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

Return flights

07 Dec - 13 Dec	Frontier Airlines
11 Dec - 24 Dec	Frontier Airlines
11 Dec - 22 Dec	Frontier Airlines
11 Dec - 20 Dec	Frontier Airlines
04 Dec - 13 Dec	Frontier Airlines
12 Dec - 21 Dec	Frontier Airlines
13 Dec - 21 Dec	Frontier Airlines
18 Dec - 24 Dec	Frontier Airlines
30 Dec - 11 Jan	Frontier Airlines
18 Dec - 21 Dec	Frontier Airlines
23 Dec - 30 Dec	Frontier Airlines
30 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Trenton 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 Trenton to San Jose in December from 303€

Return flights