Cheapest return flights from Ontario to San Juan in December from $501

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

Return flights

03 Dec - 10 Dec Southwest Airlines
01 Dec - 04 Dec Southwest Airlines
07 Dec - 21 Dec Southwest Airlines
14 Dec - 21 Dec Southwest Airlines
13 Dec - 20 Dec Southwest Airlines
14 Dec - 28 Dec Southwest Airlines
29 Dec - 07 Jan Southwest Airlines
30 Dec - 07 Jan Southwest Airlines
24 Dec - 28 Dec Southwest Airlines
28 Dec - 11 Jan Southwest Airlines
21 Dec - 28 Dec Southwest Airlines
26 Dec - 30 Dec Southwest Airlines
21 Dec - 04 Jan Southwest Airlines
28 Dec - 04 Jan Southwest Airlines

Also check the deals for one-way 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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