I know you can extend a tourist visa by 1 month at immigration for B1900. Can you do the same thing with multiple entry Non-O visas, and if so how much does it cost?

Thanks for any help.

No. Twelve months only if you qualify.

The most you could extend an entry would be the normal 7 days to pack out and even that might require show of the ticket out if not valid reason for extension. If you have a Thai spouse or child there is a 60 day option available or the normal one year. All extensions of stay cost the same 1,900 baht.

Ok, thanks.

Looks like the perfect excuse for a weekend in Phnom Penh then.

A one year non -imm "O" multi-entry good for one year can be extended for 3 months for a total of 15 months, but you still need to do a visa run before visa expiration.

Edited September 17, 201015 yr by Capealava

No it can not - you can obtain a new 90 day entry if you exit and return prior to the visa expiration.