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

Return flights

24 Sep - 30 Sep	United
07 Sep - 11 Sep	United
17 Sep - 24 Sep	Southwest Airlines
14 Sep - 21 Sep	United
14 Sep - 03 Oct	United
04 Sep - 06 Sep	Frontier Airlines
11 Sep - 15 Sep	Frontier Airlines
03 Sep - 10 Sep	Frontier Airlines
03 Sep - 11 Sep	Spirit Airlines
03 Sep - 12 Sep	Spirit Airlines
07 Sep - 14 Sep	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 175€

Return flights