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

Return flights

28 Sep - 06 Oct	JetSmart
29 Sep - 07 Oct	JetSmart
29 Sep - 08 Oct	JetSmart
25 Sep - 20 Oct	JetSmart
29 Sep - 12 Oct	Aerolineas Argentinas
27 Sep - 05 Oct	Aerolineas Argentinas
29 Sep - 06 Oct	Aerolineas Argentinas
29 Sep - 13 Oct	Sky Airline
29 Sep - 05 Oct	JetSmart
25 Sep - 07 Oct	JetSmart
23 Sep - 30 Sep	LATAM Airlines Group
25 Sep - 29 Sep	Aerolineas Argentinas
20 Sep - 30 Sep	LATAM Airlines Group
27 Sep - 28 Sep	JetSmart
20 Sep - 27 Sep	LATAM Airlines Group
19 Sep - 26 Sep	Avianca

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 1047€

Return flights