There are
1,092 mi
from St Peters, MO to Middletown, CT
That's the driving distance. It would take 20 hours 39 mins to go from St Peters, Missouri to Middletown, Connecticut.
The flight distance (direct flight from St Peters, MO to Middletown, CT) is 965.37 mi.
1,092 mi = 1,757.37 kms