AirHint found the following cheapest return flights from London (LCY) to Buenos Aires (EZE) in December 2025 (see full year).

Return flights

04 Dec - 11 Dec	ITA Airways
01 Dec - 10 Dec	British Airways
03 Dec - 09 Dec	British Airways
02 Dec - 10 Dec	SWISS
02 Dec - 13 Dec	SWISS
03 Dec - 08 Dec	Lufthansa
04 Dec - 14 Dec	British Airways
03 Dec - 14 Dec	British Airways
01 Dec - 05 Dec	ITA Airways
31 Dec - 28 Jan	Lufthansa
01 Dec - 07 Dec	ITA Airways
05 Dec - 19 Jan	Delta
08 Dec - 19 Jan	Delta
31 Dec - 31 Jan	ITA Airways
23 Dec - 21 Jan	SWISS
10 Dec - 10 Jan	Delta
08 Dec - 10 Jan	Delta
09 Dec - 10 Jan	Delta
31 Dec - 18 Jan	Delta
30 Dec - 21 Jan	SWISS

Also check the deals for one-way flights from London to Buenos Aires 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 Buenos Aires in December from 985€

Return flights