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 May and the most expensive month to fly is December. (Average prices, based on 2807 datapoints.)
The best day to arrive at Istanbul is Saturday and it would be best to avoid Wednesday, as prices are on average 10.88% higher than on Saturday. (Average prices, based on 3665 datapoints.)
The cheapest airline flying to Istanbul is Pegasus Airlines. They are 78% cheaper than Qatar Airways. (Average prices, based on 3071 datapoints.)
At Istanbul the most flights depart around 10:00. (Hourly flights, based on 3922 datapoints.)
From Istanbul it is on average the cheapest to fly to Izmir and to Antalya. (Average prices, based on 437 datapoints.)
From Istanbul most of the flights depart to Antalya, second best connected from Istanbul is Ankara. (Daily flights, based on 267 datapoints.)