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The airport is roughly 20 km west of downtown. The STM 747 bus runs 24 hours to downtown; taxis and ride-hailing are also available, typically taking 20 to 40 minutes depending on traffic.
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Fares are often lower in late fall, winter (outside holidays) and spring. Summer festival season is busiest.
The 747 express bus runs around the clock; taxis and ride-hailing are also common.
Yes, US-bound travelers clear US customs at Montréal-Trudeau.
Often in the shoulder seasons and winter outside holidays.