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

Return flights

26 Sep - 28 Sep	Finnair
14 Sep - 20 Sep	Finnair
12 Sep - 26 Sep	Finnair
14 Sep - 27 Sep	Finnair
14 Sep - 30 Sep	Finnair
17 Sep - 30 Sep	Finnair
16 Sep - 30 Sep	Finnair
13 Sep - 27 Sep	Finnair
16 Sep - 21 Sep	Finnair
12 Sep - 27 Sep	Finnair
10 Sep - 08 Oct	Finnair
26 Sep - 07 Oct	Finnair
16 Sep - 14 Oct	Finnair
09 Sep - 11 Oct	Finnair
23 Sep - 26 Oct	Finnair
24 Sep - 07 Oct	American Airlines
22 Sep - 04 Oct	American Airlines
26 Sep - 13 Oct	American Airlines
16 Sep - 02 Oct	American Airlines
19 Sep - 04 Oct	American Airlines

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 929€

Return flights