Cheapest return EWR–SJU flights, September

AirHint found the following cheapest return flights from Newark (EWR) to San Juan (SJU) in September 2026 (see full year).

Return flights

01 Sep - 09 Sep Frontier Airlines
01 Sep - 12 Sep Frontier Airlines
02 Sep - 09 Sep Frontier Airlines
22 Sep - 25 Sep Frontier Airlines
17 Sep - 21 Sep Frontier Airlines
19 Sep - 21 Sep Frontier Airlines
04 Sep - 12 Sep Frontier Airlines
13 Sep - 16 Sep Frontier Airlines
17 Sep - 20 Sep Frontier Airlines
07 Sep - 12 Sep Frontier Airlines
30 Sep - 04 Oct United direct
24 Sep - 05 Oct Delta

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

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