The flight left Oslo at 7.42am central European time and was scheduled to land at London's Stansted Airport but pilots in control of the Boeing 737-800 made an emergency call just before landing.
The flight had left the Norweigan airport on time and was on route to London when pilots used their squawk 7700 code signal to declare an emergency.
Ryanair have confirmed it was a "medical emergency" was due to an sickness on board the flight after a member of the cabin crew became ill.
They also confirmed that they had to call for an ambulance to meet the aircraft upon landing.
The flight was supposed to land at 8.42am this morning
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Ryanair the budget carrier flies all over Europe
The plane was travelling at approximately 38,000 ft when the emergency was transmitted to air traffic control and was around 39 minutes away from landing.
The flight was in the air for two hours and two minutes in total after leaving Oslo's Gardermoen airport.
According to live radar the aircraft declared an emergency
It was the aircraft's second flight of the day having initially flown from Vilnius, Lithuania’s capital to Oslo before it left for London.
It regularly flies all over Europe and made four flights yesterday including a trip from Paris and to London.
A spokesman for the airline said: "The crew of this flight from Oslo to London Stansted (2 Feb) requested medical assistance upon landing after one of the cabin crew became unwell. The aircraft landed normally and the crew member received medical assistance."
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