How Can I Book a United Airlines Multi-City Flight? Booking a United Airlines multi-city flight is simple. Visit the United Airlines website and select the "Multi-City" option. Enter your departure city, final destination, and any stopovers or additional cities you plan to visit. Customize travel dates, cabin class, and flight preferences. Review your itinerary, confirm the details, and complete the booking. United Airlines' user-friendly website streamlines the process, making it easy to plan multi-city trips for leisure or business. Explore multiple destinations seamlessly, all within a single booking.