AirHint found the following cheapest one-way flights from Fort Lauderdale (FLL) to San Juan (SJU) in September 2025 (see full year).

One-Way flights

15 Sep	Spirit Airlines	direct
08 Sep	Spirit Airlines	direct
22 Sep	Spirit Airlines	direct
29 Sep	Spirit Airlines	direct
25 Sep	Spirit Airlines	direct
01 Sep	Frontier Airlines	direct
20 Sep	Spirit Airlines
13 Sep	Spirit Airlines
06 Sep	Spirit Airlines
11 Sep	Spirit Airlines

Also check the deals for return flights from Fort Lauderdale 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 one-way flights from Fort Lauderdale to San Juan in September from 52€

One-Way flights