Cheapest return flights from Ontario to San Juan in December from 398€

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

Return flights

13 Dec - 19 Dec Southwest Airlines
14 Dec - 21 Dec Southwest Airlines
14 Dec - 20 Dec Southwest Airlines
08 Dec - 13 Dec Southwest Airlines
10 Dec - 17 Dec Southwest Airlines
10 Dec - 16 Dec Southwest Airlines
19 Dec - 23 Dec Frontier Airlines
13 Dec - 18 Dec Southwest Airlines
07 Dec - 21 Dec Southwest Airlines
07 Dec - 14 Dec Southwest Airlines
29 Dec - 10 Jan Southwest Airlines
28 Dec - 11 Jan Southwest Airlines
10 Dec - 01 Jan Southwest Airlines
27 Dec - 01 Jan Southwest Airlines
25 Dec - 11 Jan Southwest Airlines
27 Dec - 02 Jan Southwest Airlines
22 Dec - 10 Jan Southwest Airlines
25 Dec - 01 Jan Southwest Airlines
29 Dec - 03 Jan Southwest Airlines
30 Dec - 04 Jan Southwest Airlines

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

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