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

Return flights

08 Sep - 15 Sep	American Airlines
04 Sep - 11 Sep	United
02 Sep - 16 Sep	United
03 Sep - 17 Sep	United
12 Sep - 26 Sep	United
20 Sep - 24 Sep	United
30 Sep - 14 Oct	United
17 Sep - 01 Oct	United
08 Sep - 13 Sep	United
21 Sep - 24 Sep	United
02 Sep - 13 Sep	United
21 Sep - 26 Sep	Delta
19 Sep - 03 Oct	United
18 Sep - 02 Oct	United
30 Sep - 18 Oct	Spirit Airlines
30 Sep - 09 Oct	Spirit Airlines
20 Sep - 09 Oct	Spirit Airlines
30 Sep - 07 Oct	Spirit Airlines
20 Sep - 07 Oct	Spirit Airlines
30 Sep - 02 Oct	Spirit 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.

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Cheapest return flights from New York to San Jose in September from 228€

Return flights