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

Return flights

19 Sep - 27 Sep	Avianca
22 Sep - 13 Oct	LATAM Airlines Group
25 Sep - 12 Oct	LATAM Airlines Group
19 Sep - 26 Sep	Avianca
25 Sep - 07 Oct	Aerolineas Argentinas
25 Sep - 29 Sep	Flybondi
29 Sep - 05 Oct	LATAM Airlines Group
25 Sep - 10 Oct	LATAM Airlines Group
20 Sep - 27 Sep	LATAM Airlines Group
30 Sep - 07 Oct	Flybondi
25 Sep - 05 Oct	Flybondi
26 Sep - 03 Oct	Flybondi
26 Sep - 27 Oct	Flybondi
22 Sep - 01 Oct	LATAM Airlines Group
23 Sep - 30 Sep	JetSmart
20 Sep - 30 Sep	LATAM Airlines Group
27 Sep - 28 Sep	GOL Linhas Aéreas

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 1233€

Return flights