Birmingham Airport said it had to temporarily suspend services on Sunday due to “an air traffic control fault”.
The incident comes the same week as the Gatwick Airport fiasco, which saw roughly 140,000 passengers affected when a drone was apparently spotted around the runway, forcing bosses to ground flights across three days.
A Birmingham Airport spokesman said: “We are working to resolve the issue as soon as possible.
“Passengers are advised to check with their airline regarding flight departures and arrivals.
“We apologise for the inconvenience this is causing to our passengers.”
Flights were affected from around 6pm.
The spokesman said IT technicians were working on the problem and hoped it was “not too serious”.