Raj and Simran are NRIs living in London, though they couldn’t be more different. Simran hails from a middle-class family, is shy and reserved, and bound by the rules set for her family by father-patriarch, Baldev. Raj is brash like his father, a successful businessman, who regrets spending his youth chasing wealth. Fate brings Raj and Simran together at the start of their backpacking trips to Europe. Simran is late for her train and Raj helps her board at the last minute, pulling her off the platform and into a compartment.
Rather than be thankful, Simran ignores Raj until she reunites with her friends aboard the train. Their groups cross paths multiple times in Europe, until both Raj and Simran miss their connecting train to Zurich. Forced to travel together to catch up with their groups, they learn about each other's lives. Raj is a rover and does not see himself settling down, while Simran is betrothed to Kuljeet from her hometown, Punjab, despite never having met him. Their match was arranged by Baldev and Kuljeet’s father, while Simran was still a child. Nevertheless, Simran falls in love with Raj by the end of the trip. Raj feels similarly, so refuses Simran's invitation to her wedding.
A few weeks later, Simran’s family is in Punjab to prepare for the wedding. Simran is repulsed by Kuljeet’s misogyny and chauvinism, but plays along for the sake of her parents. One day, Kuljeet brings home his new friend, Raj, recently moved from London. Kuljeet is unaware that Raj is here to take his 'bride' (lit. dulhania) Simran, not by eloping but by winning over her family. He goes about impressing everyone in the house with his warm and playful nature. Baldev recognises Raj from a previous meeting in London at his store, but says nothing.
The wedding date is moved up on the wishes of Simran’s dying grandmother. Raj stubbornly refuses to elope, despite Simran's own mother being in favour of it after learning the truth. The next morning, Baldev discovers their secret. Enraged that Raj is here to interfere with the wedding, Baldev has him thrown out. Kuljeet shows up at the train station seeking revenge for Raj betraying him. A fight ensues, and Raj gains the upper hand. He spares Kuljeet’s life, then boards the train departing from the village. Simran begs Baldev to let her go with Raj; finally, he relents, realising that Simran will not be happy with Kuljeet.
As with their first meeting, Simran almost misses the train, which is about to leave the station. Raj pulls Simran aboard at the last minute, and they rejoice finally being together. As end credits roll, they are shown living happily as a couple in London.
