Las Vegas is about 2.7 times bigger than Saint Paul.

Saint Paul is approximately 135 sq km, while Las Vegas (map shows its 26 named neighbourhoods; the area covers the whole city) is approximately 367 sq km, making Las Vegas 173% larger than Saint Paul.
Tip: This to-scale comparison of Saint Paul vs. Las Vegas 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.