Cheapest return flights from St. Louis to San Juan in July from $241

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

Return flights

25 Jul - 06 Aug Spirit Airlines
19 Jul - 31 Jul Spirit Airlines
12 Jul - 31 Jul Spirit Airlines
12 Jul - 18 Jul Frontier Airlines
14 Jul - 17 Jul Frontier Airlines
19 Jul - 08 Aug Spirit Airlines
12 Jul - 19 Jul Frontier Airlines
17 Jul - 20 Jul Frontier Airlines
25 Jul - 05 Aug Spirit Airlines
12 Jul - 20 Jul Spirit Airlines
20 Jul - 23 Jul Spirit Airlines
19 Jul - 02 Aug Spirit Airlines
27 Jul - 06 Aug Spirit Airlines
19 Jul - 20 Jul Spirit Airlines
18 Jul - 21 Jul Frontier Airlines
12 Jul - 02 Aug Spirit Airlines
20 Jul - 08 Aug Spirit Airlines
19 Jul - 03 Aug Spirit Airlines
26 Jul - 05 Aug Spirit Airlines
25 Jul - 04 Aug Spirit Airlines

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

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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