Las Vegas is about 4.5 times bigger than The Hague (Den Haag).

The Hague (Den Haag) (excluding the city's 15.68 sq km of water area) is approximately 82 sq km, while Las Vegas is approximately 367 sq km, making Las Vegas 346% larger than The Hague (Den Haag).
Tip: This to-scale comparison of The Hague (Den Haag) vs. Las Vegas uses the Mercator projection, which distorts the size of regions near the poles.