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

Return flights

23 Sep - 28 Sep	Copa
27 Sep - 28 Sep	Copa
25 Sep - 29 Sep	Copa
26 Sep - 01 Oct	Copa
27 Sep - 04 Oct	Copa
25 Sep - 02 Oct	Copa
25 Sep - 29 Sep	Avianca	direct
18 Sep - 23 Sep	Copa
18 Sep - 25 Sep	Copa
19 Sep - 22 Sep	Copa
20 Sep - 24 Sep	Avianca
29 Sep - 03 Oct	Avianca
15 Sep - 18 Sep	Copa
15 Sep - 19 Sep	Avianca
30 Sep - 08 Oct	Avianca
29 Sep - 02 Oct	Spirit Airlines
29 Sep - 05 Oct	Spirit Airlines
29 Sep - 06 Oct	Spirit Airlines
29 Sep - 14 Oct	Spirit Airlines
29 Sep - 11 Oct	Spirit Airlines

Also check the deals for one-way flights from Rio Negro to San Juan 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 Rio Negro to San Juan in September from $254

Return flights