A Frontier Airlines Airbus A321 airplane goes down the runway at Los Angeles International Airport on Jan. 2, 2025, in Los Angeles, California.

Kevin Carter | Getty Images News | Getty Images

Frontier Airlines reported a 71% increase in airfare in the third quarter as the country's largest budget airline tried to pass along an even bigger jump in jet fuel prices.

Frontier's fare revenue averaged $67.82 per passenger in the third quarter, compared with $39.74 last year. Including the budget airline's many fees, such as for checked and carry-on luggage, total revenue per passenger rose 30% on the year to $138.22.

Customers kept booking despite the higher prices. Frontier's passenger count rose 18% to more than 9.8 million people in the quarter. That's a difference of 1.5 million passengers from last year.

The company said demand remains strong, even at these higher prices, but Frontier still lost money as it took a $134 million charge tied to the return of some Airbus aircraft.…