Good morning, flying EWR->ATL->ORD on Sunday (2x the miles of LGA->ORD) and my flight gets in a little later than I would like so i'm thinking about an SDC.

Do I have to fly EWR->ATL->ORD or can I change to a different route? Do i have to fly out of Newark and into O'Hare or would LGA/JFK/MDW be possibilities?

Would love to either fly out of LGA since its much closer to home or find a way to do JFK->SLC->ORD