Choosing the "best" airline depends on whether you prioritize luxury or reliability, but Air Canada and Delta Air Lines are widely considered the top choices for transborder travel in 2026. Air Canada offers the most extensive network, connecting nearly every major U.S. city to its hubs in Toronto, Montreal, and Vancouver, and is often praised for its "Signature Class" (lie-flat seats) on longer routes. However, Delta is frequently ranked highest for operational reliability and "on-time" performance among U.S. carriers flying north. For budget-conscious travelers, Porter Airlines has become a major "disruptor" in the market, offering a more premium economy experience with free Wi-Fi, no middle seats on many planes, and complimentary beer and wine in glassware. While WestJet is a strong contender for travel into Western Canada (Calgary/Edmonton), Air Canada remains the "Best Airline in North America" according to recent Skytrax rankings, making it the standard-bearer for the US-Canada corridor.