Have you ever imagined what it’s like to live in space for months or even years? For some astronauts, space isn’t just a place they visit—it’s almost a second home. Over the years, a handful of brave explorers have spent more time in orbit than anyone else in history. Let’s take a closer look at the top seven astronauts who have clocked the most days in space as of 2025.
Oleg Kononenko (Russia) – 1,111 Days
Oleg Kononenko currently holds the world record for the most days spent in space. Over five separate missions, he has racked up an incredible 1,111 days away from Earth. In 2024, he became the first astronaut to cross the 1,100-day mark, setting a new standard for long-term space travel. His time aboard the International Space Station (ISS) has provided scientists with valuable information about how the human body handles extended periods in microgravity.
Gennady Padalka (Russia) – 878 Days
Before Kononenko took the top spot, Gennady Padalka was the record-holder. With five missions under his belt, Padalka has spent a total of 878 days in orbit. He is known for his calm leadership and expertise, especially during his time on the ISS.
Yuri Malenchenko (Russia) – 827 Days
Yuri Malenchenko is another highly experienced cosmonaut, having completed six missions and accumulated 827 days in space. He’s worked on both the Russian Mir space station and the ISS, making him one of the most seasoned astronauts ever.
Sergei Krikalev (Russia) – 803 Days
Sergei Krikalev is famous not just for his 803 days in space, but also for being in orbit during a historic moment—the collapse of the Soviet Union. Over six missions, he’s contributed to both Mir and the ISS, playing a key role in the evolution of international spaceflight.
Aleksandr Kaleri (Russia) – 769 Days
With five missions to his name, Aleksandr Kaleri has spent 769 days among the stars. He’s taken part in many important repairs and experiments, helping to keep the Mir and ISS running smoothly.
Sergei Avdeev (Russia) – 748 Days
Sergei Avdeev’s three missions add up to 748 days in space. Much of his time was spent on the Mir space station, where he worked on scientific studies and station maintenance.
Anton Shkaplerov (Russia) – 709 Days
Anton Shkaplerov has completed four missions, totaling 709 days in space. As a commander on the ISS, he’s led crews and participated in several spacewalks to upgrade and repair the station.
What About American Astronauts?
While Russians dominate the top of the list, Peggy Whitson stands out as the most experienced American, with 676 days in space. Sunita Williams is another well-known NASA astronaut, having spent over 608 days in orbit.
Why Does This Matter?
Spending long periods in space teaches us a lot about how the human body reacts to microgravity and isolation. The lessons learned from these record-setting astronauts are helping us prepare for future missions to the Moon, Mars, and beyond.
These seven astronauts have shown extraordinary dedication and courage. Their journeys have pushed the boundaries of human endurance and brought us closer to exploring the farthest reaches of our solar system.
