A layover is a short connection at an airport between flights, the kind that happens when a traveler flies from Atlanta to Denver with a stop in Dallas. The time on the ground is spent waiting for the next flight, not seeing the city. A stopover is different by design: it's an intentional break of a day or more in a connecting city, such as spending time in London before continuing on to a final destination of Tokyo.

Whether leaving the airport is possible during a long layover depends on the time available and what's required to get back through security. Travelers who go into the city during a layover need to account for immigration and customs on the way back in, plus a second trip through security. Some major airports sit well outside the city center, which can eat into whatever free time a longer layover provides.

Neither format is better than the other; it depends on what the traveler is trying to do. A layover suits someone who wants to get to their destination with minimal delay. A stopover works for someone who wants to see a second city without booking it as a separate trip.

Airlines don't all define these terms the same way, and that distinction isn't just semantic. How a carrier classifies a connection's length can affect ticket pricing and how the itinerary is structured, so checking the specific airline's rules before booking matters.