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

Return flights

25 Sep - 08 Oct	Aerolineas Argentinas
30 Sep - 08 Oct	GOL Linhas Aéreas
24 Sep - 09 Oct	SWISS
10 Sep - 23 Sep	SWISS
13 Sep - 16 Oct	SWISS
03 Sep - 23 Sep	SWISS
10 Sep - 25 Sep	SWISS
20 Sep - 07 Oct	SWISS

Also check the deals for one-way flights from Buenos Aires to London in September.

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 Buenos Aires to London in September from $1618

Return flights