It will mark the first splashdown in 45 years for NASA astronauts and the first return in the gulf.

U.S. astronauts Bob Behnken and Doug Hurley, who launched to the space station in May, are expected to splash down at one of seven landing sites in the Gulf of Mexico or Atlantic Ocean at about 2:48 p.m. ET on Sunday.

This will be SpaceX's first splashdown with astronauts on board, ending a two-month test flight that began May 30 at NASA's Kennedy Space Center -- the first launch of a crew from the U.S. in nearly a decade.

Russia and a private U.S. company are looking for a deep-pocketed adventurer to set foot outside the International Space Station.

NASA astronauts Doug Hurley and Bob Behnken reported that the capsule was performing beautifully, as they closed in for the docking.

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“Awesome launch,” Joel Montalbano, NASA’s deputy space station program manager, said once the capsule reached orbit.

This marked the women's third spacewalk together.

Joshua Kudryk and Jenni Sidey-Gibbons, who both hail from Alberta, graduated Friday along with 11 Americans from NASA's basic astronaut training and will be part of the next generation of space explorers hoping to return to Earth's satellite and beyond.

"Congrats, Christina, on reaching new heights," NASA said.