Pick the city you would fly from, or let the browser ask for your position. Every hospital and cluster in this directory, sorted by great-circle distance, with an arithmetic estimate of the flying time.
Distance is the great circle: 6,371 km sphere, point to point. The flying time is that distance at 850 km/h plus 45 minutes for the ground and the climb — arithmetic, not a timetable, and it knows nothing about routing, wind or a connection. A position, if the browser gives one, is read by the arithmetic on this page.