To save on the cost of your flight from Indiana to Sydney, book at least 46 days before your planned departure. Booking around this time can save you about 16% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $972 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1089.
Due to multiple factors, expect to potentially pay more when booking in December. For low rates, March can be a great choice for travel to Sydney. Flights to Sydney from Indiana in March are about $1040 on average during March, but can be found for as low as $734.