You can travel to Pattaya by car, bus, van, or even fly. Yes, I am not kidding you can fly to Pattaya.
Car: 147 km. from Bangkok, you can drive to Pattaya in less than two hours by heading southeast through Sukhumvit Road (yeah, same same with The Emporium located). Taking Bangna Trat Highway and then cross the Bang Pakong River to Choburi by pass to get to Sukhumvit Highway. Alternatively, you can catch a taxi to Pattaya at a cost of 1000 Baths to 1500 Baths (depends on your negotiation skill).
Bus: Depart from Ekamai Bus Terminal every 20-40 minutes. Just buy a ticket (128 Baths) for the next departure The journey spends two to two and a half hour. Getting to Ekamai Bus Terminal is easy, just take BTS and get off at Ekamai Station.
Van: Take vans from the Khao San area and expect the journey to take two hours (400 Bahts)
Train: If you have mush time, the train is a good option. Take a single daily first class from Hualampong Train Station at 6.50 am which arrives in Pattaya at 10.18 am. Take subway and get off at Hualampong Station.
Fyl: There is no flights from Bangkok to Pattaya but if you are in Phuket or Koh Samui take flights operated by Bangkok Aiways from Phuket and Koh Samui to O-Tapao airport whici is 30 km south of Pattaya. Please visit www.bangkokair.com for more info.