The 1.5-metre long weapon was detonated in the Thames estuary off Sheburyness, Essex.
The 500 kg (1,102 pound) bomb was found in the George V Dock in North Woolwich during construction work at the London City airport early on Sunday.
The 500kg bomb, which also led to a part suspension of the DLR and evacuations of local homes as police warned people to avoid the area, was detonated in the waters off Shoeburyness at midday today.
Royal Navy bomb disposal experts have detonated a large wartime device that was recently discovered in the River Thames.
Metropolitan Police and Royal Navy diver teams examined the device, following which an exclusion zone was declared, and local residents evacuated, overseen by the London Borough of Newham.
The detonation, which took take place off Shoeburyness, Essex, was postponed on Tuesday because of high winds and unsafe conditions for divers.
"Royal Navy bomb disposal experts are called out roughly every 18 hours to incidents such as this and we are well trained and well placed to deal with them", he added.
"I would like to offer my honest thanks to the Royal Navy and in particular, the team of expert divers under the command of Lieutenant Commander Sean Heaton for their professionalism and tireless efforts over a prolonged period to bring this operation to a safe conclusion". It is likely that the bomb may have been dropped by German aircraft attacking what was once a London industrial center that stood where the airport is now located.
Royal Navy bomb disposal experts return after detonating the device.