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

Return flights

02 Sep - 20 Sep	AJet	direct
03 Sep - 17 Sep	AJet	direct
19 Sep - 03 Oct	AJet	direct
03 Sep - 25 Sep	Pegasus Airlines
01 Sep - 10 Oct	AJet	direct
10 Sep - 23 Oct	AJet	direct
03 Sep - 16 Oct	AJet	direct
03 Sep - 19 Oct	AJet	direct
01 Sep - 11 Sep	AJet
03 Sep - 25 Sep	AJet	direct
19 Sep - 30 Sep	Pegasus Airlines
01 Sep - 23 Sep	AJet	direct
05 Sep - 24 Sep	AJet	direct
02 Sep - 21 Sep	AJet	direct
04 Sep - 24 Sep	AJet	direct
01 Sep - 02 Oct	AJet	direct
15 Sep - 18 Oct	AJet	direct
19 Sep - 17 Oct	AJet	direct
26 Sep - 04 Oct	AJet	direct
01 Sep - 06 Oct	AJet	direct

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

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 September from 100€

Return flights