hi! I have a 2 entry tourist visa. I arrive 29th september , after2 months can I only fly to an other country like Malaysia and go back , and I have 2 months again?

When you arrive on the 29th you will a 60 day stamp which you can extend by 30 days for 1900 baht at any immigration office within Thailand after which you must leave and re-enter for another 60 day stay which in turn can be extended by 30 days once again......You may exit Thailand by air or overland if you, the mode of transport does not matter as long as you exit. Should you wish not to extend by 30 days you can exit after the 60 day initial stay and re-enter for a further 60 day stay.....it just depends how long you intend to stay overall. Other options than Malaysia would be Cambodia or Laos dependant upon where you will be staying in Thailand.