The last date of our O Visa extension is 6-21.

Our flight is to leave at 13:30pm on 6-22.

Will get a hassle, pay a fine for a few hours over? Or is there a standard grace period?

Should we (can we) clear customs at midnight on the 21st at the CNX airport

and just wait in the lobby 13 hours before our flight leaves?

Thanks for your help as soon as possible.

Bill

Yes you could clear Immigration the night before, and wait in the airport as you suggested or a small find of Bhat 500. per day of overstay. may be payable.

Yes you could clear Immigration the night before, and wait in the airport as you suggested or a small find of Bhat 500. per day of overstay. may be payable.

As far as I know yes they do give you 1 days grace but at the very worst like the last poster said a 500 baht fine

Airports do not charge a fine for one day overstay.