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

Distance from Cornwall, ON to Saint Thomas, ON

Distance

627 km

Time

7 hours 44 mins

Gas Cost

$47 - $114

There are 573.80 km (356.54 miles) from Cornwall to Saint Thomas in southwest direction and 626.03 km (389 miles) by car, following the 401 route.

Cornwall and Saint Thomas are 7 hours 44 mins far apart, if you drive non-stop .

This is the fastest route from Cornwall, ON to Saint Thomas, ON. The halfway point is Grafton, ON.

Cornwall, ON and Saint Thomas, ON are in the same time zone (EDT). Current time in both locations is 1:00 pm.

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Lowest Price Rental Cars in Cornwall, ON

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

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Cornwall »

Gas Consumption and Emissions

A car with a fuel efficiency of 8.9 l/100 km will need 55.77 liters of gas to cover the route between Cornwall, ON and Saint Thomas, ON.

The estimated cost of gas to go from Cornwall to Saint Thomas is $84.21.

During the route, an average car will release 1,333.97 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 Cornwall, ON and Saint Thomas, ON

If you want to meet halfway between Cornwall, ON and Saint Thomas, ON or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.999786 and -78.069885, or 43º 59' 59.2296" N, 78º 4' 11.586" W. This location is 194.68 miles away from Cornwall, ON and Saint Thomas, ON and it would take approximately 3 hours 52 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Grafton, ON, situated 193 miles from Cornwall, ON and 202 miles from Saint Thomas, ON. It would take 3 hours 12 mins to go from Cornwall to Grafton and 3 hours 26 mins to go from Saint Thomas to Grafton.

Distance conversions

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

Distance type	Miles	Kilometers	Nautical miles
Straight line distance	356.54 mi	573.80 km	309.83 nautical mi
Driving distance	389 mi	626.61 km	338.34 nautical mi

Road Trip Tips