Rani (Kangana Ranaut) is a 24-year-old Punjabi girl living in Rajouri Garden, Delhi. She is from a very conservative family; her brother escorts her everywhere for her safety. Two days before her marriage, her fiancé Vijay (Rajkummar Rao) meets with her in a local cafe to tell her he no longer wants to marry her, claiming he has changed, and she would not match his lifestyle anymore. Shocked at the development, Rani shuts herself in her room for a day.
She decides to take control of her life and plans to go alone on her pre-booked honeymoon to visit her favourite place, Paris - which she'd never seen before - and Vijay's favourite place, Amsterdam. After initially hesitating, her parents agree and Rani departs.
In Paris, she meets Vijayalakshmi aka Vijay (Lisa Haydon), who has a French/Spanish mother and an Indian father and works at the hotel where Rani is staying. Overwhelmed by Paris and having gotten into trouble twice - once with the local police and once with a robber - Rani soon makes up her mind to return to India. However, Vijayalakshmi becomes her friend and confidante and shows her around Paris. The two have a series of adventures, during which Rani relives the memories of Vijay patronising her and forbidding her from dancing and drinking - which she's free to do in Paris. Once while shopping, Rani tries out what she considers to be a revealing outfit and accidentally sends a selfie of her in it to Vijay instead of Vijayalakshmi. She quickly realises her mistake, but unbeknownst to her, the selfie prompts Vijay to begin searching for her.
Eventually, the time comes for her to bid an emotional farewell to Vijayalakshmi and board the train for Amsterdam. However, when she arrives in Amsterdam, she finds to her horror that her hostel room is to be shared with three guys, Taka, Tim and Oleksander. Soon, the four become good friends and explore the city, spending their days shopping, sight seeing, visiting a sex shop, and meeting pole dancers in a club. Rani's character gains self-confidence here, as she drives her friends home when they're drunk and earns money in a cook-off by selling gol gappa. She learns more about her friends' backgrounds and begins to understand how different life can be for people in other parts of the world.
As the four head home from the cook-off, they find Vijay waiting for Rani in front of the hostel. He apologises and asks her to reconsider the relationship. The conversation gets physical as he tries to grab Rani, but her friends retaliate, and she tells him to leave.
The two meet up the next day to talk, but Rani leaves abruptly, saying that she would rather speak with him in Delhi. Instead, she meets up with her friends one last time at a rock show she had previously chosen not to attend. After bidding an emotional farewell to her friends at the show's end, Rani returns to Delhi as a changed person.
Upon returning to India, she meets up with Vijay at his house. Without saying anything, she simply hands him her engagement ring and thanks him. Rani leaves his house relieved and relaxed.