The best month to fly between Izmir and Istanbul is March and the most expensive month to fly is May. (Average prices, based on 387 datapoints.)
The best day to arrive at Izmir is Saturday and it would be best to avoid Thursday, as prices are on average 117.08% higher than on Saturday. (Average prices, based on 642 datapoints.)
The best time to fly is at around 5. (Average prices, based on 472 datapoints.)