Maintain natural input hierarchy
It's beneficial to keep the departure and destination inputs together in the search bar for a couple of reasons. First and foremost, it aligns with the natural order and hierarchy in the booking journey. Users typically follow a logical sequence when planning their travel, making it more intuitive to input departure and destination details together.
Secondly, maintaining this order establishes consistency, which is crucial for gaining user trust. When users encounter a familiar and expected layout, it enhances their confidence in the booking process. This consistency streamlines their experience, requiring less time and effort to figure out how to achieve their primary goal — whether it's booking a flight, purchasing bus tickets, or reserving accommodation.

