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

Return flights

02 Dec - 11 Dec	Ryanair
05 Dec - 11 Dec	Ryanair
12 Dec - 25 Jan	Ryanair
11 Dec - 24 Jan	Ryanair
09 Dec - 18 Dec	Ryanair
12 Dec - 15 Dec	Ryanair
13 Dec - 24 Jan	Ryanair
05 Dec - 20 Dec	Ryanair
27 Dec - 27 Jan	Ryanair
06 Dec - 18 Jan	Ryanair
08 Dec - 20 Dec	Ryanair
15 Dec - 27 Dec	Ryanair
02 Dec - 19 Dec	Ryanair
05 Dec - 18 Jan	Ryanair
12 Dec - 21 Dec	Ryanair
11 Dec - 10 Jan	Ryanair
29 Dec - 17 Jan	Ryanair
12 Dec - 10 Jan	Ryanair
12 Dec - 19 Dec	Ryanair
29 Dec - 15 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 979€

Return flights