Can my customers book a multi city trip with three or four different flights on my website?

Yes, in most cases multi city trips can be searched and booked on your portal, though how well it works depends on the flight suppliers connected to your account. A multi city search gives your customer a separate line for each leg of the journey, each with its own origin, destination and date, so someone flying out to one city, on to another and then home can see the whole trip in one go instead of running three separate searches.

When the search comes back, the better outcome is a single priced itinerary from one airline or airline group, because that is cheaper to change later and travels as one ticket with one booking reference. Not every combination can be built that way. Fare rules are set by the airlines, so some routes simply cannot be combined into one ticket, and in those cases the results are put together from separate flights that are issued as separate tickets. Low cost airlines in particular are usually sold leg by leg rather than as part of a combined itinerary.

There are a few practical limits worth knowing. The number of legs allowed in one search varies by supplier, and long complicated trips take noticeably longer to return results. If the trip ends up as separate tickets, a delay on one leg does not protect the next one, and any change or refund has to be handled ticket by ticket under each airline's own rules.

Before you promote multi city on your site, ask which of your connected suppliers support it and how many legs they allow, then test two or three of the routes your customers actually ask for and check whether they come back as one ticket or several.