The Telegraph reports the data, being studied by health secretary Sajid Javid, shows that at the end of last month, only 0.4% of vaccinated travellers arriving back from holiday at UK airports had contracted the virus.
Arrivals jabbed only once were twice as likely to test positive, representing 0.8% of arrivals.
According to the analysis by testing firm Cignpost Diagnostics, which reportedly conducts 11,000 tests on arrivals a day, only between 1 and 1.2% of unvaccinated holidaymakers also tested positive.
