Please be aware that Istanbul has multiple airports and that these results are for all airports serving the city.
The best month to fly between Istanbul and Ankara is January and the most expensive month to fly is April. (Average prices, based on 733 datapoints.)
The best day to arrive at Istanbul is Saturday and it would be best to avoid Monday, as prices are on average 51.44% higher than on Saturday. (Average prices, based on 381 datapoints.)
The best time to fly is at around 22. (Average prices, based on 879 datapoints.)