I am new in Thailand and always got a flu shot in USA. 75 yrs old.

Can I just walk into a hospital and get a shot or??

Yes some clinics yes. Google will tell you. Phuket has several small clinics.

 

 

It is not free but hospital can provide - this is not the flu season however (rainy season) - April is normal time to have current vaccine available but if more than 12 months since your last probably good to get now as flu is something you can get year round here. 

I get mine from a local clinic, 500 baht - the same price for years.

 

I did ask once at my local hospital, but they were out of stock.

Private hospitals also supply, but more expensive than a local clinic.