NASA Astronauts Who Spent Most Time In Space
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18 March 2025
NASA astronauts have achieved remarkable durations in space, contributing significantly to human space exploration. Here are some of the record-holders:
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1. Peggy Whitson has accumulated a total of 675 days in space across multiple missions, making her the most experienced NASA astronaut in terms of cumulative days
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2. As of today, NASA astronaut Sunita Williams has spent approximately 608 days in space across three missions
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Her current mission, which began on June 5, 2024 was initially planned as a short test flight but extended due to technical issues, adding over 287 days
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3. Jeff Williams, a NASA astronaut, spent a total of 534 days in space across four missions, setting a US record for cumulative time in orbit
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4. Mark Vande Hei has accumulated 523 days in space over two missions. His most notable stay was a 355-day mission aboard the ISS from April 2021 to March 2022
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5. Scott Kelly, a retired NASA astronaut, logged 520 days in space across four missions, holding the US record for cumulative time in orbit until it was surpassed by Jeff Williams
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6. As of March 18, 2025, Butch Wilmore, a NASA astronaut, has accumulated approximately 462 days in space across three missions
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7. NASA astronaut Michael Barratt has logged a total of 447 days in space across multiple missions, including the recent SpaceX Crew-8 mission
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8. NASA Astronaut Shane Kimbrough spent a total of 388 days in space across three missions, retiring after 22 years of service, including 18 years as an astronaut
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