There are 2 members of ESA’s 2022 astronaut reserve class who have flown in space: Marcus Wandt and Sławosz Uznański. ESA’s reserve page says these are the two reserve astronauts from the class who were assigned missions, with Marcus already having completed his flight and Sławosz preparing for a mission in 2025.

Quick Scoop

ESA selected 17 astronauts in its 2022 class, and 12 of them joined the reserve group rather than the career astronaut track.

From that reserve group, only two have reached space so far: Marcus Wandt and Sławosz Uznański.

Who they are

  • Marcus Wandt — a reserve astronaut who already completed his space mission.
  • Sławosz Uznański — another reserve astronaut who was assigned a mission and was preparing to fly.

Context

ESA’s 2022 class included five career astronauts and 12 reserve astronauts.

That means the reserve group is the pool to watch for future flights, but as of the latest ESA information, only those two had flown.

TL;DR: 2 reserve astronauts from ESA’s 2022 class have flown in space so far.