NASA astronaut Suni Williams retires after 608 days in space and nine spacewalks.

Suni Williams retired from NASA after a 27-year career, having logged 608 days in space and completed nine spacewalks totaling 62 hours and 6 minutes.

Suni Williams retired from NASA after 27 years of service, effective Dec. 27, 2025. She completed three missions aboard the International Space Station and logged 608 days in space across her career. Williams carried out nine spacewalks totaling 62 hours and 6 minutes, and she was the first person to run a marathon in space. Her recent service included a Boeing Starliner test flight in June 2024 and a return to Earth in March 2025 on a SpaceX Crew-9 mission. Notable records and missions: - Retirement effective Dec. 27, 2025, after a 27-year NASA career. - Logged 608 days in space, reported as second among NASA astronauts for cumulative time off Earth. - Recorded a 286-day single flight, tied with another astronaut for sixth-longest single U.S. flight. - Completed nine spacewalks totaling 62 hours and 6 minutes, the most spacewalk time by a woman and fourth-highest overall. - Reported as the first person to run a marathon while in space. - First launched on STS-116 in December 2006; Expedition 32/33 in 2012 (served as station commander during Expedition 33); flew on Boeing's Starliner in June 2024 and returned on SpaceX Crew-9 in March 2025. Summary: Her retirement closes a long career marked by multiple records and leadership roles that the article reports supported station operations and commercial crew testing. Undetermined at this time.