There are several modes to book a multi city flight on Aer Lingus, but it is available on limited routes. Flyers can book it online through the official website, or they can seek help from the airline's expert in the customer service team. The multi city flights Aer Lingus makes the hassle of booking separately smooth and saves more for their trip. For detailed information on multi city flight bookings, one can read the blog by Airlines Group Travel at the provided link.