AirHint found the following cheapest return flights from San Juan (SJU) to Rio Negro (MDE) in September 2025 (see full year).

Return flights

06 Sep - 16 Sep	Avianca	direct
05 Sep - 10 Sep	Copa
04 Sep - 10 Sep	Copa
05 Sep - 16 Sep	Copa
22 Sep - 25 Sep	Copa
19 Sep - 23 Sep	Copa
19 Sep - 24 Sep	Copa
11 Sep - 15 Sep	Copa
12 Sep - 16 Sep	Copa
23 Sep - 01 Oct	Copa
30 Sep - 14 Oct	Copa
07 Sep - 20 Sep	Avianca	direct
23 Sep - 01 Oct	Avianca	direct
13 Sep - 12 Oct	Copa
12 Sep - 12 Oct	Avianca	direct
25 Sep - 16 Oct	Spirit Airlines
25 Sep - 08 Oct	Spirit Airlines
19 Sep - 08 Oct	Spirit Airlines
18 Sep - 08 Oct	Spirit Airlines
25 Sep - 12 Oct	Spirit Airlines

Also check the deals for one-way flights from San Juan to Rio Negro 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 San Juan to Rio Negro in September from 176€

Return flights