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

Return flights

14 Sep - 19 Sep	American Airlines
15 Sep - 19 Sep	American Airlines
14 Sep - 03 Oct	American Airlines
29 Sep - 02 Oct	United
17 Sep - 24 Sep	Southwest Airlines
19 Sep - 22 Sep	Spirit Airlines
26 Sep - 29 Sep	Frontier Airlines
16 Sep - 17 Sep	Frontier Airlines
18 Sep - 19 Sep	Delta
24 Sep - 28 Sep	Frontier Airlines
02 Sep - 03 Oct	Frontier Airlines
25 Sep - 03 Oct	Spirit Airlines
14 Sep - 21 Sep	United
17 Sep - 21 Sep	United

Also check the deals for one-way flights from Cleveland 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 Cleveland to San Juan in September from $225

Return flights