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

Return flights

04 Dec - 09 Dec	United	direct
07 Dec - 14 Dec	jetBlue
10 Dec - 19 Dec	American Airlines
07 Dec - 14 Dec	United	direct
15 Dec - 22 Dec	American Airlines
13 Dec - 21 Dec	Air Canada
13 Dec - 22 Dec	American Airlines
14 Dec - 22 Dec	American Airlines
13 Dec - 19 Dec	American Airlines
29 Dec - 06 Jan	jetBlue
25 Dec - 31 Dec	Volaris El Salvador
27 Dec - 06 Jan	Allegiant Air
23 Dec - 06 Jan	jetBlue
29 Dec - 05 Jan	jetBlue
26 Dec - 06 Jan	Arajet
29 Dec - 06 Jan	United	direct
25 Dec - 01 Jan	Volaris El Salvador
29 Dec - 05 Jan	United	direct
26 Dec - 05 Jan	Arajet
20 Dec - 03 Jan	Allegiant Air

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.

Book a cheap hotel in San Jose

Cheap car rent in San Jose

Cheapest return flights from Newark to San Jose in December from $438

Return flights