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

Return flights

02 Dec - 10 Dec	Avianca
02 Dec - 16 Dec	Avianca
01 Dec - 10 Dec	LATAM Airlines Group
03 Dec - 11 Dec	LATAM Airlines Group
02 Dec - 15 Dec	Avianca
01 Dec - 09 Dec	LATAM Airlines Group
02 Dec - 09 Dec	LATAM Airlines Group
04 Dec - 08 Dec	Air France
01 Dec - 11 Dec	SWISS
01 Dec - 15 Dec	Avianca
24 Dec - 27 Jan	Vueling Airlines
24 Dec - 21 Jan	Vueling Airlines
30 Dec - 26 Jan	Avianca
04 Dec - 19 Jan	TAP
24 Dec - 13 Jan	Vueling Airlines
01 Dec - 18 Jan	SWISS
24 Dec - 16 Jan	Vueling Airlines
30 Dec - 19 Jan	Avianca
11 Dec - 26 Jan	Air Canada
25 Dec - 18 Jan	TAP

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 930€

Return flights