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

Return flights

24 Sep - 12 Oct	Avianca
25 Sep - 02 Oct	Avianca
09 Sep - 15 Sep	LATAM Airlines Group
17 Sep - 30 Oct	Avianca
08 Sep - 29 Sep	LATAM Airlines Group
11 Sep - 18 Sep	LATAM Airlines Group
09 Sep - 16 Sep	Sky Airline
26 Sep - 29 Sep	Copa
10 Sep - 21 Sep	Avianca
08 Sep - 22 Sep	Avianca
02 Sep - 08 Sep	LATAM Airlines Group
10 Sep - 22 Sep	Avianca
10 Sep - 28 Sep	Avianca
19 Sep - 11 Oct	Avianca
19 Sep - 30 Oct	Avianca
19 Sep - 30 Oct	British Airways	direct
16 Sep - 30 Oct	Avianca
18 Sep - 30 Oct	Avianca
09 Sep - 14 Oct	Avianca
09 Sep - 21 Oct	Avianca

Also check the deals for one-way flights from Santiago to London 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 Santiago to London in September from 763€

Return flights