Cheapest one-way flights from Ontario to San Juan in December from $283

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

One-Way flights

04 Dec Southwest Airlines
03 Dec Southwest Airlines
02 Dec Southwest Airlines
13 Dec Southwest Airlines
16 Dec Southwest Airlines
28 Dec Southwest Airlines
23 Dec Southwest Airlines
18 Dec Southwest Airlines

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

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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