As of November 2023, Southwest Airlines has scheduled flights to over 100 destinations^[1] in 42 states, Puerto Rico, Mexico, Central America and the Caribbean, the newest being Syracuse, New York on November 14, 2021. However, service to the city ended in 2024. The airline has 15 focus cities and operates over 4,000 flights each day.^[2]

Southwest does not use the "hub and spoke" system of other major airlines, preferring instead the "point-to-point" system with focus cities.^[3] It has large operations in certain airports. An average of 80 percent of Southwest passengers are local passengers—only 20 percent are connecting passengers, a lower percentage than on most major airlines, where many passengers connect in hub cities. However, at Southwest's focus cities, the percentage of connecting passengers can reach 30 percent.^[4] As part of its effort to control costs, Southwest historically used secondary airports in cities where the primary airports have high costs, such as Chicago, Dallas/Fort Worth, Houston and Miami. In the early 21st century, however, the airline has been expanding into primary airports as well.^[5]

In most cities where Southwest uses both a primary and secondary airport, the secondary airport is used more than the primary for flights (such as Oakland instead of San Francisco), with some exceptions such as the Los Angeles metro area, where Los Angeles International is a Southwest base and secondary airports (such as Burbank, Long Beach, Santa Ana and Ontario) have limited Southwest operations despite having a higher market share at the smaller airports. Until 2006, Southwest did not fly into Denver,^[6] which is now its most popular destination.

Unlike most other U.S. airlines, Southwest does not fly outside North America, and it does not fly to Canada due to its payment system not being set up for Canadian dollars.^[7]

Southwest began planning international service when it acquired AirTran Airways, which already served international destinations. Southwest's first approach to international service came on April 19, 2012, when it signed a contract with the Amadeus IT Group to launch an international reservation system. This agreement gave the airline the capability to begin flying to destinations outside of the United States.^[8]

Southwest debuted the international reservation system on January 27, 2014, when its first international flights went on sale. This was followed by the first international flights which began on July 1, 2014, to Aruba (AUA), Montego Bay, Jamaica (MBJ) and Nassau, Bahamas (NAS).

Southwest built a 5-gate international terminal at William P. Hobby Airport that opened in 2015. Southwest also built a 5-gate international terminal in Fort Lauderdale that opened in 2017.^[9] In 2021, a 5-gate extension of terminal A at Baltimore/Washington International Airport opened. Southwest is the sole occupant of Terminal A and it invested significantly in the creation of the extension.^[10]

As of January 3, 2024, there are 20 airports at which Southwest Airlines has over 80 daily departures.^[11]

As of September 2024, Southwest Airlines flies to 117 destinations.

Notes:

• Southwest Airlines Route Map