Cheapest return flights from London to Istanbul in September from $321

Best time to book flights for London (LCY) to Istanbul (IST) flights at AirHint

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

Return flights

15 Sep - 22 Sep SWISS
18 Sep - 22 Sep SWISS
18 Sep - 25 Sep Lufthansa
01 Sep - 30 Sep Lufthansa
12 Sep - 15 Sep Lufthansa
10 Sep - 15 Sep Lufthansa
11 Sep - 15 Sep Lufthansa
08 Sep - 15 Sep Lufthansa
09 Sep - 17 Sep SWISS
26 Sep - 30 Sep Lufthansa
10 Sep - 08 Oct Lufthansa
11 Sep - 03 Oct Lufthansa
26 Sep - 03 Oct Lufthansa
29 Sep - 06 Oct Lufthansa
27 Sep - 05 Oct KLM
26 Sep - 01 Oct Lufthansa
19 Sep - 31 Oct KLM
26 Sep - 12 Oct Lufthansa

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

Skyscanner

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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