Irish passengers face disruption over the next few days after half of flights to and from France have been cancelled.
Doreen McKenzie from the Association of British Travel Agents said passengers should check before leaving home.
"The best thing to do is to contact whoever you have booked with to check the situation with your operator," she said.
"Most will want you to check in as normal, but contact them ahead of going to the airport."
This is the third national strike in a month by French unions opposed to the government's pension reforms.
Ministers want to raise the minimum retirement age from 60 to 62, and the state pension age from 65 to 67.
The civil aviation authority said up to half of flights to and from France have been cancelled because of walkouts.