There are various points from which the distance could be measured. The distance between the furthermost east and west points however, is 3,128 miles.
That would depend on the starting point and the destination, but the most common answer is about 3,000 miles.
310000km from my perspective
45 kilometres across QEW.
237 kilometres across TRANS-CANADA HIGHWAY 1.
Going across the Pacific Ocean the distance is 11,342km. That is 7047.6 miles.
110 kilometres across the QEW.
Depends on where you start and end
This distance across Lake Erie from Cleveland, Ohio to the Canadian shoreline is approximately 54 miles.
100 mile
There are three Bristols in Canada, so that distance would be zero. There are at least twenty Bristols in the United States, each with a unique distance from Canada and one Bristol in the UK which most of the others are named after. Given that Canada is over 4000 miles across, it is difficult to give a specific answer to a question with so many possible interpretations.
The distance from Franklin Island (territory belonging to Greenland) to Ellesmere Island (Canada), across the Nares Strait, is about 25 km. If the Canadian claim to Hans Island is considered valid, Canada is even closer, at a distance of approximately 20 km. From Qaqortoq, Greenland, to Iqaluit, Canada, it is about 740miles, or 1200km. From Qaanaaq to Ellesmere Island (the closest it is to canada), it is about 140miles, or 230km.
The longest distance that travels entirely across the United States is from northwest Washington to southeast Florida and is about 2800 miles, or 4500 kilometers. The distance between northeast Maine and the West Coast is greater, but much of this route passes through Canada.
Across Canada was created in 1999.
The extreme width of Canada is 9,306 km (5,780 miles) The extreme north-south distance is 4,634 km (2873 miles).