If Possible, you'll want to let three-5h of transit time in Johannesburg, so that you've got sufficient time to capture your connecting flight. Transiting in Johannesburg is quite straightforward; just Stick to the indications for ‘Worldwide Transit’. The flight from Johannesburg to Harare requires about 1h 30m. KAYAK is really https://www.theluxurybooking.co.uk/flights-to-zimbabwe-from-london/