Cheapest return flights from Philadelphia to San Juan in July from $380

Best time to book flights for Philadelphia (PHL) to San Juan (SJU) flights at AirHint

AirHint found the following cheapest return flights from Philadelphia (PHL) to San Juan (SJU) in July 2025 (see full year).

Return flights

04 Jul - 11 Jul Frontier Airlines direct
01 Jul - 08 Jul Frontier Airlines direct
19 Jul - 26 Jul Frontier Airlines direct
10 Jul - 22 Jul Frontier Airlines direct
16 Jul - 22 Jul Frontier Airlines direct
20 Jul - 27 Jul Frontier Airlines direct
12 Jul - 19 Jul Frontier Airlines direct
11 Jul - 19 Jul Frontier Airlines direct
13 Jul - 22 Jul Frontier Airlines direct
31 Jul - 08 Aug Frontier Airlines direct
04 Jul - 06 Jul Frontier Airlines direct

Also check the deals for one-way flights from Philadelphia to San Juan in July.

Skyscanner

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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