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 4271 datapoints.)
The best day to arrive at Istanbul is Monday and it would be best to avoid Friday, as prices are on average 25.38% higher than on Monday. (Average prices, based on 4570 datapoints.)
The cheapest airline flying to Istanbul is ValuAir. They are 76% cheaper than Royal Jordanian. (Average prices, based on 4378 datapoints.)
At Istanbul the most flights depart around 06:00. (Hourly flights, based on 4471 datapoints.)
From Istanbul it is on average the cheapest to fly to Frankfurt and to Amsterdam. (Average prices, based on 1314 datapoints.)
From Istanbul most of the flights depart to London, second best connected from Istanbul is Cairo. (Daily flights, based on 68 datapoints.)