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

Return flights

01 Sep - 10 Sep	United	direct
06 Sep - 11 Sep	United	direct
06 Sep - 16 Oct	United	direct
26 Sep - 03 Oct	United	direct
25 Sep - 10 Oct	United	direct
16 Sep - 21 Sep	jetBlue	direct
19 Sep - 26 Sep	United	direct
18 Sep - 27 Sep	United	direct
04 Sep - 11 Sep	United	direct
03 Sep - 03 Sep	Spirit Airlines
02 Sep - 07 Sep	Spirit Airlines
03 Sep - 06 Sep	Spirit Airlines
02 Sep - 07 Sep	United	direct

Also check the deals for one-way 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 return flights from Newark to San Juan in September from 201€

Return flights