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

Return flights

08 Sep - 13 Sep	Avianca
25 Sep - 04 Oct	Avianca
03 Sep - 13 Sep	Avianca
10 Sep - 13 Sep	Avianca
02 Sep - 13 Sep	Avianca
04 Sep - 11 Sep	Avianca
04 Sep - 08 Sep	Avianca
08 Sep - 25 Sep	Avianca
14 Sep - 21 Sep	United	direct
18 Sep - 25 Sep	United	direct
03 Sep - 17 Sep	United	direct
17 Sep - 01 Oct	United	direct
18 Sep - 02 Oct	United	direct
19 Sep - 03 Oct	United	direct
21 Sep - 05 Oct	United	direct
23 Sep - 07 Oct	United	direct
24 Sep - 08 Oct	United	direct
25 Sep - 09 Oct	United	direct
26 Sep - 10 Oct	United
20 Sep - 04 Oct	United

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 131€

Return flights