The strikes are planned for 24-30 June and 1-2 July according to Bloomberg UK.

Union Sindical Obrera (USO) said it was coordinating strikes with other European unions in Belgian, France, Portugal and Italy, to protest the “precarious working conditions”.

The move follows unsuccessful negotiations between itself, another Spanish union SITCPLA and Ryanair.

In a statement released last month USO said the airline had made few changes to its working conditions since the first European level strike in 2018.

In response to the announcement a Ryanair spokesperson said: “We have negotiated collective agreements covering 90% of our people across Europe. In recent months we have been negotiating improvements to those agreements as we work through the Covid recovery phase. Those negotiations are going well and we do not expect widespread disruption this summer.”

The budget carrier said it had reached an agreement with Worker’s Commissions (CCOO), the largest trade union in Spain. Ryanair added the negotiations with the organisation to deliver improvements for Spanish-based cabin crew and reinforce the airline’s commitment to the welfare of its cabin crew had been successful.

The spokesperson continued: “Recent announcements by the much smaller USO and SITCPLA unions are a distraction from their own failures to deliver agreements after three years of negotiations and we believe that their strike calls will not be supported by our Spanish crews.”