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

Return flights

24 Sep - 28 Sep	Avianca
29 Sep - 12 Oct	Avianca
30 Sep - 12 Oct	Avianca
23 Sep - 28 Sep	Avianca
29 Sep - 03 Oct	Avianca
25 Sep - 29 Sep	Avianca
23 Sep - 27 Sep	Avianca
28 Sep - 03 Oct	Avianca
28 Sep - 04 Oct	Avianca
22 Sep - 27 Sep	Avianca
30 Sep - 04 Oct	Avianca
16 Sep - 23 Sep	LATAM Airlines Group
18 Sep - 23 Sep	Avianca
17 Sep - 06 Oct	LATAM Airlines Group
19 Sep - 11 Oct	LATAM Airlines Group
08 Sep - 09 Oct	Avianca
09 Sep - 18 Sep	Air France
18 Sep - 10 Oct	Avianca
20 Sep - 22 Sep	Air France
09 Sep - 11 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 775€

Return flights