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

Return flights

14 Oct - 23 Oct	KLM
10 Oct - 13 Oct	KLM
03 Oct - 06 Oct	KLM
10 Oct - 16 Oct	KLM
13 Oct - 17 Oct	KLM
28 Oct - 04 Nov	SWISS
23 Oct - 29 Oct	SWISS
31 Oct - 09 Nov	SWISS
23 Oct - 06 Nov	KLM
21 Oct - 28 Oct	SWISS
08 Oct - 14 Oct	British Airways
28 Oct - 05 Nov	KLM
28 Oct - 06 Nov	KLM
31 Oct - 04 Nov	SWISS
30 Oct - 02 Nov	KLM
13 Oct - 15 Oct	British Airways
27 Oct - 04 Nov	KLM
31 Oct - 05 Nov	KLM
27 Oct - 30 Oct	SWISS
31 Oct - 07 Nov	KLM

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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from London to Istanbul in October from 181€

Return flights