The best month to fly between Dusseldorf and Istanbul is November and the most expensive month to fly is April. (Average prices, based on 394 datapoints.)
The best day to arrive at Dusseldorf is Friday and it would be best to avoid Thursday, as prices are on average 90.31% higher than on Friday. (Average prices, based on 390 datapoints.)
The best time to fly is at around 17. (Average prices, based on 712 datapoints.)