The Wenatchee Valley College student told KOMO-TV: 'All of the sudden there was like 8-inch flames coming out of my phone.
'And I flipped it off onto the ground and it got under someone's seat, and the flames were just getting higher and a bunch of people stood up.'
It is unclear whether Crail had been watching a movie on her phone, or enjoying the airplane's in-flight entertainment.
While hoverboards have been banned from planes due to their highly flammable lithium batteries, an aviation expert told KOMO it is improbable that smartphones will be prohibited anytime soon.
An Alaska Airlines spokesman said their staff members are well-trained to respond to emergency incidents.
No one was injured and the flight continued on to its destination.
Alaska Airlines has not determined the cause of the fire, and the Federal Aviation Administration is conducting an investigation.