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

Return flights

24 Sep - 01 Oct	Aer Lingus
24 Sep - 30 Sep	Aer Lingus
10 Sep - 17 Sep	Aer Lingus
15 Sep - 24 Sep	Aer Lingus
09 Sep - 23 Sep	ITA Airways
01 Sep - 03 Sep	ITA Airways
26 Sep - 30 Sep	ITA Airways
01 Sep - 02 Sep	ITA Airways
30 Sep - 06 Oct	ITA Airways
03 Sep - 09 Sep	ITA Airways
02 Sep - 24 Sep	ITA Airways
10 Sep - 16 Sep	ITA Airways
29 Sep - 06 Oct	Aer Lingus
30 Sep - 01 Oct	ITA Airways
05 Sep - 02 Oct	ITA Airways

Also check the deals for one-way flights from London to Paris 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 Paris in September from $299

Return flights