Boston is about 1.8 times bigger than Winterthur.

Winterthur is approximately 68 sq km, while Boston is approximately 124 sq km, making Boston 82% larger than Winterthur.
Tip: This to-scale comparison of Winterthur vs. Boston 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.