As a result of pay disputes, pilots are picketing in Ireland, Germany, Belgium, Sweden and the Netherlands.
Some 55,000 are estimated to have been affected by the strikes, according to Ryanair
In Ireland, it is the fifth strike and, today, 20 flights on Irish routes were cancelled.
German operations were most affected by today’s strike, with around 480 crew members absent, leading to 250 flights being cancelled across ten airports.
As many as 22 flights could be affected in the Netherlands, in Eindhoven routes, though Ryanair has said no Dutch flights have been cancelled.
Overall, Ryanair expects that it will still operate more than 2,000 flights normally today.
In London, Ryanair shares were down around 0.3%, changing hands at €13.44 each in Friday’s early deals.