A British plane heading from Egypt to Manchester Airport made an emergency landing at Athens Airport in Greece after the pilot fell ill.
The plane landed safely with no injuries to passengers
The Monarch flight from Luxor landed safely at 2256 local time (2056 BST).
Reports suggested the pilot had had a stroke but the airline did not confirm these. A spokeswoman later said he had been well enough to walk off the plane.
None of the 180 passengers on board the Boeing 757 was injured. They are due to return to the UK early on Tuesday.
The Monarch spokeswoman said: "They landed safely and everything was fine and he [the pilot] actually walked off the aircraft and is with paramedics now."
She said a replacement crew for the plane would be sent from Manchester because the whole crew of the original aircraft would have exceeded the limit on their working hours.