AirHint found the following cheapest return flights from New York (JFK) to Santiago (SCL) in September 2025 (see full year).

Return flights

16 Sep - 24 Sep	Frontier Airlines
13 Sep - 20 Sep	Frontier Airlines
16 Sep - 30 Sep	Frontier Airlines
14 Sep - 22 Sep	Frontier Airlines
12 Sep - 21 Sep	Frontier Airlines
11 Sep - 23 Sep	Frontier Airlines
01 Sep - 17 Sep	Frontier Airlines
12 Sep - 19 Sep	Frontier Airlines
15 Sep - 29 Sep	Copa
10 Sep - 19 Sep	Copa
25 Sep - 02 Oct	Copa
28 Sep - 13 Oct	Frontier Airlines
18 Sep - 02 Oct	Delta

Also check the deals for one-way flights from New York to Santiago 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 New York to Santiago in September from 443€

Return flights