Can i get the re-entry permit at BKK Airport before i fly out or should i better go local immigration?
Flight goes 00.05, so i'll be airport around 23.00
TLDR : Answer Summary
You can obtain a re-entry permit at Bangkok Airport (BKK) before your flight, which is open 24/7. However, it’s advisable to arrive at the airport well in advance (at least 2.5 hours) to account for tailing check-in and potential queues at passport control. The fee for a single re-entry permit is 1,000 THB, plus an additional 200 THB if you don’t have the pre-filed application form or photos.