According to Virgin Australia Change Flight, you can make free changes within 24 hours of bookings. If you missed out on thethe free change window then you will have to change the fee. Bookings must be made at least 7days from the departure. If the previous flight ticket is cheaper than the new flight then pessengers have to pay the amount for changes.

https://airlinespolicy.com/flight-change-policy/virgin-australia-flight-change-policy/

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