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

Return flights

01 Oct - 08 Oct	KLM
07 Oct - 20 Oct	Lufthansa
23 Oct - 30 Oct	KLM
20 Oct - 21 Oct	Lufthansa
01 Oct - 07 Oct	Lufthansa
17 Oct - 20 Oct	Lufthansa
16 Oct - 20 Oct	Lufthansa
22 Oct - 20 Nov	Lufthansa
01 Oct - 05 Oct	KLM
01 Oct - 06 Oct	KLM
01 Oct - 10 Oct	KLM
29 Oct - 04 Nov	KLM
29 Oct - 05 Nov	KLM
31 Oct - 03 Nov	KLM
30 Oct - 04 Nov	KLM
31 Oct - 04 Nov	KLM
28 Oct - 06 Nov	KLM
31 Oct - 07 Nov	KLM
27 Oct - 05 Nov	KLM
28 Oct - 07 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 $347

Return flights