
St. Louis Lambert International Airport (STL) serves as a major hub for travelers in the Midwest, offering a wide range of domestic and international flight options. As one of the busiest airports in the region, it is serviced by numerous airlines, including major carriers like Southwest Airlines, Delta Air Lines, American Airlines, and United Airlines, each providing extensive connectivity to various destinations across the United States. Additionally, regional airlines such as Cape Air and Air Choice One cater to smaller markets, while international carriers like Air Canada and Frontier Airlines expand the airport’s reach beyond U.S. borders. Whether you’re planning a domestic trip or an international adventure, understanding which airlines operate out of St. Louis Lambert International Airport can help you make informed travel decisions.
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What You'll Learn

Major Domestic Carriers
St. Louis Lambert International Airport (STL) serves as a key hub for several major domestic carriers, providing travelers with a wide range of flight options across the United States. Among the most prominent airlines operating out of STL is Southwest Airlines, known for its extensive domestic network and customer-friendly policies. Southwest offers numerous daily flights to popular destinations such as Chicago, Denver, Orlando, and Las Vegas, making it a top choice for both leisure and business travelers. The airline’s no-fee policy for checked bags and flexible ticketing options further enhance its appeal.
Another major domestic carrier at STL is American Airlines, which operates a significant number of flights from St. Louis to its hubs in Dallas/Fort Worth, Charlotte, and Miami. American Airlines provides connections to hundreds of destinations nationwide, ensuring travelers can reach nearly any U.S. city with ease. The airline’s frequent flyer program, AAdvantage, is also a draw for loyal customers looking to accumulate miles for future travel.
Delta Air Lines is another key player at St. Louis Lambert International Airport, offering flights to its major hubs in Atlanta, Detroit, and Minneapolis. Delta’s focus on reliability and customer service, combined with its extensive domestic route network, makes it a preferred choice for many travelers. The airline’s SkyMiles program is particularly popular, offering rewards and perks for frequent flyers.
United Airlines also maintains a strong presence at STL, with flights to its hubs in Chicago, Denver, and Houston. United’s comprehensive domestic network ensures that travelers can connect to virtually any destination in the U.S. The airline’s MileagePlus program is another incentive, providing members with opportunities to earn and redeem miles for flights, upgrades, and other benefits.
Lastly, Frontier Airlines has expanded its presence at St. Louis Lambert International Airport, offering affordable domestic flights to destinations such as Denver, Orlando, and Tampa. Frontier’s focus on low-cost travel makes it an attractive option for budget-conscious passengers. While it operates fewer flights compared to the larger carriers, its growing network provides additional flexibility for travelers.
These major domestic carriers collectively ensure that St. Louis Lambert International Airport remains a well-connected gateway for travelers, offering a variety of options to suit different needs and preferences. Whether flying for business or leisure, passengers can rely on these airlines for convenient and efficient domestic travel.
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International Flight Options
St. Louis Lambert International Airport (STL) serves as a gateway to the world, offering a variety of international flight options for travelers. While it may not be as large as some major international hubs, STL provides convenient connections to global destinations through several key airlines. For those seeking international travel, understanding the available carriers and their routes is essential for planning a seamless journey.
One of the primary airlines offering international flights from St. Louis is Air Canada. This carrier operates direct flights to Toronto (YYZ), providing travelers with a convenient connection to Canada. From Toronto, passengers can easily connect to numerous international destinations across Europe, Asia, and beyond. Air Canada’s service from STL is particularly useful for those looking to travel to Canadian cities or use Toronto as a hub for further international travel.
Another significant player in international travel from St. Louis is Delta Air Lines. While Delta primarily focuses on domestic routes from STL, it offers connecting flights to its major hubs like Atlanta (ATL), Detroit (DTW), and Minneapolis (MSP). From these hubs, travelers can access Delta’s extensive international network, including destinations in Europe, Latin America, Asia, and Africa. Delta’s SkyTeam alliance membership also allows passengers to connect seamlessly with partner airlines for additional global options.
American Airlines is another major carrier facilitating international travel from St. Louis. Through its hub in Chicago O’Hare (ORD) and Dallas/Fort Worth (DFW), American Airlines connects STL passengers to a wide range of international destinations. Whether you’re heading to Europe, South America, or Asia, American’s network and its Oneworld alliance partnerships provide ample options for global travel. Additionally, American offers seasonal non-stop flights to popular international destinations, enhancing convenience for STL travelers.
For those seeking travel to Mexico or the Caribbean, Southwest Airlines provides international flight options via connecting routes. While Southwest does not operate direct international flights from STL, its extensive domestic network allows passengers to connect through hubs like Houston (HOU) or Chicago Midway (MDW) to reach destinations like Cancun, Montego Bay, and Punta Cana. Southwest’s no-fee policy for checked bags also makes it an attractive option for international travelers.
Lastly, United Airlines plays a crucial role in connecting St. Louis travelers to international destinations. Through its hubs in Chicago O’Hare (ORD) and Houston (IAH), United offers access to a vast global network. Passengers can fly to Europe, Asia, and South America with ease, leveraging United’s Star Alliance partnerships for additional connectivity. United’s Polaris business class and Economy Plus options also provide comfort for long-haul international flights.
In summary, while St. Louis Lambert International Airport may not offer a plethora of direct international flights, its partnerships with major airlines like Air Canada, Delta, American, Southwest, and United ensure that travelers have ample options for reaching global destinations. By leveraging connecting flights and airline alliances, STL passengers can explore the world with relative ease and convenience.
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Regional Airlines Serving STL
St. Louis Lambert International Airport (STL) is a significant hub for both domestic and international travel, but it also serves as a key point for regional airlines connecting St. Louis to nearby cities and towns. Regional airlines play a crucial role in providing convenient and frequent flights to smaller destinations that may not be served by major carriers. These airlines often operate smaller aircraft, making them ideal for shorter routes while ensuring accessibility and connectivity for travelers.
One of the prominent regional airlines serving STL is Cape Air. Known for its extensive network in the Midwest, Cape Air connects St. Louis to destinations like Marion, Illinois, and other regional points. Their fleet of Cessna 402s and Tecnam P2012 Travellers is well-suited for short-haul flights, offering passengers a quick and efficient travel experience. Cape Air’s focus on reliability and customer service makes it a popular choice for regional travelers.
Another key player is Contour Airlines, which operates out of STL to serve routes like Nashville, Tennessee, and other nearby cities. Contour Airlines uses Embraer ERJ-135 regional jets, providing a comfortable and efficient travel option for passengers. Their schedule is designed to cater to both business and leisure travelers, with multiple daily flights to select destinations. Contour’s commitment to regional connectivity ensures that St. Louis remains well-linked to its neighboring states.
Air Choice One is another regional airline that serves STL, focusing on connecting St. Louis to smaller airports in Missouri, Illinois, and Arkansas. With a fleet of Cessna 208 Caravans, Air Choice One specializes in providing essential air service to communities that might otherwise lack reliable air travel options. Their routes from STL include destinations like Burlington, Iowa, and Fort Dodge, Iowa, making them a vital link for regional travelers.
Lastly, United Express, operated by regional partners like SkyWest Airlines and GoJet Airlines, offers a robust network of flights from STL to cities like Chicago, Denver, and other Midwest hubs. While United Express is part of a larger airline group, its regional services are tailored to meet the needs of shorter routes, ensuring frequent and convenient connections for passengers. Their use of regional jets like the CRJ-200 and CRJ-700 provides a balance of comfort and efficiency for travelers.
In summary, regional airlines serving STL play a critical role in connecting St. Louis to smaller cities and towns across the Midwest. Airlines like Cape Air, Contour Airlines, Air Choice One, and United Express ensure that travelers have access to reliable, frequent, and efficient flight options, enhancing the overall connectivity of the region. Whether for business or leisure, these regional carriers provide essential services that complement the offerings of larger airlines at St. Louis Lambert International Airport.
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Low-Cost Carriers Available
When considering low-cost carriers available at St. Louis Lambert International Airport (STL), travelers have several options that balance affordability with convenience. One of the most prominent low-cost airlines operating out of STL is Southwest Airlines. Known for its no-fee policy on checked bags and flexible ticketing, Southwest offers numerous domestic destinations from St. Louis, including popular routes to Chicago, Orlando, and Denver. The airline’s point-based rewards program, Rapid Rewards, is also a significant draw for frequent flyers looking to maximize savings.
Another key player in the low-cost carrier space at STL is Frontier Airlines. Frontier is renowned for its ultra-low base fares, though additional fees may apply for services like seat selection and carry-on baggage. From St. Louis, Frontier provides flights to destinations such as Las Vegas, Orlando, and Cancun, making it an attractive option for leisure travelers on a budget. The airline’s Discount Den membership program offers further discounts on fares for subscribers.
Spirit Airlines is also a notable low-cost carrier available at St. Louis Lambert International Airport. Spirit operates on a similar model to Frontier, offering bare-bones fares with additional charges for extras. Despite this, the airline’s extensive route network includes destinations like Fort Lauderdale, Los Angeles, and Tampa, providing budget-conscious travelers with access to both coastal and inland cities. Spirit’s $9 Fare Club is another way for frequent flyers to save on ticket costs.
For travelers seeking international low-cost options, Sun Country Airlines occasionally operates seasonal or charter flights from STL. While not as frequent as domestic carriers, Sun Country offers affordable flights to destinations like Mexico and the Caribbean, often with bundled vacation packages. This makes it an ideal choice for St. Louis residents planning budget-friendly getaways.
Lastly, while not exclusively a low-cost carrier, Allegiant Air provides select routes from St. Louis with a focus on affordability. Allegiant specializes in connecting smaller cities to leisure destinations, such as Punta Gorda and Sarasota in Florida. The airline’s business model emphasizes low base fares, though additional fees for baggage and seat selection apply. Allegiant’s seasonal schedules from STL cater primarily to vacationers looking for cost-effective travel options.
In summary, St. Louis Lambert International Airport offers a variety of low-cost carrier options, including Southwest, Frontier, Spirit, Sun Country, and Allegiant Air. Each airline has its own unique pricing model and destination network, providing travelers with flexibility and affordability when planning their trips. By understanding the offerings of these carriers, passengers can make informed decisions to suit their budget and travel needs.
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Frequent Destinations from STL
St. Louis Lambert International Airport (STL) serves as a key hub for travelers in the Midwest, offering a variety of domestic and international flights. When considering Frequent Destinations from STL, several routes stand out due to their popularity and the number of airlines servicing them. Major carriers like Southwest Airlines, American Airlines, Delta Air Lines, and United Airlines dominate the schedule, providing frequent flights to high-demand cities. These airlines ensure that travelers from St. Louis have convenient access to both business and leisure destinations across the United States.
One of the most frequent destinations from STL is Chicago (ORD/MDW), a major transit hub and a popular destination for both business and leisure travelers. American Airlines and Southwest Airlines offer multiple daily flights to Chicago, making it easy for St. Louis residents to connect to international or cross-country flights. Similarly, Atlanta (ATL) is another highly trafficked route, primarily serviced by Delta Air Lines, which operates numerous daily flights to its main hub, connecting STL passengers to destinations worldwide.
For travelers heading west, Denver (DEN) is a frequent destination from STL, with both Southwest and United Airlines offering regular flights. Denver serves as a gateway to the Rocky Mountains and is a popular choice for outdoor enthusiasts and business travelers alike. Another prominent route is Dallas/Fort Worth (DFW), serviced by American Airlines and Southwest, which provides easy access to Texas and beyond, including connections to Latin America.
Florida is a favorite destination for St. Louis travelers, particularly during the winter months. Frequent flights to Orlando (MCO), Tampa (TPA), and Fort Lauderdale (FLL) are available via Southwest Airlines, making it convenient for families and vacationers to escape to warmer climates. These routes are especially popular during holiday seasons and school breaks.
Lastly, for those seeking international travel, Cancun (CUN) and Toronto (YYZ) are frequent international destinations from STL. Seasonal flights to Cancun, often operated by Southwest or vacation-focused airlines, cater to travelers seeking sun and sand. Meanwhile, flights to Toronto, typically serviced by Air Canada or partner airlines, provide a direct link to Canada for business or leisure purposes. These international options, though less frequent than domestic routes, highlight STL's growing connectivity to global destinations.
In summary, Frequent Destinations from STL include major U.S. hubs like Chicago, Atlanta, Denver, and Dallas, as well as popular leisure spots in Florida and international destinations like Cancun and Toronto. The variety of airlines operating out of St. Louis ensures that travelers have ample options for both domestic and international travel, making STL a convenient departure point for a wide range of journeys.
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Frequently asked questions
Major airlines operating out of St. Louis Lambert International Airport include Southwest Airlines, American Airlines, Delta Air Lines, United Airlines, and Air Canada.
Yes, St. Louis Lambert International Airport offers international flights, primarily through Air Canada to Toronto and seasonal flights to Cancun and other destinations via various carriers.
Yes, Southwest Airlines is one of the largest carriers at St. Louis Lambert International Airport, offering numerous domestic flights to destinations across the United States.
Yes, low-cost carriers such as Southwest Airlines, Frontier Airlines, and Allegiant Air operate out of St. Louis Lambert International Airport, providing budget-friendly travel options.
Regional airlines operating out of St. Louis Airport include Envoy Air (operating as American Eagle), SkyWest Airlines (operating as Delta Connection and United Express), and CommuteAir (operating as United Express).







































