Clark had heard more than enough about the Justice League. A team of heroes, determined to protect the planet. It sounded a lot like something that he'd gladly take part in, so Clark found himself scheduling ahead of time to meet up with the League after he heard news of everyone finally gathering for some sort of meeting. Despite him planning ahead, Clark really couldn't help it if he was delayed because of unwanted activity within the city.
So Superman arrive a little later than he would have preferred. He landed on the roof, took the stairs down to the top floor, and stepped into the area that Diana had set up for them all to gather.
"Sorry I'm late," he started, arms folding over his chest as he took a few steps into the room and fell to a halt. "Ran into a little trouble on the way."