It was reported that passengers were booking $0 tickets and paying roughly $10 with taxes. Other fares were between $5 and $10.
On Friday, the airline tweeted that they would honor the massively mispriced tickets.
We’ve reviewed the error that occurred yesterday and based on these specific circumstances, we will honor the tickets.
— United (@united) September 13, 2013
The airline similarly honored tickets one day in 2008 when the airline accidentally dropped a $130 fuel surcharge.