WestJet Airlines Ltd. is a Canadian airline that began as a low-cost alternative to the country's competing major airlines. WestJet provides scheduled and charter air service to 100 destinations in Canada, the United States, Europe, Mexico, Central America and the Caribbean. Founded in 1996, it is currently the second-largest Canadian air carrier, behind Air Canada, operating an average of 425 flights and carrying over 45,000 passengers per day. In 2013, WestJet carried 18.5 million passengers, making it the ninth-largest airline in North America by passengers carried. WestJet is a public company with more than 10,000 employees, is non-unionized and is not part of any airline alliance. It operates three variants of the Boeing 737 Next Generation family, as well as Boeing 767 aircraft, on select long-haul routes. Its subsidiary WestJet Encore also operates the Bombardier Q400. The airline's headquarters is located adjacent to the Calgary International Airport.

In 2015, WestJet had passenger revenues of CAN$4.029 billion and its earnings per share increased 19% to C$2.92.

Founded by Clive Beddoe, David Neeleman, Mark Hill, Tim Morgan and Donald Bell, WestJet was based on the low-cost carrier business model pioneered by Southwest Airlines and Morris Air in the United States. Its original routes were all located in Western Canada, which gave the airline its name.

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