SpaceX's unmanned Dragon capsule is set to dock with the International Space Station on a mission to deliver food, scientific experiments and other cargo, NASA says.
"Dragon is scheduled to be captured Sunday at 6.01am EST (2301 AEDT) by NASA Expedition 34 Commander Kevin Ford and NASA Flight Engineer Tom Marshburn," the US space agency said in a statement.
NASA says Dragon will be installed onto the Earth-facing port of the ISS's Harmony module by ground experts at mission control in Houston and bolted into place via commands by the ISS crew.
The original plan was for Dragon to attach to the space station on Saturday and return to Earth on March 25, splashing down in the Pacific Ocean off the coast of Mexico's Baja California peninsula.
But the capsule had trouble with its thrusters shortly after launching on Friday from Cape Canaveral, Florida, causing the delay.
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SpaceX engineers found that only one of the spacecraft's four thruster pods, which help manoeuvre the capsule in orbit, was working. The problems were later fixed.
Dragon is carrying 544 kilograms of supplies on SpaceX's second resupply mission to the ISS.
This is the third commercial mission by SpaceX - Space Exploration Technologies - to the orbiting space station under contract with NASA.
NASA is relying on SpaceX and other commercial ventures to take over for its retired fleet of space shuttles, which last flew in July 2011.
SpaceX says it has 50 launches planned - both NASA missions and commercial flights - totalling about $US4 billion ($A3.94 billion) in contracts.
