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

Return flights

28 Sep - 05 Oct	Avianca
26 Sep - 12 Oct	Avianca
26 Sep - 11 Oct	Avianca
25 Sep - 02 Oct	Avianca
22 Sep - 28 Sep	Avianca
23 Sep - 29 Sep	Avianca
29 Sep - 06 Oct	Avianca
21 Sep - 06 Oct	Avianca
07 Sep - 14 Sep	LATAM Airlines Group
17 Sep - 01 Oct	Air Canada
05 Sep - 15 Sep	LATAM Airlines Group
19 Sep - 10 Oct	LATAM Airlines Group
10 Sep - 23 Sep	LATAM Airlines Group
17 Sep - 12 Oct	Avianca
17 Sep - 13 Oct	Avianca
02 Sep - 11 Sep	LATAM Airlines Group
26 Sep - 27 Sep	Avianca
06 Sep - 23 Sep	LATAM Airlines Group
02 Sep - 25 Sep	LATAM Airlines Group
17 Sep - 30 Sep	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 836€

Return flights