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

Return flights

16 Sep - 07 Oct	WestJet
03 Sep - 24 Sep	Ryanair
22 Sep - 07 Oct	Vueling Airlines
16 Sep - 04 Oct	Ryanair
23 Sep - 27 Sep	Ryanair
13 Sep - 27 Sep	Aer Lingus
04 Sep - 15 Sep	Ryanair
29 Sep - 05 Oct	Ryanair
03 Sep - 07 Sep	Ryanair
23 Sep - 07 Oct	Aer Lingus
02 Sep - 15 Sep	Iberia Express
16 Sep - 23 Sep	Ryanair
28 Sep - 11 Oct	TAP
03 Sep - 20 Sep	Ryanair
16 Sep - 29 Sep	Ryanair
17 Sep - 01 Oct	Aer Lingus
22 Sep - 29 Sep	Ryanair
30 Sep - 11 Oct	Ryanair
20 Sep - 06 Oct	Aer Lingus
09 Sep - 11 Oct	SWISS

Also check the deals for one-way flights from Dublin 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 Dublin to Buenos Aires in September from $1090

Return flights