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

Return flights

19 Sep - 30 Sep	JetSmart
19 Sep - 23 Sep	JetSmart
26 Sep - 04 Oct	JetSmart
19 Sep - 26 Sep	JetSmart
21 Sep - 28 Sep	JetSmart
19 Sep - 28 Sep	JetSmart
10 Sep - 14 Sep	JetSmart
28 Sep - 05 Oct	JetSmart
13 Sep - 21 Sep	Copa
17 Sep - 26 Sep	JetSmart
18 Sep - 22 Sep	LATAM Airlines Group
04 Sep - 08 Sep	LATAM Airlines Group
15 Sep - 31 Oct	LATAM Airlines Group
06 Sep - 01 Oct	LATAM Airlines Group
25 Sep - 05 Oct	LATAM Airlines Group
20 Sep - 01 Oct	Avianca
27 Sep - 06 Oct	Avianca

Also check the deals for one-way flights from Quito 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 Quito to Buenos Aires in September from 414€

Return flights