Want to leave before my retirement visa extension can be processed. Usually 30 days before. If I go to C. Wattana with an airline ticket can I get the extension? It will be about 60 days before visa expires. Go in in April, visa expires in June.

You can ask but normally they have a 45 early limit. Always have option to obtain a new non immigrant O visa for entry and then start extensions 60-80 days later again. Not much more cost than getting re-entry permit if you will be in a location to obtain visa.

At CW you can apply for extension to your permission of stay 45 days before your stay expires. Any reentry permit will only be valid until your permission of stay expires.

Your flight ticket has zero relevance.