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

Return flights

10 Sep - 07 Oct	easyJet
29 Sep - 06 Oct	easyJet
18 Sep - 06 Oct	easyJet
22 Sep - 06 Oct	easyJet
11 Sep - 25 Sep	Ryanair
05 Sep - 08 Oct	easyJet
11 Sep - 23 Sep	Ryanair
25 Sep - 02 Oct	easyJet
09 Sep - 30 Sep	easyJet
11 Sep - 18 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
10 Sep - 29 Sep	easyJet
03 Sep - 30 Sep	easyJet
05 Sep - 30 Sep	easyJet
09 Sep - 29 Sep	easyJet
04 Sep - 25 Sep	Ryanair
26 Sep - 05 Oct	easyJet
30 Sep - 19 Oct	easyJet
25 Sep - 05 Oct	easyJet
28 Sep - 05 Oct	easyJet

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 $1137

Return flights