Can I enter Korea with a one-way ticket?

The official pages we checked do not list an onward or return ticket as an entry requirement, but the immigration officer makes the final decision at the border, and airlines can have their own check-in rules.

• •VisitKorea’s visa and travel requirements page does not mention an onward or return ticket.
• •The final entry decision belongs to the immigration officer at the port of entry.
• △Your airline may ask for proof of onward travel at check-in. Ask the airline before you fly.

• •Proof of your onward plans, such as a booking, in case you are asked
• •Your accommodation address

• •Ask your airline and the Korean embassy or consulate in your country before booking

• 🛂Can I enter Korea without a visa?Many nationalities can enter visa-free for a limited stay, but it depends on your passport and the reason for travel. Check your country, then check whether K-ETA or the e-Arrival card applies.?IT DEPENDSEntry & ImmigrationView answer →
• 🛂Can I enter Korea without a K-ETA?Only if your passport is on the temporary exemption list, which runs through December 31, 2026. Other visa-free travelers must get a K-ETA before boarding. The list has grown since 2023, so check your country on the official K-ETA site.?IT DEPENDSEntry & ImmigrationView answer →

• VisitKorea: Visa & Travel Requirements
• HiKorea (Korea Immigration Service)

No official source found that either requires or waives an onward ticket. Treat this as unconfirmed and ask the airline.