AirHint found the following cheapest return flights from Philadelphia (PHL) to San Juan (SJU) in March 2026 (see full year).

Return flights

01 Mar - 05 Mar	Frontier Airlines	direct
23 Mar - 31 Mar	Delta
24 Mar - 31 Mar	Delta
18 Mar - 25 Mar	United
14 Mar - 18 Mar	United
13 Mar - 18 Mar	Southwest Airlines
21 Mar - 29 Mar	Southwest Airlines
12 Mar - 12 Mar	United
28 Mar - 03 Apr	Southwest Airlines
12 Mar - 15 Mar	Southwest Airlines
14 Mar - 22 Mar	Southwest Airlines

Also check the deals for one-way flights from Philadelphia to San Juan 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 San Juan in March from 176€

Return flights