Go through your results for flights to Ontario (USA) in the USA with Netflights. The most popular airlines for this route are KLM, Virgin Atlantic & British Airways, with KLM claiming the top spot. Although JetBlue usually has the best prices, it's best to double check what's available for your travel dates.
Flexible on dates? Conducting your search by month allows you to compare prices to Ontario (USA) throughout the year. For example, prices will almost certainly be higher around October, as this is peak season in Ontario (USA). Accommodation prices will also be higher at this time of year. Flights to Ontario (USA) are usually cheapest in November.
201 direct and indirect flights go to Ontario (USA) every week and we scan them all. Today alone, we've compared 429 flights worldwide, so you're bound to find one that works for you. Look out for flights with JetBlue, as they often have good deals. Or broaden your search by looking at other airports in the USA.
For even more options, check what other airports you could fly to Ontario (USA) from. You might be able to make a saving by going from a different airport or city.