Cheapest one-way flights from St. Louis to San Juan in July from $115

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

One-Way flights

24 Jul Spirit Airlines
21 Jul Spirit Airlines
04 Jul Frontier Airlines
05 Jul Frontier Airlines
18 Jul Frontier Airlines
06 Jul Frontier Airlines
20 Jul Spirit Airlines
17 Jul Spirit Airlines
29 Jul Frontier Airlines
31 Jul Spirit Airlines

Also check the deals for return 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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