KC to St. Louis is about 290 miles (467 km) by road and 238 miles in a straight line. The drive takes around 5 hr 11 min. The distance is the same in reverse, from St. Louis to KC.
What This Distance Means for Your Trip
At 290 miles, this is a driving distance rather than a flying one — and a train or bus is often an option too. A scheduled flight would cover only about 238 miles in the air, and once you factor in getting to the airport, checking in and clearing security, that airport time alone cancels out anything saved aloft. For a trip this length, driving is almost always the practical choice.
Want the full side-by-side on time, cost and hassle? See our drive-or-fly breakdown for KC to St. Louis.
How we calculate these figures
Straight-line distance uses the great-circle (haversine) formula between each city's centre coordinates. Road distance applies a circuity factor of roughly 1.2–1.4× to reflect that roads are not straight. Driving time assumes typical blended speeds for a trip of this length, and flight time is the great-circle distance at about 875 km/h cruise plus around 30 minutes for taxi, climb, descent and approach. The door-to-door air estimate adds about three hours for airport access, check-in, security and boarding. Real figures vary with your exact route, traffic, weather, aircraft and connections.
Kansas City to St. Louis is a 250-mile east-west drive across Missouri on I-70 — the most direct connection between two cities that define Missouri's identity. The drive passes through the rolling Missouri River valley and Columbia, home of the University of Missouri.
This is one of Missouri's BBQ corridors — both Kansas City and St. Louis have their own distinct barbecue styles, and the debate between them is a genuinely serious matter of state pride.
Stops Along the Way
A lively college town with good food, brew pubs, and the University of Missouri campus — the natural halfway stop on I-70.
Meeting someone from St. Louis? Find the exact halfway point between KC and St. Louis so neither of you drives the whole way — or plan evenly-spaced rest and fuel stops along the route.
Tips for This Trip
The BBQ question must be settled
Kansas City BBQ (burnt ends, thick sauce) vs St. Louis BBQ (pork steaks, Maull's sauce) — try both and form your opinion.
I-70 construction zones are frequent
Missouri's I-70 is in an extended renovation program with recurring construction zones. Allow extra time and watch for lane changes.
Columbia deserves a lunch stop
The University of Missouri's college town has excellent food options — better than most comparable towns on Midwestern interstates.
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Frequently Asked Questions
St. Louis is about 220 miles (354 km) from Kansas City in a straight line, and approximately 250 miles (402 km) by road via Interstate 70 east through Columbia, Missouri.