Wellington is about 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 Wellington (map shows its 57 named neighbourhoods; the area covers the whole city) is approximately 444 sq km, making Wellington 439% larger than The Hague (Den Haag).
Tip: This to-scale comparison of The Hague (Den Haag) vs. Wellington uses the Mercator projection, which distorts the size of regions near the poles.
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