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

Return flights

04 Dec - 13 Dec	ITA Airways
01 Dec - 12 Jan	Delta
05 Dec - 12 Dec	British Airways
04 Dec - 14 Dec	British Airways
05 Dec - 14 Dec	British Airways
06 Dec - 09 Dec	ITA Airways
31 Dec - 18 Jan	Delta
01 Dec - 07 Dec	ITA Airways
09 Dec - 11 Jan	Delta
03 Dec - 19 Dec	ITA Airways
06 Dec - 16 Dec	ITA Airways
03 Dec - 08 Jan	Delta
05 Dec - 21 Dec	British Airways
09 Dec - 21 Jan	SWISS
01 Dec - 15 Dec	British Airways
03 Dec - 17 Jan	Delta
29 Dec - 25 Jan	Delta
10 Dec - 20 Jan	Delta
10 Dec - 15 Jan	ITA Airways
08 Dec - 17 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 $1291

Return flights