Systems and methods for facilitating interactions between a travel website and a user device are provided. A described system includes a user device configured to receive itinerary-specific data and instructions for performing a travel-related action from a remote server. The instructions may include multiple lines of computer code for automatically navigating a particular travel website and multiple lines of computer code for automatically providing the itinerary-specific data to the travel website. The user device includes a web browser configured to receive and load a website file from the travel website. The user device is configured to inject the instructions for performing the travel-related action into the loaded website file and execute the instructions injected therein. Executing the instructions causes the user device to automatically perform the travel-related action.