Arizona is about 478 times bigger than Saint Lucia.

Saint Lucia is approximately 616 sq km, while Arizona is approximately 294,312 sq km, making Arizona 47,678% larger than Saint Lucia. Meanwhile, the population of Saint Lucia is ~167,122 people (6.2 million more people live in Arizona).
Tip: This to-scale comparison of Saint Lucia vs. Arizona uses the Mercator projection, which distorts the size of regions near the poles.