British Airways will suspend its London-Sydney flights until at least October 30 2021 in a sweeping 'right-sizing' of the airline's international network.
London-Bangkok flights will also be halted until the end of October, although the daily London-Singapore service will remain open.
However, BA's footprint across Asia will be cut by a third as Kuala Lumpur, Seoul and Osaka are scrapped entirely.
Earlier this month the Oneworld member adjusted its scheduled to show a March 28 restart for Sydney, which was also being downgraded from a Boeing 777-300ER to a Boeing 787-9.
A British Airways spokesman told Executive Traveller the extended delays for returning to Sydney and Bangkok were "due to the current Coronavirus pandemic and global travel restrictions."
"We will be in touch with any customers whose flights are affected and advise customers to check ba.com for the latest flight information."
BA's ongoing flights to Singapore, Hong Kong, Tokyo, Beijing and Shanghai will rely on either a Boeing 777 or a Boeing 787, although none are currently listed as featuring the airline's latest Club Suites in business class.
Other destinations dropped in the network revamp include Abu Dhabi, Durban, Calgary, Charleston, Muscat and Pittsburgh, while direct flights to Buenos Aires will be replaced by an onwards 'tag' flight from Sao Paulo.