AirHint found the following cheapest return flights from Philadelphia (PHL) to St. Croix Island (STX) in July 2025 (see full year).

Return flights

13 Jul - 17 Jul	Frontier Airlines
19 Jul - 24 Jul	Frontier Airlines
20 Jul - 27 Jul	Frontier Airlines
16 Jul - 20 Jul	Frontier Airlines
06 Jul - 13 Jul	Frontier Airlines
16 Jul - 17 Jul	Spirit Airlines
20 Jul - 24 Jul	Spirit Airlines
16 Jul - 24 Jul	Spirit Airlines
20 Jul - 08 Aug	Spirit Airlines
20 Jul - 02 Aug	Spirit Airlines
16 Jul - 02 Aug	Spirit Airlines
16 Jul - 18 Jul	Spirit Airlines
19 Jul - 08 Aug	Spirit Airlines
19 Jul - 02 Aug	Spirit Airlines
16 Jul - 27 Jul	Spirit Airlines
13 Jul - 02 Aug	Spirit Airlines
14 Jul - 02 Aug	Spirit Airlines

Also check the deals for one-way flights from Philadelphia to St. Croix Island in July.

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 Philadelphia to St. Croix Island in July from 144€

Return flights