With an approved K-ETA, US citizens can stay in South Korea for up to 90 days.
| Maximum tourist stay | 90 days |
| Visa situation | Electronic travel authorization required |
| Before you fly | K-ETA |
| Passport validity required | 6 months beyond your stay |
US citizens need to register for South Korea's K-ETA (Korea Electronic Travel Authorization) online before departure, in addition to the visa-free short-stay allowance.
Check your specific case + free PDF report →To stay in South Korea beyond 90 days you generally need to either apply for an extension with the local immigration authority before your current stay expires, or leave and re-enter — though many countries watch for back-to-back 'visa runs' and can refuse re-entry. For remote workers, a digital nomad or long-stay visa is usually the cleaner path.
One detail that catches travelers out: South Korea expects your passport to remain valid for 6 months beyond your planned stay. Airlines enforce this at check-in, so a passport expiring soon can end a trip before it starts — check yours before booking.
Overstaying in South Korea — even by a few days — can mean fines, being flagged in the immigration system, and trouble on future entries. Some countries also bar re-entry for a period proportional to the overstay. The safe play is simple: count your days from the entry stamp (not your booking dates), set a reminder a week before your limit, and if plans change, deal with immigration before the deadline rather than after.
Sometimes, but not reliably. Immigration officers can refuse entry if your passport shows back-to-back tourist stays that look like de-facto residence. One or two re-entries per year for genuine trips are normally fine.
Yes — K-ETA. Arrange it before departure; airlines check at the gate.
Working for a foreign employer while visiting is a legal grey zone in most countries. For anything beyond answering emails on vacation, check the digital nomad visa options for South Korea — many destinations now have a dedicated permit for exactly this.