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

Return flights

04 Sep - 14 Sep	Avianca
25 Sep - 29 Sep	Avianca
19 Sep - 28 Sep	Avianca
29 Sep - 06 Oct	Avianca
28 Sep - 01 Oct	Avianca
29 Sep - 02 Oct	Avianca
26 Sep - 05 Oct	Avianca
26 Sep - 29 Sep	Avianca
11 Sep - 25 Sep	Avianca
19 Sep - 22 Sep	Avianca
29 Sep - 05 Oct	Avianca
28 Sep - 03 Oct	Avianca
15 Sep - 19 Sep	Avianca
18 Sep - 21 Sep	Avianca
20 Sep - 28 Sep	Avianca
15 Sep - 20 Sep	Avianca
27 Sep - 06 Oct	Avianca
27 Sep - 25 Oct	jetBlue
26 Sep - 04 Oct	Avianca

Also check the deals for one-way flights from New York to San Jose 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 San Jose in September from 192€

Return flights