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

Return flights

18 Sep - 22 Sep	Spirit Airlines
18 Sep - 29 Sep	Spirit Airlines
03 Sep - 10 Sep	United
18 Sep - 09 Oct	Spirit Airlines
26 Sep - 10 Oct	Frontier Airlines
16 Sep - 20 Sep	Delta
19 Sep - 22 Sep	United
19 Sep - 23 Sep	United
09 Sep - 13 Sep	United
19 Sep - 29 Sep	Spirit Airlines
05 Sep - 22 Sep	Spirit Airlines
04 Sep - 22 Sep	Spirit Airlines
19 Sep - 09 Oct	Spirit Airlines
18 Sep - 02 Oct	Spirit Airlines
19 Sep - 02 Oct	Spirit Airlines

Also check the deals for one-way 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 return flights from Charlotte to San Juan in September from 233€

Return flights