Biman is not always in time, does not want to waste time and checkin to the hotel in bkk at midnight..
Have twice ex with Biman and dont like to try anymore, some more not really cheep if you count the Tax in..not easy to book the air ticket, unless you booking few months in advance..
Air Nepal still have but never wanna try cos TG to me is good enought, I paid S$300 net to flight there either reach there 12 noon, or 10 pm is just right for me.
As for free and easy, dont forget you have to share the room with other, if not you have to pay double, and I like to have the room to my ownself, does not want to let other see what you do at night
And if you have double room, pay double is not cheep those..
book hotel from internet is easy this day, S$50 can have a good double room, if not go to SG base hotel, will only pay 600 baht a night, ofcos not good like Novetel in siam square.
Cheers