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

Return flights

02 Sep - 29 Sep	Air Canada
10 Sep - 24 Sep	Air Canada
10 Sep - 25 Sep	Air Canada
08 Sep - 23 Sep	United
01 Sep - 16 Sep	Avianca
03 Sep - 30 Sep	Avianca
12 Sep - 27 Sep	Air Canada
15 Sep - 29 Sep	United
08 Sep - 21 Sep	Delta
05 Sep - 14 Sep	Delta
25 Sep - 13 Oct	Delta
15 Sep - 04 Oct	Delta
08 Sep - 04 Oct	Delta
25 Sep - 17 Oct	British Airways
25 Sep - 11 Oct	British Airways
18 Sep - 02 Oct	Delta
26 Sep - 18 Oct	Delta
27 Sep - 04 Oct	Delta
13 Sep - 11 Oct	Delta
27 Sep - 11 Oct	British Airways

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 $1102

Return flights