Longueuil, QC → Ottawa, ON

The journey from Longueuil to Ottawa via Highway 20 and Highway 417 is a straightforward drive that covers approximately 138 miles in just over two hours. You'll begin by heading northwest from Longueuil, crossing the Saint Lawrence River and entering Highway 20, which you'll follow as it curves toward the Ontario border. The highway then transitions into Highway 417, Canada's major east-west corridor through Ontario, which carries you directly into Ottawa. This route is remarkably efficient for a cross-provincial journey, avoiding most congested urban sprawl once you clear the greater Montreal area.

As you travel eastward from the Montreal region, the landscape gradually transitions from the flat lowlands of the Saint Lawrence Valley into gently rolling terrain characteristic of southern Ontario. You'll notice the elevation gradually increase as you approach the Ottawa region, though the changes are subtle and present no significant driving challenges. The entire route stays well below 1,000 feet of elevation, making this a driver-friendly corridor that remains relatively consistent throughout all seasons. The terrain shifts from more developed, suburban stretches near Longueuil to increasingly rural farmland and forest as you progress deeper into Ontario, creating a pleasant sense of moving away from urban congestion.

The drive passes through or near several recognizable communities, with Hawkesbury, Ontario serving as a notable midway point where the landscape becomes distinctly more rural. From there, Highway 417 continues through the green belt regions of eastern Ontario before merging into the greater Ottawa area, where you'll encounter the capital's suburban sprawl before reaching downtown. You'll cross several river systems along the way, including the Outaouais River, which marks the final approach into the National Capital Region.

Spring through early fall represents the ideal season for this drive, when the rural stretches display lush greenery and road conditions are optimal. Winter driving requires extra caution, as snow and ice can affect Highway 417 in the Ontario section, while the Highway 20 corridor near Montreal often experiences significant winter traffic congestion. Autumn offers particularly pleasant conditions with comfortable temperatures and excellent visibility for the entire journey.

The 138-mile drive from Longueuil, Quebec to Ottawa, Ontario takes approximately 2h 18m under normal conditions. Weather along this route can vary significantly, especially across varying terrain where weather conditions can change rapidly. Route Outlook helps you find the safest time to travel by showing you weather conditions at every point along your route, timed to when you'll actually be there.

Common Weather Hazards on This Route

• Winter storms and heavy snowfall (November through April)
• Black ice on mountain passes and bridges

Seasonal Driving Considerations

The Northeast corridor sees the full range of seasonal weather. Nor'easters from November through March can dump heavy snow and create whiteout conditions, while ice storms make roads treacherous. Summer and fall offer excellent driving conditions, though fall foliage season brings heavier traffic on scenic routes. Spring can bring unpredictable rain and residual freeze-thaw damage to road surfaces.

Best Time to Drive Longueuil to Ottawa

For shorter trips like this 138-mile drive, morning departures typically offer the best conditions with lighter traffic and better visibility. Avoid rush hour periods (7-9 AM and 4-7 PM) if possible.

Driving Strategy

At 138 miles, the Longueuil to Ottawa drive is short enough to complete in a single stretch. Still, check conditions along the route before you leave — a quick glance at live traffic cameras can confirm road visibility and surface conditions. If bad weather is forecasted for a narrow window, adjusting your departure by even an hour can make a significant difference in safety.

Frequently Asked Questions