Can Americans come to Canada to get a flu shot?
Provinces and territories administer their own flu immunization programs and there are differences in terms of eligibility for publicly funded vaccines (e.g. universal vs high risk targeted programs). Publicly funded vaccines are intended for Canadian residents. Americans may be able to access private supplies (i.e. pharmacists, private flu vaccine clinics) in different jurisdictions but you would need to speak to the specific jurisdictions about that.