Is there any bus service leaving the airport to Pattaya after 11 pm?

No

book yourself a taxi before you leave home  1000 - 1200 Baht

you will pay twice that or more if you take one from the airport

there are a  few links in the topic below.

 

http://www.pattaya-addicts.com/forum/topic/142733-mr-t-taxi-problems/?view=findpost&p=2139149&hl=taxi

Last bus at nine....book the cab :-)

email Mr T 1000baht

 

If you're coming from Angeles City ask in a loud voice if anyone is interested in splitting a taxi to Pattaya. This is better done while at Clark Field waiting for the flight. Works for me. 

If you're coming from Angeles City ask in a loud voice if anyone is interested in splitting a taxi to Pattaya. This is better done while at Clark Field waiting for the flight. Works for me. 

I like your idea.  Nothing wrong with being a little bold

Believe me, other mongers appreciate it. 

which bus is there at 21.00 ? bells last bus is 18.00 i think

i ask because i arrive at 19.00

http://www.airportpattayabus.com/