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

Return flights

10 Sep - 25 Sep	Aer Lingus
08 Sep - 29 Sep	Air France
16 Sep - 25 Sep	LATAM Airlines Group
17 Sep - 24 Sep	Vueling Airlines
05 Sep - 18 Sep	Air France
09 Sep - 18 Sep	Air France
08 Sep - 18 Sep	Air France
03 Sep - 16 Sep	Air France
08 Sep - 19 Sep	Air France
04 Sep - 16 Sep	Air France
21 Sep - 21 Oct	British Airways
21 Sep - 11 Oct	British Airways
17 Sep - 04 Oct	Vueling Airlines
17 Sep - 08 Oct	Vueling Airlines
16 Sep - 23 Oct	Avianca
21 Sep - 08 Oct	British Airways
20 Sep - 07 Oct	Vueling Airlines
11 Sep - 02 Oct	Vueling Airlines
25 Sep - 11 Oct	British Airways
25 Sep - 10 Oct	British Airways

Also check the deals for one-way flights from London to Santiago 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 Santiago in September from $1040

Return flights