Which travel option is cheapest from Suvarnabhumi (Bangkok Airport) to Huahin at night?

How much is your time worth?

1. The cheapest sensible option is to wait at the airport for 5.5 hours, then take the 07:30 Airport shuttle bus to Hua Hin for 305 baht.

2. The slightly faster and slightly cheaper, but rather challenging option would be to take the little shuttle to the airport's bus terminal (runs 24 hours), then public bus 551 to Victory Monument (40 baht, first bus at 5 AM) and then a minibus to Hua Hin (200 baht, from 6 AM), total cost 240 baht. Warning: finding the right minibus will be difficult if you don't speak Thai (there's no terminal, they just congregate around the traffic circle), and it's not the most savoury neighbourhood in Bangkok to hang around before sunrise.

3. The even faster but more expensive option would to take a taxi to the Southern Bus Terminal (Sai Tai Mai) for around 500 baht, then catch a public BKS bus for around 200 baht, total cost ~700 baht. The first bus leaves at 4 or 5 AM depending on who you believe, and unlike the Victory Monument minibus scrum, finding your bus will be easy.

4. The fastest but most expensive option would be to take a taxi directly to Hua Hin for around 3,000 baht (less your haggling skills are good, more if not).

And for the daytime version of this question, see: Which transportation is best from Bangkok Suvarnabhumi Airport to Hua Hin?