AirHint found the following cheapest return flights from London (LCY) to Istanbul (SAW) in September 2025 (see full year).

Return flights

20 Sep - 24 Sep	KLM
19 Sep - 24 Sep	KLM
18 Sep - 30 Sep	KLM
18 Sep - 22 Sep	KLM
18 Sep - 25 Sep	KLM
22 Sep - 28 Sep	KLM
15 Sep - 28 Sep	KLM
25 Sep - 03 Oct	KLM
25 Sep - 28 Sep	KLM
23 Sep - 28 Sep	KLM
25 Sep - 02 Oct	KLM
08 Sep - 19 Sep	KLM
20 Sep - 05 Oct	KLM
29 Sep - 07 Oct	SWISS
29 Sep - 09 Oct	KLM
30 Sep - 07 Oct	British Airways
29 Sep - 01 Oct	SWISS
16 Sep - 09 Oct	KLM
30 Sep - 06 Oct	British Airways
28 Sep - 05 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 176€

Return flights