What Are The Rules For The Korean Air Seat Upgrade?

Korean Airlines offers seat upgrade services to enhance and improve the flying experience. However, to upgrade Korean Air flights, one needs to follow the rules and regulations below.
1. A seat can be upgraded when booking or after the reservation.
2. For domestic routes, economy normal fares are eligible for an upgrade, and for international routes, economy flex fares and prestige plus flex members.
3. Members of the frequent flyer program can upgrade their flight using miles.
4. If one makes changes in an upgrade, then points are deducted from the miles.
5. Upgrade is subject to the availability of seats in the airline.
Read more:
https://www.airlinesgrouptravel.com/blog/how-to-get-upgraded-on-korean-air