9 January 2012 Last updated at 13:15
Ryanair said the first officer landed the plane and a stand-by captain was called to operate the flight after a two-and-a-half hour delay.
A Newcastle Airport spokesman said the plane landed safely at about 20:45 GMT.
A Ryanair statement said: "FR9128 from Liverpool to Oslo Rygge diverted to Newcastle after the captain became unwell in-flight.
"The first officer landed the aircraft normally and a standby captain was called out to operate the flight, with a two-and-a-half hour delay.
"Ryanair apologises sincerely to the passengers on this flight for the resultant delay."
Would be interested to see if this Pilot has any stress and fatigue as a direct result of Ryanair Management.. As the flight was two-and-a-half hours delayed please give a thought for probationary cabin crew on this flight who did not get a any free drinks or paid a penny off Ryanair for this delay......
Exploitation of crew is Ryanair's priority....
Best wishes to the captain pilot on this flight...