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

Return flights

16 Sep - 08 Oct	SWISS
15 Sep - 27 Oct	Vueling Airlines
11 Sep - 21 Sep	Norse Atlantic Airways (UK)
14 Sep - 19 Oct	Air Europa
23 Sep - 25 Sep	easyJet
23 Sep - 27 Sep	easyJet
23 Sep - 29 Sep	Air Europa
11 Sep - 23 Sep	Norse Atlantic Airways (UK)
19 Sep - 03 Oct	Air Transat
26 Sep - 05 Oct	Norse Atlantic Airways (UK)
17 Sep - 22 Sep	easyJet
26 Sep - 11 Oct	Norse Atlantic Airways (UK)
15 Sep - 23 Sep	Vueling Airlines
25 Sep - 01 Oct	Vueling Airlines
26 Sep - 29 Sep	Norse Atlantic Airways (UK)
10 Sep - 20 Sep	easyJet
10 Sep - 18 Sep	American Airlines
30 Sep - 05 Oct	American Airlines
30 Sep - 14 Oct	American Airlines
21 Sep - 03 Oct	Air Transat

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 905€

Return flights