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 260 datapoints.)
The best day to arrive at Istanbul is Sunday and it would be best to avoid Saturday, as prices are on average 55.92% higher than on Sunday. (Average prices, based on 281 datapoints.)
The cheapest airline flying from Istanbul to Jeddah is Nas Air. They are 64% cheaper than Saudi Arabian Airlines. (Average prices, based on 272 datapoints.)
The best time to fly is at around 11. (Average prices, based on 429 datapoints.)