Passengers hit by the French air traffic control strike, which ended at midnight, are trying to get to their destinations as flights return to normal.
Airlines are running normal schedules but some passengers are having to make long diversions in order to get home.
Passengers are being advised to check with their airline before travelling to the airport.
After two days of disruption, the planned six-day strike was called off following talks between unions and the French government.
Around 8,000 Irish airline passengers were left stranded over the two days due to the dispute.
Ryanair said it is covering accommodation and food bills for those affected but there are no guarantees for those who choose to reroute.
A Belgian air traffic control strike may cause some delays later today.
Meanwhile, Ryanair has confirmed that some of its cabin crew were not paid for the hours they spent waiting at airports for delayed flights.
Some Ryanair cabin crew are employed through an agency and they are paid only the time they are in the air.
Therefore they are not paid when the plane is on the ground and that includes if it is delayed.
Other cabin crew are employed directly by Ryanair and are paid an annual salary.