Please be aware that Istanbul has multiple airports and that these results are only for Istanbul Atatürk Airport.
The best month to arrive at Istanbul is November and the most expensive month to fly is August. (Average prices, based on 5132 datapoints.)
The best day to arrive at Istanbul is Monday and it would be best to avoid Friday, as prices are on average 36.35% higher than on Monday. (Average prices, based on 2658 datapoints.)
The cheapest airline flying to Istanbul is Pegasus Airlines. They are 90% cheaper than British Airways. (Average prices, based on 5321 datapoints.)
At Istanbul the most flights depart around 10:00. (Hourly flights, based on 5802 datapoints.)
From Istanbul it is on average the cheapest to fly to Antalya and to Dusseldorf. (Average prices, based on 387 datapoints.)
From Istanbul most of the flights depart to Antalya, second best connected from Istanbul is Izmir. (Daily flights, based on 140 datapoints.)