UPDATE: 12:25pm - Ryanair have issued a statement confirming that they've cancelled 24 flights between Ireland and the United Kingdom on Friday, July 20.
The dispute is over base transfers, promotions, leave and various other issues.
This decision comes after a pilot union refused to postpone its planned strike action for this Friday.
Apart from the above-mentioned strikes, Ryanair is also facing strikes by some of its pilots based in Ireland.
Next week's strike is nevertheless maintained, because no progress was made at the meeting, Elsen added.More news: Trump Sends Rouhani Dire Warning, All Caps
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Ryanair said the strike was unnecessary as it had already given the pilots written proposals that address their concerns over seniority.
Portuguese cabin crew union SNPVAC has accused Ryanair of "coercing" crew members in Portugal, Italy, Spain and Belgium by wanting to know who is going to participate in the strike that has been called for the end of the month.
The airline, which flies in 37 countries and carried 130 million passengers last year, averted widespread strikes before Christmas by deciding to recognize trade unions for the first time in its 32-year history.
Workers will hold the stoppage on July 25 and 26, while staff in Italy will hold industrial action for 24 hours on July 25.
In a statement, Ryanair said all customers affected have been contacted by text or email and any passenger who has not received a communication should expect their flight to operate as scheduled. You should not be charged anymore for this'.