Denver is about 1.5 times smaller than Seoul.

Seoul is approximately 605 sq km, while Denver is approximately 396 sq km, making Denver 65.5% the size of Seoul.
Tip: This to-scale comparison of Seoul vs. Denver 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.