Buenos Aires is about 33 times smaller than Ho Chi Minh City.

Ho Chi Minh City is approximately 6,773 sq km, while Buenos Aires is approximately 203 sq km, making Buenos Aires 3.0% the size of Ho Chi Minh City.
Tip: This to-scale comparison of Ho Chi Minh 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.