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

Return flights

01 Dec - 10 Dec	ITA Airways
04 Dec - 10 Dec	ITA Airways
01 Dec - 12 Dec	ITA Airways
04 Dec - 15 Dec	ITA Airways
02 Dec - 11 Dec	ITA Airways
08 Dec - 22 Dec	Delta
09 Dec - 24 Jan	Delta
06 Dec - 22 Dec	Delta
09 Dec - 22 Dec	Delta
06 Dec - 11 Jan	Delta
30 Dec - 19 Jan	Iberia
01 Dec - 05 Dec	Aerolineas Argentinas
02 Dec - 23 Dec	SWISS
01 Dec - 25 Jan	ITA Airways
31 Dec - 27 Jan	Iberia
31 Dec - 29 Jan	Iberia
31 Dec - 19 Jan	British Airways
29 Dec - 31 Jan	Delta
01 Dec - 31 Jan	Delta
29 Dec - 12 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 952€

Return flights