City Buses, Bangkok
Buses are the cheapest option to get around Bangkok: we paid between 3.5 baht to 8 baht depending on wether the bus had no fans, fans or air-condition. SOme are quite basic but still fun to ride, except if you get stuck in the traffic. The best thing is to avoid taking a bus during rush hours. Routes are a bit hard to figure out - but normally if you ask a shop-owner nearby he'll be able to let you know which bus to take. Tickets are bought on board.
There are three types of city bus in Bangkok. The cheapest ones,
cost 3.5 baht, are not air conditioned.
The fare for air-conditioned ones ranges from 10 baht to 16 baht depending on the distance traveled.
One thing that I absolutely hate about Bangkok's city bus is that the buses won't stop at the bus stations.
You may have to do a cartwheel in order to catch the driver's attention.
And also be careful when you get off the bus since motorcycles may run you over.
and it's good idea to buy a one day ticket coz you can take bus to anywhere and much as much you want in one day
ABOUT A NEW BUS SERVICE STARTING MARCH 15, 2002 (Source The State Railway Authority of Thailand)
"The State Railway Authority has launched a new service using air-conditioned buses to transport train passengers to and from the Hualamphong
The rail-bus service launched on March 15, serves only two routes : Sukhumvit and Ratchadamnoen.
Also, the service is now available for passengers of Special Express and Express trains only. The bus fare is 30 baht per trip.
The Sukhumvit route runs from Hua Lamphong via Rama IV road to Samyan, Mahboonkrong, Siam Square, Ratchaprasong, Phloen Chit, Sukhumvit
The Ratchadamnoen route extends from Rama IV road to Samyan, Phaya Thai, Phetchaburi, Lan Luang, Ratchadamnoen Klang, Ratanakosin hotel, Sanam Luang, Phra Athit and Khao San road".
As transport is so varied and cheap in BKK, I never dared to take local buses. Anyway, they seemed old and slow.
You can find more info and bus routes at the website below.
Thailand has a great bus system. In the city the buses take you to places, where the new subway or sky train does go. They are cheap, usually cheaper than the subway. So they are much more crowded.
If you have time, the bus networks offers a fun way to explore the city cheaply. There are both air-conditioned and open-air buses. Rates start from 3.50 Bhat up to 18 Bhat.