Connecticut is about 1.6 times smaller than Slovenia.

Slovenia is approximately 20,273 sq km, while Connecticut is approximately 12,548 sq km, making Connecticut 61.9% the size of Slovenia. Meanwhile, the population of Slovenia is ~2.1 million people (1.5 million more people live in Connecticut).
Tip: This to-scale comparison of Slovenia vs. Connecticut uses the Mercator projection, which distorts the size of regions near the poles.