May is usually considered as the cheapest month to fly to Sydney as airfares tend to be lower in price due to off peak season making it a less expensive time to travel to Sydney. Airlines also tend to offer discounts during this season to attract the travelers, for more information like this visit ebooktrip's informational guide. https://travelblogs1697.blogspot.com/2025/08/what-is-cheapest-month-to-fly-to-sydney.html