Ryanair has said it plans to cancel 150 flights flying to and from Germany on Wednesday due to a 24-hour strike.

Ryanair pilots working at German airports will be walking out and are among many other pilots striking over the summer from Sweden, Ireland, Belgium and the Netherlands.

The unions have warned it would be “the biggest strike action the company has ever seen”.

The budget airline managed to achieve a deal with Irish pilots and hopes it can secure further deals with other European employees.

The airline said Wednesday’s strikes would “damage Ryanair’s business in Germany” and described them as “unnecessary”.

Ryanair’s chief marketing officer Kenny Jacobs said: “These are wildcat strikes designed to cause maximum disruption to our customers and maximum damage to the Ryanair business.”

A Ryanair spokesperson said to The Independent: “Since we have already offered local contracts and improved pay there is no justification for further disruption and we are calling on our German pilots to work this Wednesday.”

The Vereinigung Cockpit pilot union have said the Irish airline has refused to meet their demands.

Ingolf Schumacher, head of industrial relations at the Vereinigung Cockpit pilot union, said: “Despite the strong signal of the strike action at the beginning of August, negotiations have come to a standstill. We are ultimately expecting solutions.”

The airline has insisted that it has offered more local contracts and pay rises for the pilots working in Germany.

“It is unacceptable that a union representing Ryanair’s German pilots, who earn up to €190,000 a year and work a five-day week followed by a four-day weekend, is now threatening customers’ travel plans at short notice,” said Jacobs. 

The airline has faced multiple strikes this year. In August, 450 flights were cancelled in a one day strike. Pilots in Germany, Belgium, Ireland and Sweden staged coordinated walkouts, which affected 75,000 passengers.

Shares in the group (LON: RYA) are currently trading down 0.91 percent at 13,09 (1501GMT).