PLOT

Six years after the flight 180 explosion and 5 years after the pile-up on Route 23, Wendy Christensen (Mary Elizabeth Winstead), a soon-to-be graduate and the school photographer at McKinley High School, visits an amusement park with her friend Carrie Dreyer (Gina Holden), Carrie's boyfriend Kevin Fischer (Ryan Merriman) and her boyfriend, Jason Wise (Jesse Moss), before their graduation. As they board a roller coaster, Wendy has a premonition that it will crash, killing everyone. Wendy convinces Kevin, fellow high school students Ian McKinley (Kris Lemche), Erin Ulmer (Alexz Johnson), Lewis Romero (Texas Battle), Ashley Freund (Chelan Simmons), Ashlyn Halperin (Crystal Lowe), and McKinley High alumnus Frankie Cheeks (Sam Easton) to leave. The roller coaster starts and derails just as Wendy saw it, killing everyone on it, including Jason and Carrie.
As Wendy is preparing to leave for college, Kevin, who has researched the flight 180 disaster, tells Wendy of Alex Browning, who had a premonition and saved others on the plane. Before he can tell her about the survivors dying in the order they would have died on the plane, Wendy flees in her car. That afternoon, Ashley and Ashlyn go to a tanning salon for a party. Meanwhile, Wendy connects her camera to her computer, viewing the photos she took before the accident. Viewing an image of Ashley and Ashlyn that is overexposed so it appears as if the two are burning, she feels something is following her and tries calling Ashley, but she and Ashlyn are trapped in their sunbeds and burn to death.
After Ashley and Ashlyn's memorial service, Wendy tells Kevin that Death is after them. Wendy shows Kevin the photos she took at the amusement park, including Ashley and Ashlyn's, and tells him she believes the photos show how the survivors will die. While at a drive-thru, Wendy are Kevin are almost rammed by a truck. They realize that the driver in front of Kevin's truck was struck in the head by the cooling fan of Kevin's truck engine. They see the driver and realize it is Frankie, leading Kevin to believe Wendy. The next day they visit Lewis at the school gym. Lewis is unconvinced, and his head is later crushed by a weight machine. That night, the two visit Ian and Erin at a hardware store, but they think Wendy and Kevin are being paranoid. Meanwhile, Erin’s magnet causes some tools to start a forklift that tries lifting a shelf beside the group. While Ian tells them that Wendy should kill herself to save the others, planks of wood drop above him. Wendy intervenes, saving Ian. A plank of wood deflates a bag of sawdust which sprays into Erin’s eyes. She stumbles toward a nail gun that impales her.
The next morning, Wendy falls asleep after browsing through her photos for clues. Her sister Julie (Amanda Crew) secretly gets her bracelet from Wendy’s desk. As she and her friends Perry Malinowski (Maggie Ma) and Amber (Ecstasia Sanders) go to the Tri-Centennial, Wendy awakens. She sees the picture of another passenger in the roller coaster. As she zooms the image, she sees Julie’s bracelet on the passenger’s wrist, indicating that Julie and Perry or Amber are next. She calls Kevin, who is one of the security staff in the Tri-Centennial, to locate them. Kevin recalls to Wendy that they are next after Julie, Perry or Amber. As Wendy sets off to the Tri-Centennial, Ian follows her, seeking revenge for Erin’s death. Julie runs from Kevin after he spots her making out with some boys. As Wendy arrives, two pranksters accidentally free a horse who is scared by the fireworks. The horse gallops away with a rope still tied to it. Julie gets caught on the rope and dragged along the field. As she is about to be impaled by a harrow, Kevin saves her. When Wendy asks Julie about the person who sat beside her on the roller coaster, Perry stands up, and is impaled by a flagpole triggered by the horse. Wendy leaves, remembering that Kevin is next. Just as Kevin is about to be engulfed by a fire caused by a grill, Wendy saves him. As Wendy, Kevin and Julie depart, Ian arrives. They spot Ian who blames Wendy and states "I'm responsible for your death? Tell me how, so this will all end?". Shortly after an argument, some fireworks are launched toward the group, almost killing Wendy. They narrowly miss Ian, making him believe he will not die. As he states this, the fireworks break a cherry picker which crushes Ian.
Five months later, Wendy is waiting for a subway train. She decides to leave after spotting several omens on the train. At the doors, she notices Julie entering the train and decides to stay. Wendy tells Julie that she has a feeling that Death has not stopped hunting them. At the end of the train, she sees Kevin. The train derails after a rat breaks the subway's wire controls. As the three are separated, Julie is crushed by one of the train’s hubcaps. Kevin’s head is shredded into the subway’s walls after the glass he is leaning on breaks. The train separates, sending Wendy onto the track unconscious. As Wendy regains consciousness, she discovers her leg is broken and she cannot walk and a train is heading toward her. She awakens to realize the subway derailment was a premonition. She warns Kevin and Julie, and the three try to escape the train. The screen fades to black and the train derailment is heard.