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 395 datapoints.)
The best day to arrive at Istanbul is Friday and it would be best to avoid Monday, as prices are on average 73.51% higher than on Friday. (Average prices, based on 276 datapoints.)
The cheapest airline flying from Istanbul to Ankara is Pegasus Airlines. They are 49% cheaper than ValuAir. (Average prices, based on 413 datapoints.)