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

Return flights

10 Sep - 14 Sep	Avianca
09 Sep - 19 Sep	Avianca
03 Sep - 06 Sep	Avianca
04 Sep - 07 Sep	Avianca
11 Sep - 15 Sep	Avianca
03 Sep - 07 Sep	Avianca
25 Sep - 09 Oct	Avianca
08 Sep - 12 Sep	Avianca
11 Sep - 16 Sep	Avianca
06 Sep - 01 Oct	Avianca	direct
18 Sep - 26 Sep	Avianca
16 Sep - 18 Sep	Avianca
30 Sep - 06 Oct	Avianca
26 Sep - 02 Oct	Avianca
30 Sep - 07 Oct	Avianca
27 Sep - 06 Oct	Avianca
27 Sep - 01 Oct	Avianca
21 Sep - 01 Oct	Avianca
26 Sep - 04 Oct	Avianca
15 Sep - 31 Oct	LATAM Airlines Group

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 $458

Return flights