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

Return flights

02 Dec - 09 Dec	United	direct
03 Dec - 10 Dec	United	direct
05 Dec - 12 Dec	United	direct
05 Dec - 21 Jan	United	direct
04 Dec - 11 Dec	United	direct
08 Dec - 15 Dec	United	direct
08 Dec - 14 Dec	United	direct
06 Dec - 13 Dec	United
01 Dec - 08 Dec	United	direct
09 Dec - 16 Dec	United
10 Dec - 17 Dec	United
28 Dec - 04 Jan	Allegiant Air
08 Dec - 11 Jan	jetBlue
31 Dec - 07 Jan	United	direct
23 Dec - 08 Jan	Allegiant Air
07 Dec - 04 Jan	Aeromexico
30 Dec - 06 Jan	United	direct
29 Dec - 04 Jan	Frontier Airlines
29 Dec - 05 Jan	United	direct
27 Dec - 04 Jan	Frontier Airlines

Also check the deals for one-way flights from Newark to San Jose in December.

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 December from 310€

Return flights