First-class seats will be in the first two rows of the aircraft, with up to 37 inches of pitch. Extra-legroom seats will be in rows three through eight, with up to 34 inches of pitch. In-seat power connections will be limited to the first eight rows.
The changes are part of the airline's effort to improve the onboard experience. Other upgrades include Starlink Wi-Fi.
"We're transforming what customers can expect when they fly Frontier," chief marketing officer Bobby Schroeter said.