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 September. (Average prices, based on 2587 datapoints.)
The best day to arrive at Istanbul is Monday and it would be best to avoid Saturday, as prices are on average 13.59% higher than on Monday. (Average prices, based on 3860 datapoints.)
The cheapest airline flying to Istanbul is Pegasus Airlines. They are 62% cheaper than British Airways. (Average prices, based on 2846 datapoints.)
At Istanbul the most flights depart around 07:00. (Hourly flights, based on 3258 datapoints.)
From Istanbul it is on average the cheapest to fly to Antalya and to Dusseldorf. (Average prices, based on 412 datapoints.)
From Istanbul most of the flights depart to Antalya, second best connected from Istanbul is Jeddah. (Daily flights, based on 185 datapoints.)