Please be aware that Istanbul has multiple airports and that these results are for all airports serving the city.
The best month to arrive at Istanbul is November and the most expensive month to fly is August. (Average prices, based on 1616 datapoints.)
The best day to arrive at Istanbul is Monday and it would be best to avoid Friday, as prices are on average 32.42% higher than on Monday. (Average prices, based on 4353 datapoints.)
The cheapest airline flying to Istanbul is Aegean Airlines. They are 61% cheaper than Egyptair. (Average prices, based on 1791 datapoints.)
At Istanbul the most flights depart around 21:00. (Hourly flights, based on 1931 datapoints.)
From Istanbul it is on average the cheapest to fly to Antalya and to Dusseldorf. (Average prices, based on 1828 datapoints.)
From Istanbul most of the flights depart to Antalya, second best connected from Istanbul is Amsterdam. (Daily flights, based on 103 datapoints.)