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

Return flights

04 Dec - 07 Dec	Lufthansa
03 Dec - 07 Dec	Lufthansa
02 Dec - 07 Dec	Lufthansa
04 Dec - 29 Jan	Lufthansa
04 Dec - 28 Jan	Air Canada
05 Dec - 09 Dec	Air Canada
01 Dec - 09 Dec	Air France
06 Dec - 12 Dec	Finnair
05 Dec - 12 Dec	Finnair
05 Dec - 30 Jan	Finnair
08 Dec - 20 Jan	Finnair
03 Dec - 12 Dec	Finnair
05 Dec - 14 Dec	Finnair
02 Dec - 23 Dec	Air Canada
25 Dec - 19 Jan	Delta
25 Dec - 22 Jan	Delta
25 Dec - 29 Jan	Delta
08 Dec - 14 Jan	Delta
06 Dec - 18 Jan	American Airlines
31 Dec - 22 Jan	Avianca

Also check the deals for one-way flights from London to Santiago in December.

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 December from 835€

Return flights