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

One-Way flights

14 Sep	Frontier Airlines
07 Sep	Frontier Airlines
15 Sep	Spirit Airlines
13 Sep	Spirit Airlines
19 Sep	Spirit Airlines
18 Sep	Frontier Airlines
26 Sep	Frontier Airlines
25 Sep	Spirit Airlines
02 Sep	Spirit Airlines
01 Sep	Spirit 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 75€

One-Way flights