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

Return flights

29 Sep - 07 Oct	Avianca
24 Sep - 28 Sep	Avianca
30 Sep - 11 Oct	Avianca
26 Sep - 29 Sep	Avianca
25 Sep - 28 Sep	Avianca
28 Sep - 03 Oct	Avianca
27 Sep - 04 Oct	Avianca
26 Sep - 04 Oct	Avianca
10 Sep - 17 Sep	Avianca
18 Sep - 21 Sep	Avianca
11 Sep - 25 Sep	jetBlue
30 Sep - 14 Oct	Avianca
30 Sep - 09 Oct	Avianca
13 Sep - 19 Sep	Avianca
14 Sep - 19 Sep	Avianca
25 Sep - 02 Oct	Avianca
21 Sep - 25 Sep	Avianca
30 Sep - 04 Oct	Avianca
29 Sep - 04 Oct	Avianca
25 Sep - 29 Sep	Frontier Airlines

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.

Book a cheap hotel in San Jose

Cheap car rent in San Jose

Cheapest return flights from New York to San Jose in September from 175€

Return flights