AirHint found the following cheapest one-way flights from London (LCY) to Istanbul (IST) in September 2025 (see full year).
One-Way flights
| 18 Sep | British Airways | ||
| 15 Sep | British Airways | ||
| 23 Sep | KLM | ||
| 27 Sep | KLM | ||
| 25 Sep | KLM | ||
| 26 Sep | KLM | ||
| 19 Sep | KLM | ||
| 16 Sep | British Airways | ||
| 13 Sep | KLM | ||
| 30 Sep | Lufthansa |
Also check the deals for return flights from London to Istanbul in September.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
Find us on social media