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

Return flights

31 Dec - 28 Jan	Ryanair
31 Dec - 22 Jan	Ryanair
31 Dec - 21 Jan	Ryanair
26 Dec - 26 Jan	Wizz Air UK
26 Dec - 20 Jan	LATAM Airlines Group
27 Dec - 19 Jan	Ryanair
31 Dec - 14 Jan	Ryanair
31 Dec - 18 Jan	Ryanair
28 Dec - 24 Jan	Ryanair
31 Dec - 15 Jan	Ryanair
25 Dec - 31 Dec	Air France
27 Dec - 28 Dec	Air Europa
24 Dec - 30 Dec	easyJet
24 Dec - 31 Dec	Vueling Airlines
25 Dec - 28 Dec	Air France
23 Dec - 28 Dec	easyJet
21 Dec - 24 Dec	SWISS
21 Dec - 29 Dec	KLM
21 Dec - 31 Dec	Air France
26 Dec - 28 Dec	easyJet

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 1103€

Return flights