Kansas is about 344 times bigger than Saint Lucia.

Saint Lucia is approximately 616 sq km, while Kansas is approximately 211,900 sq km, making Kansas 34,299% larger than Saint Lucia. Meanwhile, the population of Saint Lucia is ~167,122 people (2.7 million more people live in Kansas).
Tip: This to-scale comparison of Saint Lucia vs. Kansas uses the Mercator projection, which distorts the size of regions near the poles.