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

Return flights

05 Dec - 07 Dec	SWISS
03 Dec - 10 Dec	Vueling Airlines
05 Dec - 09 Dec	SWISS
05 Dec - 12 Dec	SWISS
02 Dec - 13 Dec	SWISS
03 Dec - 09 Dec	Lufthansa
02 Dec - 12 Dec	Lufthansa
04 Dec - 07 Dec	Lufthansa
01 Dec - 07 Dec	Lufthansa
01 Dec - 08 Dec	Lufthansa
09 Dec - 22 Jan	Finnair
08 Dec - 26 Jan	Finnair
07 Dec - 22 Jan	Finnair
11 Dec - 21 Jan	Finnair
04 Dec - 19 Jan	Ryanair
31 Dec - 22 Jan	Delta
29 Dec - 29 Jan	Delta
31 Dec - 20 Jan	Delta
05 Dec - 18 Jan	Delta
31 Dec - 18 Jan	Delta

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 834€

Return flights