Cheapest return flights from Ontario to San Juan in January from 325€

AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in January 2026 (see full year).

Return flights

31 Jan - 04 Feb Frontier Airlines
30 Jan - 06 Feb Southwest Airlines
28 Jan - 03 Feb Southwest Airlines
29 Jan - 02 Feb Frontier Airlines
26 Jan - 30 Jan Southwest Airlines
30 Jan - 03 Feb Southwest Airlines
29 Jan - 03 Feb Southwest Airlines
22 Jan - 29 Jan Frontier Airlines
28 Jan - 02 Feb Frontier Airlines
25 Jan - 30 Jan Southwest Airlines
29 Jan - 04 Feb Southwest Airlines
26 Jan - 31 Jan Southwest Airlines
27 Jan - 31 Jan Southwest Airlines
28 Jan - 31 Jan Southwest Airlines
21 Jan - 27 Jan Southwest Airlines
21 Jan - 28 Jan Southwest Airlines
24 Jan - 27 Jan Southwest Airlines
23 Jan - 29 Jan Southwest Airlines
27 Jan - 01 Feb Southwest Airlines
28 Jan - 01 Feb Southwest Airlines

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

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