Where Can I Buy a Re-Entry Permit at BKK Airport?

To purchase a re-entry permit at BKK airports, the location differs: at Suvarnabhumi Airport, the counter is located before the passport control in Departure 2. In contrast, at Don Mueang Airport, the counter is located after the passport control, meaning you need to stamp out before buying the permit. Make sure to inform the officials that you need to get a re-entry permit when you exit.