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

Return flights

28 Sep - 09 Oct	KLM
24 Sep - 01 Oct	ITA Airways
23 Sep - 01 Oct	Lufthansa
24 Sep - 26 Sep	Lufthansa
28 Sep - 12 Oct	KLM
23 Sep - 29 Sep	ITA Airways
30 Sep - 07 Oct	ITA Airways
24 Sep - 27 Sep	ITA Airways
26 Sep - 04 Oct	ITA Airways
22 Sep - 26 Sep	Lufthansa
30 Sep - 08 Oct	ITA Airways
28 Sep - 01 Oct	ITA Airways
30 Sep - 01 Oct	ITA Airways
25 Sep - 01 Oct	Lufthansa
25 Sep - 26 Sep	Lufthansa
20 Sep - 25 Sep	ITA Airways
22 Sep - 28 Sep	ITA Airways
22 Sep - 27 Sep	ITA Airways
22 Sep - 24 Sep	ITA Airways
19 Sep - 26 Sep	Lufthansa

Also check the deals for one-way flights from London to Thessaloniki 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 Thessaloniki in September from $392

Return flights