When to visit Istanbul for the best price
The lowest fares fall in November, January and February, with Paris-Istanbul returns often under €130 — the trade-off being cool, rainy weather. Spring (April to early June) and autumn (September-October) bring 20-25 °C, great light and reasonable queues.
Avoid July and August: heavy heat, dense crowds at Hagia Sophia and peak hotel prices. Book 5 to 8 weeks ahead and compare Tuesday/Wednesday departures, often 15-20% cheaper than Friday evening.