Salt Lake City is about 1.4 times bigger than Buenos Aires.

Buenos Aires is approximately 203 sq km, while Salt Lake City is approximately 287 sq km, making Salt Lake City 41% larger than Buenos Aires.
Tip: This to-scale comparison of Buenos Aires 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.