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

Salt Lake City is approximately 287 sq km, while Buenos Aires is approximately 203 sq km, making Buenos Aires 70.79% the size of Salt Lake City.
Tip: This to-scale comparison of Salt Lake City vs. Buenos Aires 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.