Frontier Airlines Flight Strikes, Kills Person on Denver Airport Runway

‍DENVER — A Frontier Airlines (F9) aircraft struck and killed a person on a runway at Denver International Airport (DEN) late Friday night, forcing the crew to abort takeoff and evacuate the aircraft.

The incident occurred at approximately 11:19 p.m. on May 8, 2026, as Frontier Flight 4345 was departing DEN for Los Angeles (LAX). Denver airport officials said the aircraft reported striking a pedestrian during takeoff on Runway 17L.

Emergency crews responded to the scene, and passengers were later bussed back to the terminal.

Person entered active airfield

DEN said the person had jumped the airport’s perimeter fence and was struck about two minutes later while crossing the runway. The person has not been identified and is not believed to have been an airport employee, according to the airport.

The airport also said it inspected the fenceline and found it to be intact. U.S. Transportation Secretary Sean Duffy said local law enforcement is investigating, with support from the Federal Aviation Administration (FAA) and the Transportation Security Administration (TSA).

Aircraft evacuated after engine fire

The aircraft, an Airbus A321neo, was carrying 224 passengers and seven crew members, according to Reuters. The impact caused a brief engine fire and smoke in the cabin, after which the crew rejected the takeoff and passengers evacuated the aircraft.

Twelve people reported minor injuries, and five were transported to local hospitals, according to DEN. The airport said the majority of passengers later departed on a new Frontier flight.

Flight-tracking data cited by Flightradar24 showed the aircraft reached a maximum speed of 127 knots before braking and stopping on the runway.

Investigation underway

Runway 17L was closed following the incident while investigators examined the scene. DEN said the National Transportation Safety Board (NTSB) and FAA had been notified, while Frontier said it was gathering information in coordination with airport and safety authorities.

The incident raises immediate questions about airfield perimeter security and runway protection at one of the busiest airports in the United States. For passengers, the most direct impact was the aborted departure, emergency evacuation, and subsequent rebooking.

For airport and federal investigators, the central question will be how a person was able to enter an active runway environment during a live departure sequence despite the airport’s fenceline appearing intact.