Marshfield to Thunder Bay: Road Trip Guide & Distance

How far is Marshfield from Thunder Bay?

The distance from Marshfield to Thunder Bay is 260.2 miles (418.8 km) as the crow flies. Thunder Bay is located N of Marshfield. By car, the driving distance is approximately 325.3 miles, taking about 6h 33min. A direct flight would take roughly 1h 1min. Marshfield is in Wisconsin, United States, while Thunder Bay is in Ontario, Canada.

For a drive of this length, it's recommended to plan at least one quick rest stop to stretch your legs and grab a coffee. Keep in mind this route crosses international borders. Don't forget your passport, and check current border crossing times and vehicle insurance requirements.

Coordinates come from public place data for Marshfield and Thunder Bay. The driving distance is estimated from straight-line distance with a road-factor model, so confirm the route in your navigation app. Fuel, flight, bus, and train values are planning estimates and can change by date, provider, road closures, and border rules.