Delta One upgrade to Seoul for $17.34: check your upgrade pricing now.

A Delta customer scored a $17.34 upgrade from Premium Select to Delta One on the 15+ hour Atlanta to Seoul Incheon flight. The upgrade pricing had been $1,671 just minutes earlier — a nearly 99% drop likely caused by a pricing glitch after an itinerary change. This highlights how dynamic upgrade algorithms can produce extreme deals, so frequent checks pay off.

The play: Monitor your Delta upgrade offers regularly, especially after making any itinerary changes, and book immediately if you see a price that seems too good to be true.