United quietly introduced baggage fee increases on May 14 for flights on or after June 10. They have increased the first and second checked bag fees to $20 and $30 respectively for those who chose to check in at the airport. If you check in online and pay for your bags online the fees remain at $15 and $25. These fees are in effect for travel within the 50 states and to Puerto Rico, the U.S. Virgin Islands and Canada.
See all of United’s bag fees here.