Flights in and out of Brussels Airport were suspended on Tuesday due to a strike by air traffic controllers.
An airport spokesman said that some 50 flights had already been cancelled due to the closure of air space from midday. Air traffic controllers said late on Monday that they planned a 24-hour action.
Aer Lingus said it has had to cancel two flights between Dublin and Brussells. The carrier said in a statement: “Customers who have been affected by a cancellation will be informed via SMS message and email.
“Aer Lingus has activated a change for free and refund request facility on aerlingus.com.”