I would like to fly from Chennai (India) to Thailand or Malaysia or Indonesia. Best with a one-way-ticket. As I experienced a refusal to enter India with a one-way flight ticket, I would like to ask if these countries apply the same rule, will I be allowed to fly into Thailand or Malaysia or Indonesia ?
Indonesia tends to change its unwritten rules every other day -__-
Basic rule is you need to show a continuation ticket.
Definition of "continuation ticket" depends who and when you ask. Sometime a ticket KL-Tokyo proves that you intend to leave Indonesia, sometime it doesn't.
If you have a letter from a sponsor (someone saying he takes responsibility for you to leave on time), you don't have to provide a continuation ticket. But last time I tried, they said I needed to provide an entry ticket :'(
In theory you need a continuation ticket. I've been there dozen of time and they never asked me.