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
09 Dec - 18 Dec	Ryanair
07 Dec - 17 Dec	Ryanair
07 Dec - 16 Dec	Ryanair
09 Dec - 19 Dec	Ryanair
15 Dec - 12 Jan	Ryanair
22 Dec - 24 Jan	Ryanair
08 Dec - 02 Jan	Ryanair
23 Dec - 02 Jan	Ryanair
15 Dec - 08 Jan	Ryanair
15 Dec - 07 Jan	Ryanair
18 Dec - 03 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.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from London to Buenos Aires in December from $1214

Return flights