How many people have completed space travel by entering Earth orbit?

The number of people who have completed space travel by entering Earth orbit is approximately 555. This figure accounts for all astronauts and cosmonauts who have gone into orbit since the inception of space travel, beginning with Yuri Gagarin in 1961 through to recent times as of October 2023.

The number counts not only those who have flown to the International Space Station or other missions launched by various space agencies but also includes individuals who have participated in various orbital missions outside of NASA, such as those from Russia, Europe, and private space ventures.

This number is constantly changing as more missions are undertaken and more individuals go into space. It reflects a milestone in human space exploration, highlighting the advancements in technology and international cooperation in accessing and studying space.