Mackinac Island to St. Louis: Epic Midwest Road Trip Guide

The route from Mackinac Island, MI to St. Louis, MO spans about 550 miles—but no direct highway cuts across. You'll take I-75 south to the Ohio Turnpike, then I-70 west through Indianapolis and across Illinois. A fascinating detail: the highway crosses the Mackinac Bridge, the longest suspension bridge in the western hemisphere at 5 miles. The drive typically takes 9–10 hours without stops, but you'll want to linger. This guide covers how to find the best stops and hidden gems between cities.

Key Data Table

The journey begins on Mackinac Island—a car-free zone. You'll take a ferry to Mackinaw City (about 16 minutes). From there, follow I-75 south to Saginaw, then I-69 west to Lansing. Continue I-96 to I-94, then I-69 again to I-70 west. The final leg is I-70 across Illinois to St. Louis.

• Total tolls: about $15 on the Ohio Turnpike (I-80/90)
• Fuel stops: Every 30–40 miles on interstates; recommended at Meijer or Costco near major cities
• EV charging: Many Superchargers along I-70 in Indiana and Illinois

Road quality is generally good, but watch for construction on I-75 in Michigan (summer months). Illinois sections of I-70 have concrete surfaces with rumble strips. The Missouri side near St. Louis is well-maintained asphalt.

• Key highways: I-75 (MI), I-69 (MI-IN), I-70 (IN-IL-MO)
• Alternative scenic route: US-31 along Lake Michigan (adds 2 hours)

Safety is paramount. Michigan's Upper Peninsula can have icy roads as early as October. In summer, construction zones on I-75 near Grayling require reduced speeds. The Ohio Turnpike has limited shoulders—plan for rest areas every 50 miles. Illinois I-70 has wide medians, reducing headlight glare. Always carry water and snacks; cell service is spotty in rural Michigan.

• Family-friendly: Children's Museum of Indianapolis (off I-70 in Indianapolis) – largest in the world
• Pet-friendly: Dog-friendly rest stops include Kensington Metropark (MI, exit 151) and Walnut Creek (IL, exit 95)
• Fatigue management: Stop at Meijer stations (clean bathrooms) every 2–3 hours; consider a nap at the Terre Haute Welcome Center

Hidden off-route spots: If you have time, detour to the Windmill Dutch Village in Holland, MI, or the Cahokia Mounds just east of St. Louis (UNESCO World Heritage site). These are underrated and add cultural depth to the trip.

• Best lunch stop: A&W in Kankakee, IL (exit 308 off I-57) – classic drive-in with root beer floats
• Hidden gem: Buchanan, MI (off I-94) – small town with antique shops and a vintage theater

You'll traverse five distinct landscapes: the Straits of Mackinac, Michigan's farmland, Indiana's industrial corridor, Illinois prairie, and the Mississippi River bluffs. Near Mackinaw City, the Mackinac Bridge offers panoramic views of Lake Michigan and Lake Huron. As you head south, the terrain flattens into corn and soybean fields (best seen in late summer).

• Natural Attractions: Tunnel of Trees (M-119 near Petoskey) – 30-minute detour
• Indiana Dunes National Park (near I-94) – 15 miles of beach along Lake Michigan
• Starved Rock State Park (Illinois, off I-80) – sandstone canyons and waterfalls

Local commerce thrives on small towns: pick up Michigan cherries in Traverse City (slight detour), Indiana popcorn in Remington, and Illinois pumpkins in Tuscola. St. Louis is famous for toasted ravioli and gooey butter cake—try these at local diners near the Arch.

• Amish country near Shipshewana, IN (I-69 exit 204) – handmade furniture and baked goods
• Route 66 in Illinois (historic alignment parallels I-55) – vintage gas stations and diners