Train departs Bangkok daily Monday to Friday at 6.55 a.m. arriving at the Pattaya train station at 10:31a.m. More information:
www.yourpattaya.com/bangkok_airport_to_pattaya.htm
Air conditioned buses depart Pattaya for Bangkok and Bangkok for Pattaya every half hour between 5.30am and 11.00pm. The single fare is 118 baht per person.
There is also an airport bus service. For map, fares and time table go to:
http://www.yourpattaya.com