17,000) drops you closer to specific hotels but is slower. For most non-luggage travelers, All-Stop wins on cost.
Can I recharge T-money with an overseas credit card?
Mostly yes. Convenience stores (CU, GS25, 7-Eleven, Emart24) accept Visa, Mastercard, and JCB issued anywhere. Subway recharge machines were historically cash-only; Climate Card kiosks (rolled out 2024-2025) at major stations now accept international cards. The T-money mobile app requires a Korean phone number + Korean-bank-issued card — most foreigners can't use it. As of March 2025, foreigners can buy Climate Card short-term passes (1-7 day) directly with international cards at airport and major station kiosks.
Can I get a refund of leftover T-money balance when I leave Korea?
Yes, but with conditions and a fee. Under ₩20,000: any convenience store with a 500-won handling fee. ₩20,000-50,000: T-money customer centers (Seoul Station, major hubs), same fee. Over ₩50,000: T-money HQ or designated centers, original receipt required. Most travelers spend down close to zero by the last day or gift the card to friends — the refund process is rarely worth small balances. Climate Card balances cannot be refunded once activated.
Does T-money work in Busan, Daegu, and other cities?
Yes. T-money is now accepted on subway, bus, and taxi in all major Korean cities — Seoul, Busan, Daegu, Incheon, Daejeon, Gwangju, Ulsan, plus regional buses in Gyeonggi, Gangwon, and most provinces. KTX, SRT, and Mugunghwa intercity trains do NOT accept T-money — buy those separately at Korail. Local rivals (Cashbee, Hanaro) are being phased out in favor of unified T-money; old cards still work everywhere they did. Climate Card is Seoul-only by design.
Do KTX, SRT, and Mugunghwa trains accept T-money?
No. Intercity trains use a separate ticketing system at letskorail.com (KTX, Mugunghwa) or etk.srail.kr (SRT). T-money is for intracity transit — subways, city buses, taxis. For Seoul → Busan or any cross-province trip, buy the train ticket separately. Both sites have English and accept international credit cards. Korea Rail Pass (foreigner-only) gives 3/5/7/10-day unlimited intercity rides at fixed prices — useful for tourist itineraries.
📌 Official sources · References
- T-money official site (Korea Smart Card) · Card purchase locations, balance check, refund procedure. ☎ 1644-0088 (Korean / partial English)
- Seoul Climate Card official portal · 30-day Basic / Combined options, short-term 1-7 day passes, eligible routes
- Visit Seoul — Transportation for tourists · English visitor guide from Seoul Tourism Organization
- Incheon International Airport Corporation · AREX schedule, airport limousine routes, taxi guidance
- Korail (KTX, Mugunghwa, Korea Rail Pass) · Intercity train tickets, Korea Rail Pass (foreigner-only)
- SRT (Suseo-bound high-speed rail) · Alternative high-speed network with different stations
This guide reflects fare structures and service availability as of May 2026 (post-June 2025 fare increase to ₩1,550). Climate Card route exclusions and Gyeonggi-line policies change occasionally; verify your daily commute with the official Climate Card portal before committing to a 30-day pass.
⚠️ Fare amounts and service details reflect Korean transit policy as of May 2026. Fares are typically reviewed every 2-3 years; the next adjustment is expected 2027-2028. Climate Card eligible-route list updates quarterly. Confirm latest details at the official sources linked above before relying on these numbers for budget-critical decisions.