Winterthur is about 6 times smaller than Montreal.

Montreal is approximately 432 sq km, while Winterthur is approximately 68 sq km, making Winterthur 15.78% the size of Montreal.
Tip: This to-scale comparison of Montreal vs. Winterthur 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.