AirHint found the following cheapest one-way flights from Newark (EWR) to San Juan (SJU) in January 2026 (see full year).

One-Way flights

10 Jan	Frontier Airlines	direct
23 Jan	jetBlue	direct
12 Jan	jetBlue	direct
17 Jan	jetBlue	direct
11 Jan	jetBlue	direct
20 Jan	Frontier Airlines	direct
09 Jan	Spirit Airlines
30 Jan	jetBlue	direct
06 Jan	Frontier Airlines	direct
02 Jan	Frontier Airlines	direct

Also check the deals for return flights from Newark to San Juan in January.

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 one-way flights from Newark to San Juan in January from $58

One-Way flights