Union members in Spain, Italy, Portugal, the Netherlands and Belgium will take action for 24 hours in a row over the application of various national labour laws instead of Irish contracts.

Unions claim the strike will be bigger than the two-day walkout in July, which caused 600 cancellations, according to The Independent. A number of flights to UK and Ireland airports are likely to be cancelled.

However, Ryanair said “the vast majority of its cabin crew across Europe will work as normal”, adding it expected “a significant majority” of its cabin crew in Spain, Italy, Belgium, the Netherlands and Portugal to also turn up for work.

The announcement comes a day after a strike by Ryanair’s German pilots.

Ryanair’s chief marketing officer Kenny Jacobs said: “If there is a further unsuccessful cabin crew strike on the 28th September next then, as we demonstrated in Germany yesterday, Ryanair will pre-advise customers of a small number of flight cancellations, and the overwhelming majority of Ryanair’s flights and services that day will operate as normal.”