The Australian Technical Advisory Group on Immunisation (ATAGI) has reccomended the minimum time required between a dose of flu vaccine and a dose of COVID-19 Vaccine is 7 days.
There is no requirement regarding the order of flu and COVID vaccines.
No COVID vaccine
If you have not had any COVID-19 vaccine: wait at least 7 days after your flu vaccine to receive your first dose of COVID-19 vaccine
If you have received one dose of COVID-19 AstraZeneca vaccine: wait at least 7 days after this first dose before having your influenza vaccine.
The recommended interval (time) between the first and second dose of AstraZeneca is 6 weeks – ensure you have your influenza vaccine more than 7 days prior to your second dose OR 7 days after your second dose.
If you have received one dose of COVID-19 Pfizer vaccine: do not have your flu vaccine until at least 7 days after your second dose of Pfizer vaccine.