after flying now between a local city pair with ~350km distance inbetween for several years, I made following consideration:
Assuming that you have two airports with the similar runway direction and the direction from one airport to the other is similar to their runway direction:
Until which wind speed and distance between the airports, the flight is more economic with headwind because you don't have to circle or fly traffic patterns on departure and arrival? (no holdings in this case)
So the point is, that the total flying distance is longer with tailwind, because takeoff and landing are in the wrong direction with headwind. How strong has the wind to be, to compensate the total distance flown.... OR how long has the direct distance to be that even a slight tailwind compensates the additional circling/pattern distance?
So I guess one can draw a graph with head-/tailwind speed on one axis and the distance between those two airports on the other axis.
As a result we get a line which shows the breakeven-point.
What do you think about that thought?