Illinois → Missouri · Interstate 90 / Interstate 94
Before turning the key for St. Louis, Missouri, out of Chicago, Illinois, run through the pre-trip checklist: registration card in the glovebox, current insurance card on your phone, working SunPass or E-ZPass transponder for the electronic toll plazas along Interstate 90 / Interstate 94, and a printed backup of the destination address in case GPS reception drops. The locked itinerary measures 498 km (309 miles) with an optimistic estimate of 4h 45m if cruise control sits steadily within the posted limit. Pulling out of Chicago, the largest Midwest metropolis and a national logistics hub, the road eventually delivers you to St. Louis, the historic Gateway to the West and a major Mississippi River freight port. Schedule departure outside the morning rush window and pack a thermos of coffee to skip an unscheduled stop in the first hundred miles. Budget around $41.68 just for the pump (45.3 liters / 12.0 gallons of regular unleaded) plus headroom for tolls. Outbound reimbursement at $0.43/km equals $214.14 cleared to the driver. Use the Clara generator the moment you park to wrap everything into a single digitally signed PDF.