Seoul is about 1.4 times bigger than New Orleans.

New Orleans is approximately 439 sq km, while Seoul is approximately 605 sq km, making Seoul 38% larger than New Orleans.
Tip: This to-scale comparison of New Orleans vs. Seoul 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.