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 Jeddah is September and the most expensive month to fly is October. (Average prices, based on 248 datapoints.)
The best day to arrive at Istanbul is Sunday and it would be best to avoid Monday, as prices are on average 40.8% higher than on Sunday. (Average prices, based on 202 datapoints.)
The best time to fly is at around 14. (Average prices, based on 503 datapoints.)