Cheapest return flights from Newark to San Juan in September from $157

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

Return flights

07 Sep - 11 Sep Frontier Airlines direct
07 Sep - 17 Sep Frontier Airlines direct
10 Sep - 23 Sep Frontier Airlines direct
19 Sep - 23 Sep Frontier Airlines
17 Sep - 22 Sep Frontier Airlines
09 Sep - 12 Sep Frontier Airlines direct
02 Sep - 06 Sep Frontier Airlines
18 Sep - 23 Sep Frontier Airlines
26 Sep - 03 Oct Frontier Airlines
20 Sep - 24 Sep Frontier Airlines direct
25 Sep - 28 Sep Frontier Airlines
26 Sep - 03 Oct Frontier Airlines direct
20 Sep - 05 Oct Spirit Airlines
20 Sep - 01 Oct Spirit Airlines
20 Sep - 08 Oct Spirit Airlines
20 Sep - 03 Oct Spirit Airlines
24 Sep - 05 Oct Spirit Airlines
24 Sep - 08 Oct Spirit Airlines
24 Sep - 03 Oct Spirit Airlines
14 Sep - 05 Oct Spirit Airlines

Also check the deals for one-way flights from Newark to San Juan in September.

Skyscanner

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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