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

Return flights

17 Sep - 22 Sep	United	direct
08 Sep - 22 Sep	United	direct
09 Sep - 23 Sep	United	direct
16 Sep - 16 Oct	United	direct
10 Sep - 17 Sep	United
25 Sep - 29 Sep	United
25 Sep - 01 Oct	United
24 Sep - 29 Sep	United
03 Sep - 17 Sep	United
10 Sep - 24 Sep	United
11 Sep - 25 Sep	United
12 Sep - 26 Sep	United
17 Sep - 01 Oct	United
25 Sep - 09 Oct	United
20 Sep - 04 Oct	United
23 Sep - 07 Oct	United
24 Sep - 08 Oct	United
30 Sep - 14 Oct	United
26 Sep - 10 Oct	United	direct
29 Sep - 16 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.

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Cheapest return flights from Newark to San Jose in September from 188€

Return flights