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

Return flights

02 Dec - 10 Dec	Air Canada
02 Dec - 09 Dec	Iberia
01 Dec - 10 Dec	Iberia
01 Dec - 12 Dec	Air France
03 Dec - 16 Dec	Iberia
05 Dec - 08 Dec	Air Canada
04 Dec - 09 Dec	LATAM Airlines Group
01 Dec - 15 Dec	Air Canada
01 Dec - 13 Dec	Air Canada
05 Dec - 07 Dec	Air Canada
30 Dec - 21 Jan	Delta
04 Dec - 22 Jan	Delta
09 Dec - 14 Jan	Delta
08 Dec - 14 Jan	Delta
12 Dec - 10 Jan	Air Canada
23 Dec - 19 Jan	Iberia
26 Dec - 29 Jan	Iberia
01 Dec - 31 Jan	Air Canada
30 Dec - 18 Jan	Delta
03 Dec - 14 Jan	American Airlines

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 887€

Return flights