Moving from terminal to terminalMoving between MSP's terminals is free on the light rail transit (LRT) service. Trains run between terminals around the clock, seven days a week, approximately every 15 minutes.
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As stated by the other posters - people connect domestic/domestic at MSP with 40-60 minutes all the time, each and every day - and have zero issues. You can physically get from gate to gate in 5 minutes or less in most cases.
If you're flying Delta, I would say that anything under 45 minutes is too short of a layover in Minneapolis. Yes, there's still a good chance that you'll make it, but the terminal that Delta operates out of at MSP (Terminal 1 – the Lindbergh Terminal) is massive.
The problem with a 30 minute connection at MSP (or anywhere) is that gate agents for most airlines, will begin closing out flights 15 minutes before departure. So, you really have 15 minutes and your margin for error is razor thin, especially if you land a few minutes late or it takes extra time to deboard the plane.
STL Airport provides a free Terminal Shuttle which runs 24 hours a day between Exit 12 at both terminals. There is no route to walk between terminals at this time. Shuttle ride time is approximately 10 minutes, as Terminal 1 and Terminal 2 are just over one mile apart.
Is my layover too short? Allowing yourself at least a 60-minute layover for domestic flights and a two-hour layover time for international flights can often be a much more comfortable and stress-free journey than booking a flight with a very tight connection.
If your itinerary was purchased as one ticket (as in: you have only one itinerary and one confirmation number), and the connection time was too short and you miss the second (or third) flight, you can rest easy, no matter what happens. The airline will simply put you onto the next available flight, free of charge.
Minimum connection times typically range between 30 minutes and two hours for domestic flights within the continental United States. For international flights, the range increases to between one and three hours.
Generally speaking, most airlines will make some kind of efforts to wait for delayed passengers on a connecting flight, though this is not necessarily guaranteed. In some cases, airlines may be able to hold a connecting flight for a period of time, but it is not something that is typically guaranteed by any airline.