Cheapest return flights from St. Louis to San Juan in April from $188

Best time to book flights for St. Louis (STL) to San Juan (SJU) flights at AirHint

AirHint found the following cheapest return flights from St. Louis (STL) to San Juan (SJU) in April 2025 (see full year).

Return flights

02 Apr - 07 Apr Frontier Airlines
02 Apr - 09 Apr Frontier Airlines
01 Apr - 05 Apr Frontier Airlines
26 Apr - 03 May Frontier Airlines
27 Apr - 04 May Frontier Airlines
10 Apr - 15 Apr Frontier Airlines
14 Apr - 20 Apr Frontier Airlines
17 Apr - 21 Apr Frontier Airlines
03 Apr - 07 Apr American Airlines

Also check the deals for one-way flights from St. Louis to San Juan in April.

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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