Cheapest one-way flights from Ontario to San Juan in July from $142

AirHint found the following cheapest one-way flights from Ontario (ONT) to San Juan (SJU) in July 2025 (see full year).

One-Way flights

04 Jul Frontier Airlines
03 Jul Frontier Airlines
18 Jul Frontier Airlines
23 Jul Frontier Airlines
09 Jul Frontier Airlines
24 Jul Frontier Airlines
30 Jul Southwest Airlines
26 Jul Southwest Airlines
17 Jul Southwest Airlines
31 Jul Frontier Airlines

Also check the deals for return flights from Ontario to San Juan in July.

Skyscanner

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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