8 Astronauts Who Spent Longest In Space
Peggy Whiston
The American astronaut spent 675 days across multiple missions, making her the most experienced spacewoman in terms of cumulative days.
Jeff Williams
Another NASA astronaut who spent the most time in space, Jeff left Earth for 534 days across four missions, setting a US record for cumulative time in orbit.
Mark Vande Hei
Mark has accumulated 523 days in space over two missions. His most notable stay was a 355-day mission from April 2021 to March 2022.
Butch Wimore
As of March 18, 2025, Wilmore has accumulated 462 days in space across three different missions.
Shane Kimbrough
Yet another NASA astronaut to spend the most days in space, Shane went on three missions and spent a total of 388 days in space. He retired after 22 years.
Scott Kelly
A retired NASA astronaut, Scott logged 520 days in space across four different missions.
Michael Barratt
The NASA spaceman has spent a total of 447 days in space across multiple missions, including the recent SpaceX Crew-8.
Sunita Williams
As of today, Sunita Williams has spent approximately 608 days in space across three missions. She returned to Earth after nine months on March 18, 2025.