Cheapest return flights from Ontario to San Juan in December from $452

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

Return flights

07 Dec - 14 Dec Southwest Airlines
05 Dec - 10 Dec Southwest Airlines
09 Dec - 14 Dec Southwest Airlines
05 Dec - 14 Dec Southwest Airlines
06 Dec - 16 Dec Southwest Airlines
11 Dec - 15 Dec Southwest Airlines
07 Dec - 21 Dec Southwest Airlines
12 Dec - 20 Dec Southwest Airlines
14 Dec - 21 Dec Southwest Airlines
28 Dec - 11 Jan Southwest Airlines
14 Dec - 28 Dec Southwest Airlines
29 Dec - 09 Jan Southwest Airlines
28 Dec - 02 Jan Southwest Airlines
23 Dec - 04 Jan 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.

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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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