AirHint found the following cheapest return flights from Philadelphia (PHL) to St. Croix Island (STX) in March 2026 (see full year).

Return flights

28 Mar - 13 Apr	Spirit Airlines
28 Mar - 03 Apr	Spirit Airlines
16 Mar - 28 Mar	Spirit Airlines
12 Mar - 17 Mar	Delta
07 Mar - 16 Mar	Spirit Airlines
16 Mar - 03 Apr	Spirit Airlines
28 Mar - 06 Apr	Spirit Airlines
07 Mar - 20 Mar	Spirit Airlines
16 Mar - 20 Mar	Spirit Airlines
17 Mar - 21 Mar	Spirit Airlines
13 Mar - 28 Mar	Spirit Airlines
13 Mar - 20 Mar	Spirit Airlines
07 Mar - 13 Mar	Spirit Airlines
13 Mar - 16 Mar	Spirit Airlines

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

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 March from 363€

Return flights