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

Return flights

22 Oct - 27 Oct	SWISS
23 Oct - 28 Oct	Lufthansa
07 Oct - 15 Oct	KLM
08 Oct - 22 Oct	ITA Airways
07 Oct - 16 Oct	KLM
02 Oct - 16 Oct	KLM
02 Oct - 14 Oct	KLM
04 Oct - 15 Oct	KLM
11 Oct - 15 Oct	KLM
02 Oct - 06 Oct	KLM
30 Oct - 19 Nov	Lufthansa
31 Oct - 03 Nov	Lufthansa
31 Oct - 04 Nov	ITA Airways
27 Oct - 09 Nov	SWISS
29 Oct - 05 Nov	ITA Airways
28 Oct - 09 Nov	Lufthansa
28 Oct - 10 Nov	British Airways
29 Oct - 02 Nov	SWISS
27 Oct - 03 Nov	British Airways
28 Oct - 02 Nov	Lufthansa

Also check the deals for one-way flights from London to Istanbul in October.

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 October from 345€

Return flights