A quick itinerary for seeing the Old Port.

A 6-hour layover in Montreal is enough time to experience the city's charm, especially the iconic Old Port area.
0:00 - Arrive, retrieve bags if needed, clear customs. 0:30 - Depart airport for downtown. 1:00 - Arrive Old Port area. 3:00-5:30 - Explore and enjoy activities. 5:30 - Depart for airport. 6:00+ - Check in for next flight.
Use the 747 Express Bus ($11.50) for the cheapest option. Takes 45 minutes from airport to downtown. Taxi or Uber available but more expensive. Plan departure 2 hours before next flight.
Old Port (Vieux Port): Historic cobblestone streets, water views, restaurants. Basilica-Cathedral Marie-Reine-du-Monde: Stunning architecture. Saint Lawrence Boulevard: Shopping and street culture. Saint Paul Street: galleries and local shops.
Bagels from local bagel shops are Montreal iconic. Poutine from street vendors. French cafes for quick meals. Restaurant recommendations vary by layover time and budget.
Walking the cobblestone streets and soaking up atmosphere. Visiting the waterfront and port. Photography opportunities. Shopping local boutiques. Enjoying street art and murals.
Confirm you have sufficient time between flights. Delays happen; build buffer time. If luggage is checked through, you can't access it. Water/bathroom access before departing downtown area.