Alaska is about 1.3 times smaller than Indonesia.

Indonesia is approximately 1,904,569 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 77.78% the size of Indonesia. Meanwhile, the population of Indonesia is ~277.3 million people (276.6 million fewer people live in Alaska).
Tip: This to-scale comparison of Indonesia vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.