My extension of stay expires on 21st Sept. I've found a flight from BKK to Korea leaving at 2.50am on the 22nd that would suit me quite well.

 

Am I right in thinking that I can "exit" thailand in the airport and stay until my flight the next day, without overstaying? is there an official time limit on this and is it airport specifc?

according to the rules, they go by the time of the flight so technically you would be on overstay.  However, if it's only 1 day it wont be an issue if flying out of BKK. Normally a 1 day overstay at BKK there is no fine. If they stamp your passport or not is up to the IO.  If I were you I would just be prepared to pay it (500thb), as it is possible the IO might try and collect the fee (unofficially). 

There will be no fine.

Just a small stamp in your passport that will give you no problems.

It's no problem. Check in early though. ????

36 minutes ago, Lite Beer said:

Just a small stamp in your passport that will give you no problems.

I believe you, but what is this stamp? 

Overstay 1 day doesnt give any problems whatsoever in the future?

I want to come back next as early as possible next year.

6 minutes ago, Chris.B said:

It's no problem. Check in early though. 

The flight is 2.35am, so I'd be looking at checking in 3 hours+ before which would be on the 21st effectively.

50 minutes ago, ericthai said:

according to the rules, they go by the time of the flight

Wouldn't it be when you go through immigration and get stamped out ?

10 minutes ago, Adam219 said:

I believe you, but what is this stamp? 

Overstay 1 day doesnt give any problems whatsoever in the future?

I want to come back next as early as possible next year.

It is an overstay stamp.  It says how many days and how much you paid as a fine (if anything).  It will cause no problems whatsoever.  Here is the one in my passport, never been mentioned on entering;

I have done this before,  and a friend of mine about 2 years ago.

No problems,  no stamp, no fine.

1 hour ago, Adam219 said:

I believe you, but what is this stamp? 

Overstay 1 day doesnt give any problems whatsoever in the future?

I want to come back next as early as possible next year.

I had a one day overstay with no problems on subsequent trips.

I don't remember if they stamped my passport.

The kiosk IO sent me to a manager, who asked me why I overstayed.

I told her I counted wrong, which is true, she just sent me on my way with no scolding or lecture.

The whole thing took one or two minutes.

2 hours ago, Adam219 said:

The flight is 2.35am, so I'd be looking at checking in 3 hours+ before which would be on the 21st effectively.

Go through immigration before midnight then if you are worried.

 

 

I've done this and as said just went through early what was in effect the day before . They mentioned it but no stamp or fine. 

I believe that any overstay of any duration would make you permanently ineligible to apply for an elite visa. Of course that would only qualify as a "consequence" if you were thinking seriously about it.

1 minute ago, pjmorton said:

I believe that any overstay of any duration would make you permanently ineligible to apply for an elite visa. Of course that would only qualify as a "consequence" if you were thinking seriously about it.

One day, doubt it....

2 minutes ago, pjmorton said:

I believe that any overstay of any duration would make you permanently ineligible to apply for an elite visa.

True the PE (elite visa) are serious about overstays it's incorrect to state they have zero tolerance.

Especially short overstay.

In this case one day.