Southwest Airlines generally suggests a minimum connection time (MCT) of 30 to 45 minutes for domestic flights, but this can vary depending on the airport. Because Southwest operates a "point-to-point" system rather than a "hub-and-spoke" model, many connections are "on the same concourse," making short transfers possible. However, 30 minutes is considered "tight" and leaves zero room for even minor flight delays or long walks between gates in massive airports like Denver (DEN) or Baltimore/Washington (BWI). If you are traveling with small children, have mobility issues, or are checking bags during a period of high congestion, Southwest's own booking system will usually steer you toward 60-to-90-minute connections. It is important to remember that Southwest begins boarding 30 minutes before departure and closes the jet bridge door 10 minutes prior to take-off; if you have a 35-minute connection and your first flight is 10 minutes late, you are at a very high risk of missing your second flight.