multi-city flight; open-jaw itinerary
Travel industry term for a flight itinerary that includes multiple destinations, not a simple round trip. Often used when booking flights that arrive in one city and depart from another, or that include several stops.
I booked a multi-city flight ticket visiting Tokyo, Osaka, and Fukuoka.
This travel agency also handles open-jaw itinerary plans.
往復 means a round trip (out and back), while 自由旅程 refers to a more complex itinerary with multiple cities or an open-jaw routing.
片道 is a one-way ticket, whereas 自由旅程 is a single booking that covers several legs, often with different arrival and departure cities.
Compound of 自由 (free, unrestricted) and 旅程 (itinerary, journey). The term appears to be a modern coinage used in the travel industry to describe flexible, multi-stop flight bookings.