Indianapolis is about 1.5 times bigger than Seoul.

Seoul is approximately 605 sq km, while Indianapolis is approximately 935 sq km, making Indianapolis 54% larger than Seoul.
Tip: This to-scale comparison of Seoul vs. Indianapolis uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.