With 4 hours, stay close to Montréal–Trudeau International Airport (YUL). Clear immigration and security can easily take 60–90 minutes round‑trip, so avoid going downtown. Instead, relax at the terminal: explore the duty‑free and Québec‑made products shops, grab a smoked meat sandwich or poutine at a sit‑down restaurant, and use the free Wi‑Fi to catch up on work. If you want fresh air, take a short taxi or rideshare (10–15 minutes) to nearby Dorval Village for a quick stroll and coffee at a local café, then return early to re‑clear security. Keep an eye on boarding times—many international flights start boarding 45–60 minutes before departure.

With about 8 hours, you can see a slice of central Montréal. From YUL, take the 747 bus or a taxi to downtown (30–45 minutes). Start at Old Montréal (Vieux‑Montréal): walk around Place d’Armes, admire Notre‑Dame Basilica (allow time for security and possible lineups), and wander the cobblestone streets toward the Old Port (Vieux‑Port de Montréal) for St. Lawrence River views. If time allows, head up to the Plateau‑Mont‑Royal area for colorful row houses, murals along Boulevard Saint‑Laurent, and a quick bagel stop at St‑Viateur Bagel or Fairmount Bagel. Plan to leave downtown at least 2.5–3 hours before your next flight to account for traffic, airport check‑in, and security.

With 24 hours, you can experience several neighborhoods. Day 1: After arriving at YUL, take a taxi or 747 bus to your hotel downtown or in the Plateau. Explore Old Montréal: Notre‑Dame Basilica, Place Jacques‑Cartier, and the Old Port’s riverfront promenade. Have dinner nearby or in the Quartier des Spectacles, where you’ll often find festivals and live performances. Day 2: In the morning, head to Mount Royal Park (Parc du Mont‑Royal) for city views from the Kondiaronk Belvedere lookout. Then explore Mile End and Plateau‑Mont‑Royal for cafés, independent boutiques, and famous bagels. If you’re into museums, visit the Montreal Museum of Fine Arts (Musée des beaux‑arts de Montréal) or the Pointe‑à‑Callière Archaeology and History Complex. Sample local specialties like poutine, smoked meat, and maple‑based desserts before returning to the airport, leaving at least 3 hours before your flight.