Distance between cities › Canada › Ontario › Sarnia, ON › Distance from Sarnia to Cornwall Book Hotels

Distance from Sarnia, ON to Cornwall, ON

Distance

712 km

Time

8 hours 36 mins

Gas Cost

$54 - $129

There are 654.52 km (406.70 miles) from Sarnia to Cornwall in northeast direction and 711.33 km (442 miles) by car, following the 401 route.

Sarnia and Cornwall are 8 hours 36 mins far apart, if you drive non-stop .

This is the fastest route from Sarnia, ON to Cornwall, ON. The halfway point is Newcastle, ON.

Sarnia, ON and Cornwall, ON are in the same time zone (EDT). Current time in both locations is 11:24 pm.

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Lowest Price Rental Cars in Sarnia, ON

Planning on renting a car to go from Sarnia, ON to Cornwall, ON? Here there are some offers to rent a car in Sarnia, ON

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Sarnia »

Gas Consumption and Emissions

A car with a fuel efficiency of 8.9 l/100 km will need 63.36 liters of gas to cover the route between Sarnia, ON and Cornwall, ON.

The estimated cost of gas to go from Sarnia to Cornwall is $95.67.

During the route, an average car will release 1,515.52 kilograms of CO₂ to the atmosphere. The carbon footprint would be 2.13 kilograms of CO₂ per kilometer.

Average Canada gas price used for calculation is $1.51 per liter of regular gas. Price last updated on March 4, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Sarnia, ON and Cornwall, ON

If you want to meet halfway between Sarnia, ON and Cornwall, ON or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.924397 and -78.573997, or 43º 55' 27.8292" N, 78º 34' 26.3892" W. This location is 221.17 miles away from Sarnia, ON and Cornwall, ON and it would take approximately 4 hours 18 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Newcastle, ON, situated 223 miles from Sarnia, ON and 221 miles from Cornwall, ON. It would take 3 hours 40 mins to go from Sarnia to Newcastle and 3 hours 40 mins to go from Cornwall to Newcastle.

Major City Closest to Halfway Point

The major city closest to the halfway point between Sarnia, ON and Cornwall, ON is Oshawa, ON, situated 210 miles from Sarnia, ON and 235 miles from Cornwall, ON. It would take 3 hours 28 mins to go from Sarnia to and 3 hours 55 mins to go from Cornwall to Oshawa.

Distance conversions

Checkout the distance in miles, kilometers and nautical miles between Sarnia, ON and Cornwall, ON in this table:

Distance type	Miles	Kilometers	Nautical miles
Straight line distance	406.70 mi	654.52 km	353.41 nautical mi
Driving distance	442 mi	711.88 km	384.39 nautical mi

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