AirHint found the following cheapest return flights from Newark (EWR) to San Jose (SJO) in September 2026 (see full year).
Return flights
| 09 Sep - 19 Sep | United | direct | |
| 06 Sep - 15 Sep | Frontier Airlines | ||
| 06 Sep - 14 Sep | United | direct | |
| 17 Sep - 23 Sep | United | ||
| 25 Sep - 30 Sep | United | direct | |
| 04 Sep - 08 Sep | United | direct |
Also check the deals for one-way flights from Newark to San Jose in September.
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