It's important to note that the information provided here is subject to change. Frontier Airlines: Offers some of the most competitive fares for domestic flights, with a focus on environmental efficiency and a wide range of options for customization of travel.Spirit Airlines: A leading low-cost carrier that offers affordable flights to various destinations across the U.S., Latin America, and the Caribbean, ideal for budget-conscious travelers.Alaska Airlines: Known for its customer service and extensive network, Alaska Airlines connects passengers to major cities across the United States, Canada, and Mexico.Air Canada: Provides international connections to Canada, offering both business and leisure travelers convenient access to numerous Canadian cities.In addition to Southwest, American Airlines, Delta Air Lines, and United Airlines, Lambert St Louis Airport is serviced by several other key airlines, broadening the horizon for travelers with more destinations and specialized services. United's Polaris business class and Economy Plus seating options cater to a variety of preferences and budgets, ensuring comfort for all passengers. It caters to both domestic and international travelers, offering a seamless travel experience. United Airlines, with nonstop service to over 10 destinations from STL, is known for its global reach and customer care excellence. Delta's commitment to safety and cleanliness, along with its SkyMiles program, ensures a rewarding experience for frequent flyers. It emphasizes reliability and customer service, aiming for a comfortable and hassle-free journey. Delta Air LinesÄelta Air Lines offers nonstop service to more than 10 destinations from the airport. Passengers can enjoy benefits like a wide range of in-flight entertainment options and the opportunity to earn miles through the AAdvantage program. Its extensive global network and dedication to customer satisfaction make it a preferred airline for both domestic and international routes. American AirlinesĪmerican Airlines, another key player at STL, provides nonstop service to over 20 destinations. Southwest also boasts a flexible cancellation policy and two free checked bags, enhancing its appeal to a broad spectrum of travelers. Known for low fares and exceptional customer service, it's a go-to for travelers seeking affordable options. Southwest Airlines, the largest carrier at the airport, offers nonstop service to over 40 destinations. With an average of 250 daily flights and nonstop service to over 70 destinations, it stands as a popular choice for both business and leisure travelers. St Louis Airport is served by several major air carriers, providing travelers with a variety of options for their air travel needs. Whether you choose a peaceful beachfront getaway, a big-city adventure, or something in between, Southwest can take you there from Lambert-St. Your Guide to Airlines Serving Lambert St Louis Airport Louis with a flight on Southwest Airlines.