The Aer Lingus EI3622 departed George Best Belfast City Airport at 7.05am on Sunday.
It was scheduled to land at Glasgow Airport but data from online plane tracker FlightRadar24 shows the flight do a loop above Wishaw before heading for the capital.
The reason for the diversion has not been confirmed, but reports suggest the foggy weather made the runway at Glasgow too difficult for crew to see.
AGS Airports has been contacted for comment.
