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

Return flights

09 Sep - 21 Oct	ITA Airways
01 Sep - 30 Oct	ITA Airways
22 Sep - 30 Sep	Delta
01 Sep - 07 Sep	Delta
14 Sep - 30 Sep	Delta
24 Sep - 08 Oct	Delta
11 Sep - 27 Sep	Delta
10 Sep - 13 Sep	Delta
23 Sep - 24 Oct	ITA Airways
06 Sep - 13 Sep	Delta
08 Sep - 06 Oct	KLM
03 Sep - 30 Sep	KLM
05 Sep - 19 Sep	ITA Airways
02 Sep - 16 Sep	ITA Airways
02 Sep - 09 Sep	ITA Airways
26 Sep - 31 Oct	ITA Airways
26 Sep - 30 Oct	ITA Airways
22 Sep - 03 Oct	KLM
19 Sep - 05 Oct	KLM
27 Sep - 11 Oct	Delta

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 $1372

Return flights