For instance, if departing from London, UK, the flight path would likely take over France and Spain before entering the airspace over Gibraltar. If coming from Central or Eastern Europe, the route might go over Germany, Switzerland, France, and then Spain. From Scandinavia or Northern Europe, the flight would likely pass over Northern Germany or the Netherlands, Belgium, France, and Spain.
Other routes are possible, but they usually involve flying over one or more European countries before reaching Spain and Gibraltar. The exact flight path and countries overflown depend on the specific departure location and the airline's preferred route.