Amtrak has a route, but it is not a direct or fast option.

How long is the drive?

Expect 14 to 15 hours of driving time.

Stick to tourist areas like Forest Park and the Arch.

Only in Pennsylvania; the rest of I-70 is mostly toll-free.

Catonsville

St. Louis

Flight Driving

Catonsville to St. Louis

Updated: 31 May 2026

The journey from Catonsville to St. Louis is a long-haul drive of approximately 1,500 kilometers. You will follow I-70 West for nearly the entire duration, crossing through Maryland, Pennsylvania, Ohio, Indiana, and Illinois. This drive typically requires 14 to 15 hours of road time. Flying from BWI to St. Louis Lambert International Airport (STL) is the most practical alternative.

Total Distance: 1,500 km driving, 1,300 km air distance.

Fastest Way

Flying is the fastest, taking 5 hours including airport time.

Cheapest Way

Driving is cheaper for groups, but flying saves significant time.

Compare Catonsville to St. Louis Routes

	Flight Connecting	Driving Direct
Duration	5 hours total	14 hours 30 mins
Avg Price	$350-$600	$180-$250 in fuel
Operator	Southwest Airlines	Personal Vehicle
Route	BWI to STL.	I-70 West all the way to St. Louis.
Tip	Southwest offers frequent connections from BWI.	Plan for an overnight stop in Indianapolis or Columbus.

Travel Tips

Overnight Stops
Book a hotel in Indianapolis to split the drive into two days.
Tolls
The Pennsylvania Turnpike is the only major toll section on this route.
Traffic
Avoid the St. Louis downtown area during the morning rush.
Fuel
Fill up in Missouri, where gas prices are often lower than in the East.
Navigation
Download offline maps as cell service can be spotty in rural Illinois.