To reach the midway point from Union (Kentucky) to St. Louis, you would fly roughly 149 miles from St. Louis to the halfway stop.
The exact coordinates of the midpoint are:
38° 49' 8" N
87° 26' 43" W
The best place to meet based on recommendations from Trippy members is Vincennes.
Some of the best places to meet are:
Want to plan out your whole trip? Go to the main page to find other halfway points.
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Q&A from St. Louis to Union (Kentucky):