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

Return flights

17 Sep - 01 Oct	Avianca
22 Sep - 26 Sep	Avianca
09 Sep - 30 Sep	Avianca
10 Sep - 28 Sep	Avianca
16 Sep - 21 Sep	Avianca
08 Sep - 22 Sep	Avianca
07 Sep - 22 Sep	Avianca
08 Sep - 21 Sep	Avianca
25 Sep - 09 Oct	Avianca
14 Sep - 22 Sep	Avianca
07 Sep - 23 Sep	Avianca
08 Sep - 23 Sep	Avianca
11 Sep - 06 Oct	Avianca
09 Sep - 02 Oct	Avianca
16 Sep - 01 Oct	Avianca
16 Sep - 04 Oct	Avianca
12 Sep - 06 Oct	Avianca
18 Sep - 10 Oct	Avianca
16 Sep - 04 Oct	British Airways	direct
12 Sep - 06 Oct	British Airways	direct

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 837€

Return flights