Kul LCCT Connexion
I think 1hr 45 mins is ample,.....if there are no delays between Bangkok KL. You can check bagage through all the way from Bangkok to Langkawi. Immigration at LCCT is a doddle unless you have an Israeli passport......... They won't let you in. X-rays are done at Bangkok. X-rays in KL are done behind the scene if your journey is onward within Malaysia. Only hand luggage is x-rayed as per usual for transit passangers. Beware, drugs carry the death panalty if over the limit. Go through green if you have nothing to declare. But, But, But, take heed as per below:-
To be on the safe side, go for the 4 hr layover, as suggested. The trouble is..... LCCT is very very basic.... a low cost terminal!