Cheapest return flights from London to Istanbul in September from $338

AirHint found the following cheapest return flights from London (LCY) to Istanbul (IST) in September 2026 (see full year).

Return flights

15 Sep - 29 Sep KLM
17 Sep - 29 Sep Lufthansa
17 Sep - 22 Sep Lufthansa
01 Sep - 30 Sep Lufthansa
30 Sep - 02 Oct KLM
11 Sep - 25 Sep Lufthansa
24 Sep - 05 Oct Lufthansa
07 Sep - 10 Sep Lufthansa
01 Sep - 08 Sep Lufthansa
18 Sep - 27 Sep KLM
24 Sep - 27 Sep Lufthansa
07 Sep - 13 Sep Lufthansa

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

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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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