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Cheapest one-way flights from Philadelphia (PHL) to San Juan (SJU), December

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Dates, airline, and price
Dates	Airline	Price
17 Dec	Frontier Airlines Direct Flight
29 Dec	Frontier Airlines Direct Flight
19 Dec	Frontier Airlines Direct Flight
23 Dec	Allegiant Air
24 Dec	Frontier Airlines
23 Dec	Frontier Airlines Direct Flight
24 Dec	Frontier Airlines Direct Flight
10 Dec	Frontier Airlines Direct Flight
18 Dec	Frontier Airlines Direct Flight

deals for return flights from Philadelphia to San Juan in December.

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Updated Jul 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 one-way flights from Philadelphia (PHL) to San Juan (SJU), December

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