Finnair has expanded its codeshare agreements with fellow Oneworld carriers Qantas and Japan Airlines.
The European airline's passengers will be able to connect to Perth via Singapore on services operated by Qantas from June 26.
This will be in addition to the current codeshare Finnair has in place with Cathay Pacific to connect to Perth via Hong Kong.
The carrier said in a statement: "Finnair passengers can also connect to Sydney, Melbourne, Brisbane, Adelaide and Cairns via Singapore, Bangkok or Hong Kong on Finnair's codeshare services with Qantas and Cathay Pacific."
Finnair passengers can also connect to Busan via Tokyo Narita on Japan Airlines' daily service.
Last month, Japan Airlines expanded its codeshare agreement with Finnair and British Airways to include two Dublin services (see news, April 29).