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

Return flights

04 Sep - 09 Sep	KLM
04 Sep - 29 Sep	KLM
02 Sep - 10 Sep	KLM
23 Sep - 29 Sep	KLM
27 Sep - 29 Sep	KLM
05 Sep - 10 Sep	KLM
22 Sep - 07 Oct	KLM
09 Sep - 03 Oct	KLM
06 Sep - 09 Sep	KLM
08 Sep - 22 Sep	KLM
08 Sep - 18 Sep	KLM
02 Sep - 12 Sep	KLM
29 Sep - 02 Oct	KLM
29 Sep - 15 Oct	KLM
28 Sep - 06 Oct	KLM
03 Sep - 16 Oct	KLM
01 Sep - 15 Oct	KLM
08 Sep - 13 Oct	British Airways
27 Sep - 06 Oct	KLM
25 Sep - 04 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 185€

Return flights