How long does it take Mallards before they fly?
They start flying at about 12 weeks but are not accomplished until about 16 weeks. Other breeds of ducks have been domesticated for so long and bred for beauty or egg production that they have lost the ability to fly unless you train them to fly.
Will the ducks fly away? The only breed we have that flies is the Mallard and they might fly away. Of course they may stay, too.
But to ensure they stay, see the answer to the next question.