Preferably, You'll want to let three-5h of transit time in Johannesburg, so that you've sufficient time to catch your connecting flight. Transiting in Johannesburg is quite easy; only follow the indications for ‘Intercontinental Transit’. The flight from Johannesburg to Harare will take about 1h 30m. *Fares displayed are collected throughout https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/