A national walkout by both French air traffic controllers and airport staff is expected to cause flight cancellations and delays tomorrow (Thursday).
Passengers are being urged to check the status of their flights before travelling due to the general strike.
British Airways warned: “Unfortunately in addition to cancelling some flights to and from France, other short-haul flights may also experience some disruption, given how many flights would normally use French airspace.
“There may also be some disruption on roads and public transport to/from airports if the strike goes ahead, so customers should allow extra time for their journeys.”
The airline said it would publish a revised timetable this afternoon for flights on Thursday “once we have the final details from the French authorities as to which flights can still operate”.
EasyJet said: “We have been advised of a possible public services as well as air traffic controllers strike in France on Thursday. Like all airlines, our flights to and from French airports, as well as those flying in French airspace, might be affected.
“We are doing everything possible to minimise the impact of the strike on our customers, and will communicate to affected customers directly via SMS on the details provided at the time of booking.
“We advise all passengers to allow plenty of extra time to get to the airport and consider alternative transport options where possible, as public transport services might be affected by the strike.
Rail and sea travel could also be hit due to protests by seven unions staging the latest industrial action over plans to reform labour laws in France.
Dock workers have been called out on 24-hour strike tomorrow while train drivers have called for action every Wednesday and Thursday until further notice.
Fresh demonstrations against the reforms are spreading across France, with lorry drivers barricading roads in Nantes, Marseille and Le Mans.