Cheapest return flights from St. Louis to San Juan in April from $202

AirHint found the following cheapest return flights from St. Louis (STL) to San Juan (SJU) in April 2026 (see full year).

Return flights

17 Apr - 22 Apr Frontier Airlines
10 Apr - 13 Apr Frontier Airlines
25 Apr - 28 Apr Frontier Airlines
07 Apr - 14 Apr Frontier Airlines
07 Apr - 15 Apr Frontier Airlines
08 Apr - 15 Apr Frontier Airlines
08 Apr - 12 Apr Frontier Airlines
16 Apr - 19 Apr Frontier Airlines
21 Apr - 24 Apr Frontier Airlines
24 Apr - 01 May Frontier Airlines
24 Apr - 02 May Frontier Airlines
03 Apr - 10 Apr American Airlines
30 Apr - 03 May Frontier Airlines

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

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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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