Kyle Pratt, played by Jodie Foster, is a propulsion engineer living in Berlin, grappling with the tragic loss of her husband David, who died after a fall from a roof at an avionic manufacturing facility. In a desperate attempt to start anew, she and her 6-year-old daughter, Julia (Marlene Lawston), are set to return to New York. Their journey takes place aboard an Elgin 474, an aircraft Kyle assisted in designing, now in the hands of Aalto Airlines.
After a few hours of sleep, Kyle awakens in a state of dread—Julia is nowhere to be found. Initially striving to keep her composure, panic soon envelops her as Captain Marcus Rich (played by Sean Bean) is compelled to initiate a search for her missing daughter, while air marshal Gene Carson (portrayed by Peter Sarsgaard) keeps a watchful eye on her. The investigative atmosphere quickly turns grim; Julia's boarding pass has vanished, her seat is marked as empty, and the vigilant flight attendant, Stephanie (Kate Beahan), shockingly reports that there is no record of Julia boarding the plane. To make matters worse, no passengers recall seeing Julia.
Frustration boils over as Kyle confronts two Arab men she suspects of stalking her daughter, inciting chaos and ultimately leading to her being restrained. Despite her pleas, Marcus, suspicious of her mental state due to her recent losses, denies any further examination of the cargo, which only heightens her feelings of despair and isolation. An unsympathetic flight attendant adds to her torment as Kyle’s erratic behavior leads to her being confined to her seat—under the watch of Gene Carson, who must now escort her in handcuffs.
In a heartbreaking twist, Captain Rich receives a reported message from a Berlin hospital claiming that Julia perished alongside her father, thus convincing him that Kyle, overcome with grief, has conjured the presence of her daughter solely in her mind. Confined and uncertain, Kyle tries to regain her sanity until a glimmer of hope arises when she notices a heartfelt drawing—a heart made by Julia—forming on the condensation of her window.
Kyle requests a trip to the bathroom and cleverly seizes the opportunity to escape into the overhead compartment, where she sabotages the airplane's electronics. What follows is a harrowing series of events that leads her to David's casket in the freight area, fearing the worst and suspecting that Julia could be inside. Instead, the grim discovery of her husband's body greets her. Soon, she finds herself back in her seat, handcuffed and informed of an emergency landing at Goose Bay Airport in Newfoundland and Labrador, where authorities await.
In an act of desperation, Kyle implores Carson for one last chance to search for Julia upon landing. As Carson contemplates her request, it becomes clear his intentions are dark; he sneaks into the freight compartment to disarm explosives hidden within David's casket, all while Julia is left drugged and asleep. It soon dawns on Kyle that Carson, Stephanie, and a Berlin coroner are entwined in a sinister plot, framing her for a crime she did not commit.
Declaring Kyle a hijacker, Carson lies to the captain, asserting she is threatening to explode the aircraft unless a hefty ransom is met. The conspirators' cold machinations aim to eliminate both Kyle and Julia. With a final, desperate emergency landing at Goose Bay, Kyle finds herself in a game of survival. She makes a bold move—by claiming to be a hijacker, she keeps Carson aboard while the innocent crew disembarks.
In a flurry of action, Kyle knocks Carson unconscious and seizes the detonator, wrestling against the clock as Stephanie makes a shocking reappearance. Gripped by fear, Kyle must confront the dangerous reality that Carson and Stephanie orchestrated tragic events leading back to David and Julia. As they navigate through the aircraft, Kyle eventually discovers the unconscious Julia; a fierce chase ensues as Carson reveals the horrific truth behind his actions.
In a brave act, Kyle detonates the explosives, eliminating Carson entirely while ensuring both she and Julia survive. With the truth now evident to the crew, they finally recognize Kyle's valor and her unwavering fight for her child.
The following morning, as Kyle cradles Julia in her arms at the airport, Captain Rich extends his profound apologies for the harrowing ordeal. Meanwhile, the law closes in on the conspirators, ensuring justice for the crimes committed. A sense of redemption washes over Kyle as she departs the airport, navigating through a sea of passengers who honor the resolution of her nightmare. As she prepares to leave, Julia stirs awake, joyfully inquiring, “Are we there yet?” as they embark on their new journey together, free from their dark past.
