AirHint found the following cheapest return flights from Toronto (YYZ) to San Juan (SJU) in September 2025 (see full year).

Return flights

09 Sep - 13 Sep	United
16 Sep - 20 Sep	United
17 Sep - 23 Sep	United
17 Sep - 24 Sep	United
22 Sep - 26 Sep	United
20 Sep - 30 Sep	United
02 Sep - 25 Sep	United
12 Sep - 21 Sep	Porter Airlines (Canada) Ltd
11 Sep - 18 Sep	WestJet
19 Sep - 26 Sep	United

Also check the deals for one-way flights from Toronto to San Juan in September.

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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Cheapest return flights from Toronto to San Juan in September from 237€

Return flights