It will go through extensive testing before going live at the end of the first quarter of 2017, when Hughes introduces its HughesNet Gen5 high-speed satellite Internet service in the U.S.
"ULA is honored to have been entrusted with the launch of the EchoStar XIX satellite", said Gary Wentz, ULA vice president of Human and Commercial Systems.
The satellite is created to help the HughesNet Gen5 system deliver more data and other features to consumers and small businesses that have limited or no access to terrestrial broadband internet services.
Sunday's liftoff is planned for 1:27 p.m. EST (1827 GMT).
The launch was the seventh Atlas V to blast off from Cape Canaveral this year.
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Because of the added solids, the soar to space should be spectacular for locals and tourists gathering from around the world to view the launch now slated for just a day away.
EchoStar 19 will be delivered to a geosynchronous transfer orbit (GTO) atop the United Launch Alliance Atlas V booster. "As we move into our second decade, we will maintain our ongoing focus on mission success, one launch at a time even as we transform the space industry, making space more accessible, affordable and commercialized".
It will be stationed at 97.1 degrees West longitude.
The Atlas V rocket (designated AV-071) will be carrying the EchoStar 19/Jupiter 2 communications satellite.
It is upgraded from the prior series version. The mission was launched aboard an Atlas 5 431 configuration vehicle, which includes a 4-meter Extra Extended Payload Fairing (XEPF) and three solid rocket boosters.