Have done this before a long time back but cannot remember the best routing.

Whether from here to Korat then onward to Pattaya or go all the way back to Morchit, where there would obviously be more frequent connections but maybe a bit more travel time going back through the city and out again.

Edited January 15, 201511 yr by fishhooks

My wife's mother lives just north of Phimai. She takes a but to Khorat then a direct bus to Pattaya from there. My wife goes to Morchit first then transfers. She says it's much faster, but a bit more of a hassle as you've got to negotiate Morchit. Easy for her but not so easy for her mother.

So depends on which one you prefer. Slower but less hassles or faster with a change in Morchit.