Indonesia is about 1.3 times bigger than Alaska.

Alaska is approximately 1,481,348 sq km, while Indonesia is approximately 1,904,569 sq km, making Indonesia 29% larger than Alaska. Meanwhile, the population of Alaska is ~710,231 people (276.6 million more people live in Indonesia).
Tip: This to-scale comparison of Alaska vs. Indonesia uses the Mercator projection, which distorts the size of regions near the poles.