If you don’t want to visit Tijuana in October, then you should wait until November to fly from Canada, when ticket prices are also cheap, with an average price of 645 C$.
The cheapest day to depart on your flight to Tijuana is on a Wednesday when prices can be found for as low as 564 C$. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around 862 C$. These prices are subject to change though, so be sure to set up a Price Alert for flights to Tijuana.