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

Return flights

01 Sep - 09 Oct	Avianca
09 Sep - 30 Sep	Avianca
15 Sep - 23 Sep	Avianca
03 Sep - 30 Sep	Avianca
15 Sep - 02 Oct	Avianca
15 Sep - 26 Sep	Avianca
01 Sep - 08 Sep	Avianca
02 Sep - 29 Sep	Avianca
15 Sep - 29 Sep	Avianca
15 Sep - 28 Sep	Avianca
10 Sep - 23 Sep	Avianca
09 Sep - 03 Oct	Avianca
01 Sep - 11 Sep	Avianca
07 Sep - 03 Oct	Avianca
01 Sep - 31 Oct	Avianca
08 Sep - 03 Oct	Avianca
09 Sep - 04 Oct	Avianca
14 Sep - 19 Oct	Lufthansa
03 Sep - 11 Oct	Air France
03 Sep - 08 Oct	Lufthansa

Also check the deals for one-way flights from London to Buenos Aires 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 London to Buenos Aires in September from 829€

Return flights