Cuba is about 13 times smaller than Alaska.

Alaska is approximately 1,481,348 sq km, while Cuba is approximately 110,860 sq km, making Cuba 7.48% the size of Alaska. Meanwhile, the population of Alaska is ~710,231 people (10.3 million more people live in Cuba).
Tip: This to-scale comparison of Alaska vs. Cuba uses the Mercator projection, which distorts the size of regions near the poles.