The general term for such flights is "direct flight":
A direct flight in the aviation industry is any flight between two points by an airline with no change in flight numbers, which may include a stop at an intermediate point. The stop over may either be to get new passengers (or allow some to disembark) or a technical stop over (i.e., for refuelling).
If there aren't any passengers getting off then it's a "technical stop":
Technical stop. A stop most commonly used to refuel the aircraft, to make unexpected essential repairs or to respond to some emergency need to land the aircraft. No traffic is unloaded or loaded during a technical stop.
If the flight is handled by a foreign airline, then it's also a "fifth freedom flight":
Fifth freedom flight. The right to fly between two foreign countries on a flight originating or ending in one's own country. Example: a flight from Greece to China, flown by a Chinese airline, with a full stop in Munich. Passengers and cargo may board or disembark the flight in Munich, with no intention to continue the flight to Beijing