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

Return flights

01 Dec - 12 Dec	Ryanair
01 Dec - 10 Dec	Ryanair
01 Dec - 09 Dec	Ryanair
02 Dec - 12 Dec	Ryanair
04 Dec - 11 Dec	Ryanair
01 Dec - 15 Dec	Ryanair
06 Dec - 08 Dec	Ryanair
02 Dec - 16 Dec	Ryanair
03 Dec - 17 Dec	Ryanair
03 Dec - 10 Dec	Ryanair
05 Dec - 19 Jan	Ryanair
11 Dec - 19 Jan	Ryanair
06 Dec - 19 Jan	Ryanair
31 Dec - 31 Jan	Ryanair
29 Dec - 19 Jan	Ryanair
06 Dec - 18 Jan	Ryanair
10 Dec - 16 Jan	Ryanair
31 Dec - 11 Jan	Ryanair
30 Dec - 18 Jan	Ryanair
22 Dec - 19 Jan	Ryanair

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 926€

Return flights