Mar 19, 2025
NASA Astronauts Who Have Spent the Longest Time in Space
NASA astronauts have set incredible records in space, advancing human space exploration. Here are some top record-holders:
Peggy Whitson holds the record for the most cumulative days spent in space by a NASA astronaut, with 675 days across multiple missions
Sunita Williams has spent 608 days in space, with her current mission extended by 287 days due to technical issues
Jeff Williams set a US record for cumulative time in orbit, spending 534 days in space across four missions
Mark Vande Hei has spent 523 days in space over two missions, with his longest being a 355-day stay aboard the ISS from April 2021 to March 2022
Scott Kelly logged 520 days in space across four missions, holding the US record for cumulative time in orbit until Jeff Williams surpassed it
As of March 18, 2025, Butch Wilmore has spent approximately 462 days in space across three missions
NASA astronaut Michael Barratt has logged 447 days in space across multiple missions, including the recent SpaceX Crew-8 mission
Shane Kimbrough spent 388 days in space across three missions and retired after 22 years of service
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