Cheapest return flights from Ontario to San Juan in October from $596

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

Return flights

23 Oct - 26 Oct Frontier Airlines
28 Oct - 02 Nov Southwest Airlines
31 Oct - 02 Nov Southwest Airlines
31 Oct - 03 Nov Southwest Airlines
24 Oct - 29 Oct Southwest Airlines
25 Oct - 29 Oct Southwest Airlines
27 Oct - 03 Nov Southwest Airlines
26 Oct - 02 Nov Southwest Airlines
26 Oct - 03 Nov Southwest Airlines
26 Oct - 09 Nov Southwest Airlines
23 Oct - 28 Oct Southwest Airlines

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

Powered by

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Feel free to contact us with any feedback or request another flight research.