In general, when looking for the cheapest flight to Zagreb, try to choose a flight departing in February for the best deal.
Most flyers found that booking flight tickets 58 days in advance of their planned departure date is, on average, the best time to get cheap flights to Zagreb.
From most locations, the cheapest day to fly to Zagreb is Tuesday. Most users found that departing on a Friday was most expensive.
On average you can find the best deals on plane tickets to Zagreb when looking for flights with afternoon departure times.