Is there a site that shows the on time/delay percentages of each airline compared to each other, Airport by airport?

I have the impression that LGA->ORD in the afternoons has an atrociously high avg delay and a very high cancellation rate. This is anecdotal, but I have been doing this trip almost weekly since the beginning of the year, so I'd like to think I have some experience. Maybe data can help me decide if I'm with the best airline (if another is performing better!)