Next to nothing
That is right. Here's why:
Amazing Races usually end with a leg featuring a long international flight from Asia, Europe, South America or another flying from or finishing in a distant part of the U.S. (Alaska, Hawaii, Guam). The only ones not fitting that that occur to me are AR5 (Calgary) and AR8 (Toronto).
Editor's right - airlinesguy is basically right in his recommendation below. I did not include any Caribbean jumping-off-for-finale points, but AR7 with Jamaica/Puerto Rico could qualify. The flight from San Juan into Miami was only a few hours, which is why I did not think of it.