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

Return flights

03 Sep - 13 Sep	Avianca
08 Sep - 13 Sep	Avianca
02 Sep - 13 Sep	Avianca
25 Sep - 04 Oct	Avianca
04 Sep - 11 Sep	Avianca
10 Sep - 13 Sep	Avianca
08 Sep - 25 Sep	Avianca
04 Sep - 08 Sep	Avianca
11 Sep - 14 Sep	jetBlue	direct
20 Sep - 28 Sep	Avianca
04 Sep - 14 Sep	Avianca
19 Sep - 13 Oct	Avianca
26 Sep - 10 Oct	Avianca
10 Sep - 01 Oct	Avianca
17 Sep - 01 Oct	Avianca
23 Sep - 07 Oct	Avianca
24 Sep - 08 Oct	Avianca
29 Sep - 06 Oct	Avianca
30 Sep - 14 Oct	Avianca
08 Sep - 01 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 124€

Return flights