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

Return flights

24 Sep - 28 Sep	Southwest Airlines
02 Sep - 14 Sep	Southwest Airlines
12 Sep - 15 Sep	Southwest Airlines
26 Sep - 30 Sep	United
05 Sep - 08 Sep	Southwest Airlines
03 Sep - 10 Sep	jetBlue
11 Sep - 15 Sep	Southwest 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 202€

Return flights