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

One-Way flights

20 Sep	Spirit Airlines
30 Sep	Spirit Airlines
19 Sep	Spirit Airlines
29 Sep	Spirit Airlines
22 Sep	Spirit Airlines
21 Sep	Spirit Airlines
05 Sep	Frontier Airlines
09 Sep	Spirit Airlines
25 Sep	Spirit Airlines
04 Sep	Frontier Airlines

Also check the deals for return flights from Charlotte 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 Charlotte to San Juan in September from $102

One-Way flights