Can I do a visa run to extend my stay in Thailand with my current visa?

I guess you're asking about a border run, not a visa run.

You seem to be confused as to what visa you have. There is no Non-O with a validity of 180 days.

You likely have a multi entry tourist visa.

Figure that part out first.

With the multi entry tourist visa, you should be able to enter just before it expires in December, and be stamped in for 60 days, which you can extend with another 30 days.

Bringing your stay to around March.

@Michael **********

"I applied for a 3 month visa and it appears to be valid from June 25th until December 21st." . . . . Now THIS leaves me completely devastated. . . . . this sounds like you were issued a 6-months multi entry tourist visa. It can't be a 180-days Non-Imm-O visa as there is nothing such. And entering in October would make little sense as you would lose more than half of the visa validity

@Michael **********

Ah, okay.

You plan to enter on a 90-days single entry Non-Imm-O visa, and use it for a holiday of 90 days. Then you plan to do a border-bounce, to get stamped in for 60 more days upon re-entry

*** I would say your plan is okay and will work, as long as the Immigration officer at the border likes your past entry-stamp history of the recent 365-days, most of all when he doesn’t find “too many” visa-exempt entries and touristic entries

Regardless of all - be prepared to be asked for the three famous proofs:

*Cash equivalent of 20,000 THB

*a few nights of a booked accommodation

*Proof of onward travel leaving Thailand within these visa-exempt 60 days

Safe trip and a nice holiday!

What kind of visa do you have? I'm not aware of any visa that gives you 80 days

You can try use border bounce agent

You've got a visa? Why not extend it for 30 days. Some countries you get 60 days entry without a visa.