Driving
Oldcastle to Sarnia
Updated: 27 May 2026
The drive from Oldcastle to Sarnia is approximately 110 kilometers. You will take Highway 401 East to Highway 402 West. This journey typically takes 1 hour and 15 minutes. Sarnia is located at the mouth of the St. Clair River and is a major border crossing point. It is a quick and easy drive through Southwestern Ontario.
Total Distance: 110 km driving distance; 95 km straight-line air distance.
Fastest Way
Driving via the 401 and 402 is the fastest route.
Cheapest Way
Driving is the most efficient and cost-effective way.
Compare Oldcastle to Sarnia Routes
Driving
Direct
Duration
1 hour 15 mins
Avg Price
$25 - $35 in fuel
Operator
Personal Vehicle
Route
Highway 401 East to Highway 402 West.
The 402 is generally very quiet compared to the 401.
Travel Tips
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Border TrafficCheck wait times for the Blue Water Bridge if you plan to cross.
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ParkingDowntown Sarnia has ample parking.
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Local TransitSarnia Transit operates throughout the city.
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WeatherBe prepared for lake-effect snow in winter.
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NavigationThe 402 is very straightforward.
Safety Tips
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SpeedingWatch for speed traps on the 402.
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WildlifeBe cautious of deer on rural roads.
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EmergencyKeep a basic emergency kit in your car.
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FatigueThe drive is short, but stay alert.
People Also Ask
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How long is the drive?About 1 hour and 15 minutes.
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Is there a train?No direct train service.
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What is the best route?Highway 401 to 402.
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Are there tolls?No, the route is toll-free.
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Is Sarnia a good place to visit?Yes, it has a beautiful waterfront.
Quick Info
- From Oldcastle, Ontario, Canada
- To Sarnia, Ontario, Canada
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Modes
Best Time to Travel
June to August for waterfront activities.
Things to Do in Sarnia
1
Canatara Park
Enjoy the beach and the large park area.
2
Blue Water Bridge
View the bridge connecting Canada and the USA.
3
St. Clair River
Walk along the riverfront trail.
4
Sarnia Bay Marina
Watch the boats and enjoy the waterfront atmosphere.
Tags
Oldcastle to Sarnia
driving to Sarnia
Highway 402 route
Sarnia travel
Ontario road trip
Blue Water Bridge
Oldcastle to Sarnia commute
driving directions
