Cheapest one-way flights from St. Louis to San Juan in December from 72€

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

One-Way flights

04 Dec Frontier Airlines
15 Dec Frontier Airlines
13 Dec Frontier Airlines
11 Dec Frontier Airlines
25 Dec Frontier Airlines
18 Dec Spirit Airlines
17 Dec Frontier Airlines
20 Dec Frontier Airlines
13 Dec Southwest Airlines direct
20 Dec Southwest Airlines direct

Also check the deals for return flights from St. Louis to San Juan in December.

Powered by

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Feel free to contact us with any feedback or request another flight research.