Fly to Japan 4th June with Thai gf. She obtains 15 day visa exempt. Return flight is 18th. Counting arrival as first day that makes departure is on 15th day. Is that OK? thanks for any clarification

Arriving on the 4th, departing on the 18th.

That is 15 days incl. arrival and departure date.

So I don't see a problem.

Same interpretation as Thai immigration.

You travel together, have documents on purpose of stay, proof of funds, hotel booking and return flight?

Just asking because your GF will probably be asked/interviewed about her stay.

Thanks khunBENQ. Also your comments accurate re bookings etc. This will be our 4th visit. Yes they ask her where she stay etc. Without onward ticket don't think she would get past the airline in bkk

OK 4th visit, that's the clue.

So no trouble expected.

All clear.