In general, when booking your flight to Split, October is the cheapest month on average.
In general, most flyers find the cheapest time to book a flight to Split is about 60 days prior.
In general, booking your departure to Split for a Tuesday represents the best deal on airfare. Try to avoid a Friday departure to stay away from the highest prices.
On average you can find the best deals on plane tickets to Split when looking for flights with afternoon departure times.