You can throw Supes around all you like, if he smashes into anything, it pretty much only hurts the thing he smashes into lol.
I don't think even Flashes most powerful punches could injure the Man of Steel - maybe knock him really far, but doubtful whether they'd hurt him.
But I doubt Superman could catch the Flash to hurt him either.
In a strightline in outerspace, maybe Supes could get close to Flashes speed. But on a planet, in a fight? Supes is outmaneuvered.
I'll call it a draw.
i already saw flash fighting against a guy that was almost as fast as him and as tough as superman , and wally was being busted like a dog , and than he just ran faster and faster till he could catch this guy back , than he punched his face saying : He may be as tough as super but with the speed that i acquired ... he will feel it .
But i dont think he could win , all i am saying is that he could hurt super , but never win