84-year-old professor arrives in Sydney after Philippines detention

An 84-year-old Australian who was barred from entering the Philippines has arrived back in Sydney after spending six days detained at Manila airport.

Australian Gill Boehringer Source: AAP

An Australian activist who spent six days detained at an airport in the Philippines has arrived in Sydney.

NSW professor Gill Boehringer arrived in Sydney on Wednesday morning after boarding a flight from Manila via the Chinese city of Guangzhou on Tuesday.

The elderly man was barred from entering the Philippines on August 8 after being placed on the Bureau of Immigration's blacklist for attending a rally in the country three years ago.

Although relieved to be back in Sydney, Prof Boehringer said he won't be let back into the Philippines.

"President (Rodrigo) Duterte is determined to keep me out," he told AAP at the airport.