How and where can I obtain a re-entry permit at Don Muang Airport or Suvarnabhumi Airport in Bangkok?

You can obtain a re-entry permit at both Don Muang (DMK) and Suvarnabhumi (BKK) airports. At BKK, inform the Immigration Officer (IO) at passport control that you need a re-entry permit, and they will direct you to the appropriate desk (located in International Departures 2, before the Immigration desks). At DMK, you can find the desk after Immigration. It's important to note that the permit does not extend your visa; it only allows you to leave and return without losing your remaining visa duration, which still expires on 16/11/2026.