In the 2000s, Wadjda, a spirited 10-year-old living in Riyadh, dreams of owning a green bicycle that she passes at a store every day on her way to school. She wants to race her friend Abdullah, a boy from her neighborhood, but riding bikes is frowned upon for girls and Wadjda's mother refuses to buy one for her. The bike is expensive, costing SR800 (~$213).
Wadjda begins to earn the money herself by selling mixtapes, hand-braiding bracelets for classmates, and acting as a go-between for an older student. These activities get her into trouble with the strict headmistress. Her mother, meanwhile, is dealing with a job that has a terrible commute with a driver who often gets angry with her for making him wait. He tells Wadjda's mother that he will no longer drive her to work, but Wadjda and Abdullah find where the driver lives and visit his house to tell him to take her mother's business. After Abdullah threatens to have his uncle deport the driver, he agrees.
Meanwhile, Wadjda's grandmother on her father's side is looking for a second wife for her son because Wadjda's mother cannot have any more children and Wadjda's uncle wants a son. Wadjda's mother is angry and scared by this, so she tries on a beautiful red dress for her brother-in-law's wedding to gain support and to "scare off" any potential women who may consider marrying him.
At school, Wadjda decides to join the religion club to participate in a Quran recital competition featuring a SR1,000 cash prize (equivalent of about US$270[12]). Meanwhile, two girls at the madrasa caught by the headmistress for adorning themselves with nail polish and marker-drawn ankle tattoos are surprised when Wadjda, in keeping with her new pious image, does not stand with them by testifying in their favor. Wadjda's efforts at memorization impress her teacher, and she wins the competition. The staff and students are shocked when Wadjda announces her intention to buy a bicycle with the prize money. The headmistress is furious, and instead donates the reward to Palestine against Wadjda's will.
Abdullah offers Wadjda his bike (which she does not accept) and says he wants to marry her when they are older. Wadjda returns home to find her father and begins crying when he says he is proud that she won the competition. After a brief conversation, he asks Wadjda to tell her mother that he loves her, and leaves the house to take a phone call. Later, Wadjda finds out that her father has taken a second wife as she joins her mother in viewing the wedding ceremony from their rooftop. Wadjda suggests that her mother could buy the red dress and win her father back again, but her mother reveals that she has instead spent the money on the green bike her daughter wants. The two hug as fireworks from the wedding light up the night sky behind them.
The next day, Wadjda rides down the street on her new bike. The owner of the bike shop sees her passing and smiles. She races Abdullah and wins.
