Cheapest return flights from Ontario to San Juan in November from $387

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

Return flights

05 Nov - 19 Nov Frontier Airlines
15 Nov - 04 Dec Southwest Airlines
14 Nov - 16 Nov Frontier Airlines
28 Nov - 06 Dec Frontier Airlines
17 Nov - 25 Nov Southwest Airlines
30 Nov - 14 Dec Southwest Airlines
08 Nov - 18 Nov Southwest Airlines
19 Nov - 26 Nov Southwest Airlines
19 Nov - 25 Nov Southwest Airlines
21 Nov - 28 Nov Frontier Airlines
07 Nov - 09 Nov Southwest Airlines
01 Nov - 06 Nov Southwest Airlines
25 Nov - 03 Dec Southwest Airlines
28 Nov - 03 Dec Southwest Airlines
02 Nov - 16 Nov Southwest Airlines

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

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