The tall, white rocket roared into the blue sky over Cape Canaveral, Florida at 3:34 pm (1934 GMT), propelling Koreasat-5A toward a geostationary orbit some 22,000 miles (36,000 kilometres) from Earth.
The satellite is designed to replace an earlier version, called Koreasat 5, which launched in 2006. The satellite was successfully deployed, SpaceX confirmed about 45 minutes after launch.
Minutes after launch, the rocket separated and the tall portion, called the first stage, fired its engines and manoeuvred its grid fins to guide itself back to an upright landing on an ocean platform.
"A little toasty but the Stage 1 is certainly still intact on the droneship," said a SpaceX commentator, as video images showed the rocket standing upright on the platform.
Monday's launch marked the 16th for SpaceX so far this year.
Headed by space enthusiast and solar energy entrepreneur Elon Musk, SpaceX is working on re-using rocket parts after launch -- rather than jettisoning them into the ocean as is the typical practice.
So far, the company has managed to land 12 rockets on ocean platforms and seven on solid ground.
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