Two pilots fell asleep at 37,000ft (11,000m), missing an airport runway before waking to safely land the plane, an aviation publication says.
Air traffic tried to contact them after they overshot the point of descent into Ethiopia’s Addis Ababa airport.
The pilots eventually woke up and landed the plane on its second approach, the Aviation Herald said.
The Ethiopian Airlines crew have been put on leave pending investigation, state-run news outlet Fana reported.
Monday’s passenger flight took off from Sudan’s Khartoum airport.
The Boeing 737, with a 154-seat capacity, normally takes less than two hours on its route between the neighbouring countries.