When passengers purchased tickets for Tui Airways flight 4651, they thought it would take them from Calabria in southern Italy to London Gatwick.
However, when the aircraft departed on Saturday after a two-hour delay, it took them to North Africa.
The 737 aircraft was intentionally diverted from London to a town in Tunisia during the weekend to make an important delivery, the Independent reported.
On Saturday morning, passengers were warned their flight could make a stop at an airport in Enfidha, on Tunisia’s east coast, to drop off a part for another aircraft.
Sure enough, after a two-hour delay, the flight flew an hour to Enfidha, where it spent another hour dropping off a part and refuelling. Eventually, the flight began its journey to Gatwick and arrived four hours late.