The drive from Chicago to St Louis takes approximately 4h 30min, covering 300 miles via I-90. Under normal conditions, expect to spend around $35 on gas.
Travel time can vary — during peak hours, weekends, or holidays, the journey may take 6–7+ hours. For the fastest trip, leave early morning (before 7 AM) or travel on weekday evenings.
Traffic Estimate
🟢 Light traffic
3h 50m
🔵 Typical
4h 30min
🔴 Heavy traffic
6h 32m
Traffic is usually worst during weekday rush hours (7–9 AM, 4–7 PM) and holiday weekends.
Trip Details
Distance300 miles (482 km)
Drive Time4h 30min
RouteI-90
Best TimeEarly morning (6-8 AM)
Fuel Costs
Gas (30 mpg)~10.0 gallons
Est. Cost$35
Route Tips: I-90
The longest Interstate, coast to coast. Tolls in several states (Ohio, Indiana, Illinois).
This trip can typically be done on a single tank of gas.
Best Time to Drive from Chicago to St Louis
The best time to drive from Chicago to St Louis is early morning (6-8 am). Weekday mornings before 7 AM or evenings after 7 PM typically have the lightest traffic. Avoid Friday afternoons and Sunday evenings when possible.
🟢 Best:Early morning (6-8 AM)
🔴 Avoid:Rush hour (4-7 PM)
Driving vs Flying
🚗 Driving
4h 30min
~$35 gas
✈️ Flying
3h 6m
~$80–$150 flight
✈️ Flying is faster when you factor in airport time. Flight time is ~36 min but add ~2.5 hours for check-in, security, and boarding.
All Travel Options
🚗 Drive
4h 30min
~$35
🚌 Bus
6h 40m
~$24–$54
🚂 Train
5h 27m
~$36–$90
Estimated times and prices. Bus/train availability varies by route. Driving gives the most flexibility for stops and schedules.
Frequently Asked Questions
How long does it take to drive from Chicago to St Louis?
The drive from Chicago to St Louis takes approximately 4h 30min covering 300 miles via I-90. Actual time may vary based on traffic, weather, and road conditions.
How much does gas cost for Chicago to St Louis?
At 30 MPG and $3.50/gallon, expect to spend approximately $35 on gas for this 300-mile trip. You'll need about 10.0 gallons of fuel.
What is the best time to drive from Chicago to St Louis?
Early morning (6-8 AM) to avoid heavy traffic. Weekday mornings before 7 AM or evenings after 7 PM typically have less congestion.
Are there tolls on the Chicago to St Louis route?
There may be minor tolls (around $9) on parts of this route. Some sections have toll-free alternatives.
