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

Return flights

24 Sep - 29 Sep	Avianca
03 Sep - 08 Sep	Avianca
01 Sep - 07 Sep	Avianca
18 Sep - 25 Sep	Avianca
29 Sep - 06 Oct	Avianca
02 Sep - 13 Sep	Avianca
08 Sep - 29 Sep	Avianca
23 Sep - 03 Oct	Avianca
05 Sep - 14 Sep	Avianca
11 Sep - 14 Sep	Avianca
12 Sep - 18 Sep	JetSmart
13 Sep - 21 Sep	JetSmart

Also check the deals for one-way flights from Santiago 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 Santiago to San Juan in September from 345€

Return flights