Yes, it is mandatory to print a copy of the approved K-ETA to present to board a flight to South Korea and to border authorities on arrival, alongside your passport.
People Also Ask
From April 1, 2023, to December 31, 2024, the Korean Electronic Travel Authorization (K-ETA) is not required for US citizens for stays of 90 days or less that are for tourism or business purposes. Visa required for all other purposes, including employment, teaching English, and for stays longer than 90 days.