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

Return flights

08 Sep - 30 Sep	Avianca
01 Sep - 24 Sep	Avianca
10 Sep - 10 Oct	Avianca
08 Sep - 01 Oct	Avianca
07 Sep - 28 Sep	Avianca
08 Sep - 28 Sep	Avianca
02 Sep - 30 Sep	Avianca
02 Sep - 29 Sep	Avianca
03 Sep - 30 Sep	Avianca
15 Sep - 24 Sep	Avianca
08 Sep - 29 Sep	Avianca
15 Sep - 29 Sep	Avianca
01 Sep - 09 Oct	Avianca
01 Sep - 06 Oct	Avianca
24 Sep - 15 Oct	Air France
16 Sep - 12 Oct	Lufthansa
14 Sep - 19 Oct	Lufthansa
23 Sep - 06 Oct	Avianca
27 Sep - 20 Oct	Avianca
06 Sep - 09 Oct	Avianca

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 759€

Return flights