There were a record number of flight cancellations in June as Melbourne's fourth lockdown and Sydney's burgeoning Delta variant outbreak hit interstate travel. Figures from the Bureau of Infrastructure and Transport Research Economics showed 24.5 per cent of all domestic flights in June were cancelled, the highest number since reporting began in November 2003. This compared with just 2.5 per cent of flights cancelled in June 2020, albeit with a much lower number of scheduled flights. The long-term average for flights cancelled is just 1.8 per cent. Jetstar had the highest number of cancellations, with almost 40 per cent of flights cancelled, followed by Virgin Australia (31 per cent), Qantas (29.1 per cent), QantasLink (13.5 per cent), Regional Express (11.1 per cent) and Virgin Australia Regional Airlines (1.3 per cent).