Las Vegas is about 1.2 times smaller than Montreal.

Montreal is approximately 432 sq km, while Las Vegas is approximately 367 sq km, making Las Vegas 85.14% the size of Montreal.
Tip: This to-scale comparison of Montreal vs. Las Vegas uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.