way to get an idea of how busy Incheon International Airport
Here’s a great trick that you might find useful.
Here’s how to find out how busy Incheon International Airport is before you leave for your trip in South Korea.

You can search by terminal,
and you can get a preview of the congestion on each route.
If you follow the links below, you’ll find them very helpful
https://www.airport.kr/co/en/cpr/statisticPredictCrowdedOfInout.do

A Korean version is also available.
This is the most used Naver portal site by Koreans.

This is how you can get an idea of congestion ahead of time.
Thank you!Next time, we’ll provide some other useful information.
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