In a quick burst of speed, up to 60 mph / 95 kmph. This would typically happen when said duck is trying to evade a predator (peregrine falcon or similar).
The eider duck has the distinction of being the fastest species (of all birds) reliably clocked on a long-distance flight, doing a steady 47 mph (75 kmph).
Most ducks are not fast flyers, though, and would be more likely to do something like a steady 20 mph / 32 kmph on a long-distance journey.
All of that is assuming travel in still air. With a tailwind, of course, ducks can hit much higher speeds. Or conversely, they can end up barely scraping along if they are fighting a stiff headwind. Ducks often change what altitude they fly at, trying to catch a tailwind or avoid the worst of a headwind.
The most common duck species in the world is the Mallard (the green-headed duck you see in every pond in the northern hemisphere). Their top speed is about 47 mph / 78 kmph, but their cruising speed is probably about half of that.
The eider duck has the distinction of being the fastest species (of all birds) reliably clocked on a long-distance flight, doing a steady 47 mph (75 kmph).
Most ducks are not fast flyers, though, and would be more likely to do something like a steady 20 mph / 32 kmph on a long-distance journey.
All of that is assuming travel in still air. With a tailwind, of course, ducks can hit much higher speeds. Or conversely, they can end up barely scraping along if they are fighting a stiff headwind. Ducks often change what altitude they fly at, trying to catch a tailwind or avoid the worst of a headwind.
The most common duck species in the world is the Mallard (the green-headed duck you see in every pond in the northern hemisphere). Their top speed is about 47 mph / 78 kmph, but their cruising speed is probably about half of that.