How to Upgrade Korean Air flight?

Korean Air provides 2 different modes to make an upgrade to their seat and avail of a higher cabin class by utilizing the direct payment option or making an upgrade through miles. However, the airline provides seat upgrades to limited travel classes only that include, economy flex, prestige plus or flex fare on international flights, and economy flex fare for domestic. For additional details about Korean Air seat upgrade benefits and guidelines visit its official website or refer to the blog mentioned earlier.