Holidaymakers hoping to head off as schools wrap up term time at the end of June could find that their Ryanair flights are cancelled as more staff have said they will join in on strike action.
The news comes as two Spanish unions, USO and SITCPLA, have said their members would strike as they had "no other option" in order to secure better pay and working conditions.
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However, Ryanair said it expected that there would be no disruption to flights despite the strikes.
But now, more unions said they will join in on the organised strikes on June 25, with Italian unions FILT-CGIL and UIL Trasporti stating that they were also seeking improved pay and conditions.
The Italian unions warn that they have called a 24-hour strike and will join those in Spain and Portugal taking action - they warn that they are also expecting stoppages in both France and Belgium.
How the action will affect flights to and from Britain at the end of this month is unclear but disruption to some routes could happen - Ryanair previously said: "Ryanair has negotiated collective agreements covering 90 per cent 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. In Spain, we are pleased to have reached a collective agreement with CCOO, Spain’s largest and most representative union, delivering improvements for Spanish-based cabin crew and reinforcing Ryanair’s commitment to the welfare of its cabin crew.
"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."
Glasgow Live has reached out to Ryanair for comment.
