There is, two in fact, but I would consider putney and richmond bridges flat.
Even the one in Barnes where Marc Bolan died isn't exactly hilly.
Very very flat easy route. I like it.
Of course, of an evening, I have diverted home via Richmond park for some grimping with panniers full of laptop and toolkit.
Edited to add my second thoughts - Richmond bridge does have a hill on the way into town. But the surface is good so it feels less hill like.