AirHint found the following cheapest one-way flights from Newark (EWR) to San Juan (SJU) in September 2025 (see full year).

One-Way flights

06 Sep	Frontier Airlines	direct
02 Sep	jetBlue	direct
27 Sep	Spirit Airlines
13 Sep	Spirit Airlines
03 Sep	Spirit Airlines
16 Sep	Spirit Airlines
29 Sep	jetBlue	direct
08 Sep	jetBlue	direct
15 Sep	Frontier Airlines	direct
30 Sep	Frontier Airlines	direct

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

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 September from 73€

One-Way flights