Sarnia to Williamsport: Road Trip Guide & Distance

How far is Sarnia from Williamsport?

The distance from Sarnia to Williamsport is 301.7 miles (485.6 km) as the crow flies. Williamsport is located ESE of Sarnia. By car, the driving distance is approximately 377.2 miles, taking about 7h 35min. A direct flight would take roughly 1h 6min. Sarnia is in Ontario, Canada, while Williamsport is in Pennsylvania, United States.

This is a solid day of driving. Be sure to take breaks every 2-3 hours to avoid driver fatigue, and plan your meals ahead of time. Heading East means you'll be driving into the sunrise if you start early. Keep your windshield clean for the best visibility. 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 Sarnia and Williamsport. 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.