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

Return flights

09 Dec - 21 Jan	Air Canada
03 Dec - 12 Dec	Air France
05 Dec - 14 Dec	Air Canada
01 Dec - 14 Dec	Air France
04 Dec - 13 Dec	American Airlines
06 Dec - 14 Dec	Air Canada
01 Dec - 07 Dec	Air France
06 Dec - 09 Dec	British Airways
05 Dec - 12 Dec	Air France
03 Dec - 16 Dec	British Airways
08 Dec - 21 Jan	Delta
08 Dec - 14 Jan	Delta
10 Dec - 19 Jan	Delta
10 Dec - 15 Jan	Delta
06 Dec - 13 Dec	Air Canada
31 Dec - 16 Jan	Air France
26 Dec - 23 Jan	Air Canada
28 Dec - 29 Jan	Delta
27 Dec - 23 Jan	Air Canada
24 Dec - 14 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 $1047

Return flights