Cheapest one-way flights from Ontario to San Juan in December from $154

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

One-Way flights

30 Dec Frontier Airlines
25 Dec Frontier Airlines
24 Dec Frontier Airlines
23 Dec Frontier Airlines
31 Dec Frontier Airlines
19 Dec Frontier Airlines
20 Dec Frontier Airlines
21 Dec Frontier Airlines
29 Dec Southwest Airlines
27 Dec Southwest Airlines

Also check the deals for return flights from Ontario 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.