More Irish flights are delayed or cancelled due to the strike by French air traffic controllers, state media reported Wednesday.
Ireland's state broadcaster RTE said 26 Ryanair flights into or out of Ireland have been cancelled, including flights to and from Dublin, Cork and Shannon cities to destinations including France, Spain and Portugal.
Hundreds of Irish passengers were left stranded after their flights were grounded on Tuesday, the first day of the six-day strike.
RTE added Irish passengers are facing a second day of severe disruption to flights, with French Air Traffic Control forecasting slot delays will be "materially worse" on Wednesday.
Ryanair, the Irish low-cost airline, said it has been forced to cancel nearly 250 flights and has been requested by French authorities to cancel up to a fifth of its journeys for Wednesday to ease the pressure on French air traffic services.
A spokesperson for Ryanair said that 3,000 to 4,000 of the airline's Irish passengers were affected by Tuesday's disruption.
The same number of Irish passengers are likely be affected on Wednesday. Passengers booked on flights with other airlines can expect long delays.
Meanwhile, Ireland's national airline Aer Lingus said passengers travelling to France, Spain, Portugal and the Canary Islands experienced delays of up to four hours on Tuesday.
The airlines says that flights to Belgium, Netherlands and Luxembourg are also likely to be delayed on Wednesday.
French air traffic controllers are on strike to protest planned cuts that they say would harm air traffic control services in the country.