Which term is used to describe a flight that originates and returns to the same location on the same day?

The term that describes a flight originating and returning to the same location on the same day is "Turnaround." This terminology is especially relevant in the context of airport operations and airline scheduling, where a flight taking off from a particular airport and returning to it without any overnight stop is referred to as a turnaround flight.

Turnaround flights are commonly found in regional and commuter airline services where schedules are designed to maximize aircraft usage and accommodate travelers who need to return home quickly within the same day.

In contrast, options like a round trip flight generally imply a journey that may involve a longer duration and possibly different legs, typically including overnight stays at either the departure or arrival location. Local flights usually refer to shorter flights within a particular geographic area or region but do not specifically imply a return on the same day. Direct flights convey the idea of traveling from one destination to another without layovers, which does not emphasize the return to the original location on the same day.