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

Return flights

14 Sep - 16 Sep	jetBlue	direct
09 Sep - 16 Sep	jetBlue	direct
08 Sep - 15 Sep	Avianca
15 Sep - 19 Sep	Avianca
08 Sep - 17 Sep	Avianca
16 Sep - 20 Oct	Avianca
16 Sep - 16 Oct	Avianca
01 Sep - 23 Sep	Avianca
01 Sep - 23 Sep	jetBlue	direct
26 Sep - 03 Oct	jetBlue	direct
05 Sep - 12 Sep	jetBlue	direct
05 Sep - 17 Sep	Avianca
20 Sep - 09 Oct	Avianca
17 Sep - 22 Sep	Copa
29 Sep - 16 Oct	Delta

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 196€

Return flights