AirHint found the following cheapest return flights from London (LCY) to Istanbul (IST) in September 2026 (see full year).

Return flights

10 Sep - 24 Sep	Lufthansa
14 Sep - 29 Sep	Lufthansa
01 Sep - 30 Sep	Lufthansa
01 Sep - 22 Sep	Lufthansa
07 Sep - 21 Sep	Lufthansa
10 Sep - 15 Sep	Lufthansa
07 Sep - 14 Sep	Lufthansa
10 Sep - 14 Sep	Lufthansa
25 Sep - 30 Sep	Lufthansa
01 Sep - 08 Sep	Lufthansa
25 Sep - 02 Oct	Lufthansa
28 Sep - 20 Oct	Lufthansa
06 Sep - 10 Oct	KLM

Also check the deals for one-way 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.

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Cheapest return flights from London to Istanbul in September from 294€

Return flights