As the festive season draws near, James and Hayley, who have remained a couple since the events of the earlier movie, find themselves invited to a holiday retreat in the breathtaking Austrian Alps by their families—the Hugheses and the Taylors. However, trouble brews when Hayley's father, ever the maverick, insists on seeking unconventional lodging, much to the dismay of James's family.
Upon landing at the airport, the families’ shuttle services become hilariously intertwined, ultimately leaving the working-class Taylors at the lavish Hugheses' resort, while the Hugheses themselves are accommodated in a modest hostel. Amidst the chaos, Hayley discovers an engagement ring that she presumes to be intended for her from James (though it actually belongs to his father), leading her to mistakenly believe he is about to propose.
After a night marked by this unexpected arrangement, the families finally gather at the resort and embark on a thrilling skiing adventure. Eager to keep pace with James's childhood friend Bea, Hayley finds herself in over her head, resorting back to the gondola as she watches James and Bea expertly carve their way down the snowy slopes.
Meanwhile, Hayley's father inadvertently reveals his suspicions about her expectations for a proposal during a heated discussion with Diane, who has confided in Hayley about her ambition to pursue a film school scholarship in Los Angeles. Later that night, Hayley inadvertently catches James rehearsing a proposal for Bea, leading her to mistakenly believe he is proposing to her instead.
When James eventually finds Hayley and makes his move, she, wary of his intoxicated state, is doubtful about his intentions and ultimately rejects him. Misled into thinking it was James's father who intended to propose to Diane, she decides to break off their engagement and storms off with her family, leaving the hotel in disarray.
The following morning, the Hugheses are determined to make things right. However, the Taylors have already made their exit. In a frantic dash to the airport, they manage to catch up with the plane just in time. James races to make amends with Hayley, and as both families regroup at the resort, they collectively resolve to rekindle their holiday spirit and create lasting memories.
As the enchanting ambiance of Christmas morning envelops them, James's father drops a stunning revelation that reshapes his understanding of the past. The stunning engagement ring, previously believed to be for Diane, was always meant for James, symbolizing a future together with Hayley. This revelation sends waves of realization through James as he gazes at the radiant gemstone, now infused with a profound significance.
Throughout the holiday, as the family exchanges gifts, James and Hayley’s presents carry deeper meanings. His heartfelt gift—a key to his apartment—represents the potential of their enduring relationship, while Hayley’s card reveals her true intentions: she had always planned to propose to him. With his father's heartfelt words swirling in his mind, James embraces her proposal with an overwhelming sense of joy and gratitude, setting the stage for a beautiful future together.
