What Ho,
I personally suggest you book at Penang, I presume you are going PEN to BKK and return to PEN. Tickets can be dear KUL (KLIA) to BKK return was about 1000 ringgit return, Air Asia have slashed that but you have to go from Johor at the moment. Have you looked at the AA option, Maybe there is a cheaper alternative. Also ask around in Travel Agents I gotta blinding deal one time to go to Yangon.
I cant help we fly freight.
Have a good one
