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

Return flights

15 Sep - 22 Sep	Spirit Airlines
02 Sep - 14 Sep	Frontier Airlines
26 Sep - 28 Sep	Frontier Airlines
05 Sep - 07 Sep	Frontier Airlines
18 Sep - 21 Sep	Frontier Airlines
13 Sep - 21 Sep	Southwest Airlines
13 Sep - 22 Sep	Southwest Airlines
01 Sep - 01 Sep	Spirit Airlines
11 Sep - 22 Sep	Frontier Airlines
11 Sep - 14 Sep	Frontier Airlines

Also check the deals for one-way flights from Windsor Locks 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 Windsor Locks to San Juan in September from 238€

Return flights