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

Return flights

22 Sep - 28 Sep	British Airways
14 Sep - 29 Sep	Ryanair
19 Sep - 22 Sep	Ryanair
16 Sep - 21 Sep	British Airways
26 Sep - 30 Sep	Ryanair
19 Sep - 30 Sep	Ryanair
14 Sep - 20 Sep	Ryanair
29 Sep - 04 Oct	Ryanair
20 Sep - 24 Sep	Ryanair
20 Sep - 01 Oct	Ryanair
14 Sep - 28 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
26 Sep - 14 Oct	Ryanair
20 Sep - 05 Oct	Ryanair
26 Sep - 14 Oct	Turkish Airlines	direct
20 Sep - 01 Oct	Turkish Airlines	direct
20 Sep - 05 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Luxemburg 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 Luxemburg to Istanbul in September from $191

Return flights