Cheapest return flights from Ontario to San Juan in December from $330

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

Return flights

05 Dec - 14 Dec Frontier Airlines
10 Dec - 16 Dec Southwest Airlines
11 Dec - 18 Dec United
08 Dec - 16 Dec Southwest Airlines
07 Dec - 14 Dec Southwest Airlines
07 Dec - 21 Dec Southwest Airlines
11 Dec - 17 Dec Southwest Airlines
01 Dec - 08 Dec Southwest Airlines
03 Dec - 11 Dec Southwest Airlines
01 Dec - 03 Dec Southwest Airlines
25 Dec - 04 Jan Frontier Airlines
29 Dec - 10 Jan Southwest Airlines
21 Dec - 04 Jan Frontier Airlines
30 Dec - 07 Jan Southwest Airlines
28 Dec - 11 Jan Southwest Airlines
28 Dec - 04 Jan Southwest Airlines
21 Dec - 07 Jan Southwest Airlines
21 Dec - 05 Jan Southwest Airlines
26 Dec - 01 Jan Southwest Airlines
24 Dec - 04 Jan Southwest Airlines

Also check the deals for one-way flights from Ontario to San Juan in December.

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