Saint Lucia is about 478 times smaller than Arizona.

Arizona is approximately 294,312 sq km, while Saint Lucia is approximately 616 sq km, making Saint Lucia 0.21% the size of Arizona. Meanwhile, the population of Arizona is ~6.4 million people (6.2 million fewer people live in Saint Lucia).
Tip: This to-scale comparison of Arizona vs. Saint Lucia uses the Mercator projection, which distorts the size of regions near the poles.