Originally Posted by
goodeats21
Airfare is very dynamic. Yes, it can and does change in the middle of the day.
Note that the fare buckets are only one part of the equation needed. The other is the actual fare filing. In this case, seems there are still G fares in the bucket, but something is preventing a G fare being sold for your route.
If you post the specifics (date, route), someone may be able to provide further illumination.
Itinerary was for:
11/11 ORD-LAX UA531
11/15 LAX-ORD UA269
Before the fare change, it was for $138 for a G-fare. Now, it's at $236 for a K-fare. Still a pretty decent price but $100 more :-)