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

Return flights

01 Oct - 15 Oct	KLM
01 Oct - 07 Oct	KLM
02 Oct - 07 Oct	KLM
07 Oct - 15 Oct	KLM
04 Oct - 06 Oct	KLM
09 Oct - 17 Nov	KLM
07 Oct - 22 Nov	KLM
02 Oct - 16 Oct	KLM
03 Oct - 15 Oct	KLM
03 Oct - 13 Oct	KLM
02 Oct - 13 Oct	KLM
08 Oct - 16 Oct	KLM
25 Oct - 19 Nov	Air France
01 Oct - 09 Nov	KLM
15 Oct - 19 Nov	British Airways	direct
30 Oct - 09 Nov	Air France
30 Oct - 06 Nov	Air France
18 Oct - 07 Nov	KLM
09 Oct - 13 Nov	KLM
31 Oct - 15 Nov	Air France

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 172€

Return flights