flight 1247 why it is delay

Check with the airlines. Unless someone is at the airport and can see the boards and know why a flight is delayed, there is no way yo tell.

Snow in Colorado

So true as above

Because.

If it's headed West, snow is the answer. I think Denver International has been mostly closed with cancelled and delayed flights all day... Can't control mother nature...

You can check for the reason of your delay with the airline or websites like flightaware.