Cheapest return flights from Ontario to San Juan in April from $273

Best time to book flights for Ontario (ONT) to San Juan (SJU) flights at AirHint

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

Return flights

15 Apr - 30 Apr Frontier Airlines
09 Apr - 23 Apr Frontier Airlines
14 Apr - 20 Apr Frontier Airlines
13 Apr - 20 Apr Frontier Airlines
18 Apr - 23 Apr Frontier Airlines
17 Apr - 20 Apr Frontier Airlines
20 Apr - 26 Apr Frontier Airlines
06 Apr - 09 Apr Frontier Airlines
04 Apr - 11 Apr Frontier Airlines
14 Apr - 28 Apr Frontier Airlines
15 Apr - 15 May Southwest Airlines
30 Apr - 02 May Southwest Airlines
26 Apr - 03 May Southwest Airlines

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

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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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