Salt Lake City is about 1.4 times smaller than Vienna.

Vienna is approximately 415 sq km, while Salt Lake City is approximately 287 sq km, making Salt Lake City 69.24% the size of Vienna.
Tip: This to-scale comparison of Vienna vs. Salt Lake City 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.