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

Return flights

10 Sep - 17 Sep	United	direct
11 Sep - 18 Sep	United	direct
13 Sep - 20 Sep	United	direct
21 Sep - 28 Sep	United	direct
03 Sep - 10 Sep	United	direct
17 Sep - 24 Sep	United	direct
26 Sep - 28 Sep	United	direct
14 Sep - 21 Sep	United	direct
22 Sep - 29 Sep	United	direct
23 Sep - 30 Sep	United	direct
24 Sep - 01 Oct	United	direct
25 Sep - 02 Oct	United	direct
26 Sep - 03 Oct	United	direct
26 Sep - 10 Oct	United	direct
17 Sep - 01 Oct	United	direct
23 Sep - 07 Oct	United	direct
25 Sep - 09 Oct	United	direct
29 Sep - 13 Oct	United	direct
27 Sep - 04 Oct	United
30 Sep - 07 Oct	United

Also check the deals for one-way flights from Newark 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 Newark to San Jose in September from 206€

Return flights