AirHint found the following cheapest one-way flights from St. Thomas (STT) to San Juan (SJU) in July 2025 (see full year).
One-Way flights
| 21 Jul | Frontier Airlines | direct | |
| 25 Jul | Frontier Airlines | direct | |
| 28 Jul | Frontier Airlines | direct | |
| 23 Jul | Cape Air | direct | |
| 27 Jul | jetBlue | direct | |
| 31 Jul | Spirit Airlines |
Also check the deals for return flights from St. Thomas to San Juan in July.
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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