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

Return flights

29 Sep - 20 Oct	Eurowings
29 Sep - 06 Oct	British Airways	direct
29 Sep - 20 Oct	British Airways	direct
29 Sep - 22 Oct	British Airways	direct
29 Sep - 11 Oct	Eurowings
27 Sep - 11 Oct	Eurowings
16 Sep - 14 Oct	Eurowings
19 Sep - 11 Oct	Eurowings
25 Sep - 16 Oct	Eurowings
17 Sep - 16 Oct	Eurowings
16 Sep - 30 Sep	Eurowings
19 Sep - 24 Sep	Eurowings
23 Sep - 30 Sep	Eurowings
13 Sep - 27 Sep	Eurowings
19 Sep - 30 Sep	Eurowings
21 Sep - 23 Sep	British Airways
17 Sep - 30 Sep	Eurowings
24 Sep - 29 Sep	Eurowings
11 Sep - 16 Sep	Scandinavian Airlines
15 Sep - 27 Sep	Eurowings

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 $214

Return flights