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 75% cheaper than Qatar Airways. (Average prices, based on 4394 datapoints.)
At Istanbul the most flights depart around 10:00. (Hourly flights, based on 4504 datapoints.)
From Istanbul it is on average the cheapest to fly to Dusseldorf and to Frankfurt. (Average prices, based on 1300 datapoints.)
From Istanbul most of the flights depart to Dusseldorf, second best connected from Istanbul is London. (Daily flights, based on 77 datapoints.)