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Cheapest return flights from Philadelphia (PHL) to San Juan (SJU), September

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Dates, airline, and price
Dates	Airline	Price
07 Sep 11 Sep	Frontier Airlines Direct Flight
25 Sep 30 Sep	Frontier Airlines Direct Flight
11 Sep 13 Sep	Frontier Airlines Direct Flight
01 Sep 06 Sep	Frontier Airlines

deals for one-way flights from Philadelphia to San Juan in September.

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Updated May 23, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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Cheapest return flights from Philadelphia (PHL) to San Juan (SJU), September

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