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

Return flights

23 Sep - 07 Oct	TAP
23 Sep - 29 Sep	Air Europa
22 Sep - 02 Oct	Norse Atlantic Airways (UK)
03 Sep - 13 Oct	TAP
06 Sep - 27 Sep	Norse Atlantic Airways (UK)
26 Sep - 13 Oct	TAP
21 Sep - 19 Oct	TAP
22 Sep - 27 Sep	Air Europa
30 Sep - 14 Oct	TAP
08 Sep - 15 Sep	TAP
24 Sep - 30 Sep	Air Europa
19 Sep - 14 Oct	TAP
08 Sep - 29 Sep	Norse Atlantic Airways (UK)
21 Sep - 12 Oct	easyJet
08 Sep - 14 Oct	Norse Atlantic Airways (UK)
22 Sep - 29 Sep	Air Europa
19 Sep - 28 Sep	Air Europa
14 Sep - 30 Sep	TAP
29 Sep - 08 Oct	Norse Atlantic Airways (UK)
20 Sep - 30 Sep	Norse Atlantic Airways (UK)

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 855€

Return flights