Statistically, the cheapest month to fly to Istanbul is February, followed closely by January and November. During these winter months, the weather in Turkey is cold, damp, and occasionally snowy, leading to a significant drop in tourism and lower demand for flights. Travelers can often find fares that are 30% to 50% cheaper than the peak summer months of July and August. If you prefer milder weather while still avoiding the highest prices, the "shoulder" months of March and October offer a great balance. In 2026, the emergence of more low-cost carriers like AJet and Pegasus at Sabiha Gökçen (SAW) has made budget travel even more accessible. For the absolute lowest price, booking your February flight roughly 4 to 6 weeks in advance is the current "sweet spot." While you'll need a heavy coat and an umbrella, visiting in the off-season allows you to explore the Hagia Sophia and the Grand Bazaar without the overwhelming summer crowds and at a fraction of the transport cost.