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

Return flights

02 Dec - 14 Dec	SWISS
02 Dec - 13 Dec	SWISS
02 Dec - 09 Dec	SWISS
02 Dec - 16 Dec	SWISS
02 Dec - 23 Dec	SWISS
03 Dec - 13 Dec	ITA Airways
06 Dec - 10 Dec	ITA Airways
02 Dec - 17 Dec	SWISS
03 Dec - 15 Dec	ITA Airways
08 Dec - 31 Jan	Delta
06 Dec - 31 Jan	Delta
05 Dec - 19 Jan	Delta
06 Dec - 19 Jan	Delta
08 Dec - 19 Jan	Delta
03 Dec - 19 Jan	Delta
08 Dec - 14 Dec	Lufthansa
08 Dec - 11 Jan	Delta
09 Dec - 11 Jan	Delta
05 Dec - 11 Jan	Delta
09 Dec - 19 Jan	ITA Airways

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 $1127

Return flights