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

Return flights

07 Dec - 14 Jan	Air Canada
02 Dec - 24 Jan	Air Canada
08 Dec - 12 Dec	Air Europa
02 Dec - 12 Dec	Air Europa
07 Dec - 11 Dec	Air Europa
01 Dec - 15 Dec	Air Europa
06 Dec - 13 Dec	Air Europa
11 Dec - 14 Jan	Air Canada
09 Dec - 16 Dec	Air Europa
29 Dec - 19 Jan	Iberia
01 Dec - 19 Dec	Iberia
29 Dec - 15 Jan	Air Europa
03 Dec - 18 Dec	Iberia
30 Dec - 11 Jan	Iberia For Level
28 Dec - 13 Jan	Iberia For Level
31 Dec - 17 Jan	Iberia For Level
05 Dec - 17 Dec	Iberia
05 Dec - 21 Dec	Iberia
27 Dec - 15 Jan	Iberia For Level
29 Dec - 04 Jan	Iberia For Level

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 832€

Return flights