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

Return flights

29 Sep - 02 Oct	United
25 Sep - 01 Oct	Delta
26 Sep - 28 Sep	Frontier Airlines
28 Sep - 05 Oct	Frontier Airlines
26 Sep - 29 Sep	Frontier Airlines
22 Sep - 01 Oct	Frontier Airlines
22 Sep - 25 Sep	Frontier Airlines
24 Sep - 28 Sep	Frontier Airlines
21 Sep - 03 Oct	Spirit Airlines
21 Sep - 05 Oct	Spirit Airlines
21 Sep - 28 Sep	Frontier Airlines
28 Sep - 16 Oct	Spirit Airlines
21 Sep - 12 Oct	Spirit Airlines
28 Sep - 03 Oct	Spirit Airlines
18 Sep - 19 Sep	Delta
19 Sep - 21 Sep	United
28 Sep - 12 Oct	Spirit Airlines

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 190€

Return flights