Britannia set sail from the city’s port on Friday for a two-week sailing.
After departing, the ship was due in Invergordon on Monday but arrived a day early due to a medical incident.
The P&O Cruises liner sailed into the port of the Scottish town on Sunday evening.
Although the incident sparked concern, the operator confirmed the early Highland arrival was done so “necessary medical care” could be received.
A spokesperson for P&O Cruises said: “I can confirm that Britannia arrived early into Invergordon to ensure that a guest received appropriate, necessary medical care.
“Britannia is on a 14 night British Isles cruise which left Southampton on Friday.”
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The nature of the incident was not confirmed by P&O.
The 10-year-old vessel is currently sailing towards Stornoway before departing for Belfast on June 14.
It will then sail to Liverpool and Cobh-Cork in Ireland, before returning to Southampton on June 20.
The passenger capacity of Britannia is 3,647 passengers, alongside a crew of 1,398.