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

Return flights

01 Dec - 15 Dec	Air Europa
02 Dec - 24 Jan	Air Canada
07 Dec - 14 Jan	Air Canada
09 Dec - 16 Dec	Air Europa
04 Dec - 19 Dec	Air Europa
04 Dec - 21 Dec	Air Europa
16 Dec - 30 Dec	Vueling Airlines
07 Dec - 11 Dec	Vueling Airlines
06 Dec - 13 Dec	easyJet
13 Dec - 24 Jan	Vueling Airlines
01 Dec - 30 Dec	ITA Airways
11 Dec - 12 Jan	Wizz Air UK
15 Dec - 30 Dec	Ryanair
08 Dec - 20 Dec	Air Europa
11 Dec - 14 Jan	Air Canada
13 Dec - 17 Jan	Wizz Air UK
28 Dec - 10 Jan	LATAM Airlines Group
31 Dec - 17 Jan	Ryanair
12 Dec - 17 Jan	Ryanair
13 Dec - 18 Jan	Vueling 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 956€

Return flights