Air Canada often offers multiple nonstop flights between Chicago O'Hare International Airport (ORD) and Toronto Pearson International Airport (YYZ) with full network connectivity across Canada, lounge access options, and Aeroplan benefits. United Airlines also runs frequent nonstop service, providing convenient connections for United's domestic and international network and MileagePlus perks. WestJet may provide connecting options and promotional fares. Compare fare classes, carry-on and checked baggage rules, onboard refreshment offerings, and loyalty program redemption rates when selecting the best carrier for your November trip. CTA: Compare airlines now to find the best balance of price, schedule, and benefits for ORD to YYZ flights.