Jeju: different island, different math

Jeju is the one major Korean destination where rail logic doesn't apply — you fly, and once there you drive or bus. Plan it as its own mini-trip.

Getting there

Gimpo–Jeju is one of the world's busiest air routes, with dozens of flights daily and fares that swing hugely by day and hour. Book the popular Friday/Sunday slots early; midweek off-peak flights can cost less than a KTX ticket. There is no rail link and no ferry worth a typical visitor's time, so your KORAIL Pass simply pauses here — don't count Jeju days as pass days when running the rail calculator.

Getting around

A rental car unlocks the island — waterfalls, Ols along the coast, Seongsan sunrise peak — and is the default for most visitors; an international driving permit is required. The bus network is usable and cheap if you base yourself in Jeju City or Seogwipo and accept slower days. Taxis for single scenic legs are reasonable split among a group.

Budget notes

• Nature is Jeju's headline and much of it is free or nearly so (Hallasan trails, beaches).
• Paid attractions are individually cheap; there's no Jeju equivalent of a big city pass.
• Car rental + fuel typically replaces what you'd spend on passes elsewhere.

Fold Jeju into your overall plan with the trip planner and the budget guide.