3 astronauts flew on multiple Apollo missions
* Jim Lovell - Apollo 8, Apollo 13 (intended to land) * John Young - Apollo 10 (later landed on Apollo 16) * Eugene Cernan - Apollo 10 (later landed on Apollo 17) No astronaut has walked on the moon more than once.
Additionally 3 astronauts would have flew on multiple Apollo missions and possibly walked on the moon more than once had the program continued past Apollo 17
* Dick Gordon - Apollo 12 (had been slated to land on Apollo 18) * Fred Haise - Apollo 13 was scheduled for Apollo 19 * Stuart Roosa - Apollo 14 (he had also been slated to land on the moon with Apollo 20)
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Twelve astronauts have flown to the Moon as part of the Apollo program, but only four have been on more than one Apollo mission. They are Jim Lovell, John Young, Eugene Cernan, and Charles Duke.
A total of 71 astronauts flew into space on Apollo missions. These astronauts were divided across the 17 Apollo missions that included manned flights.
There were 24 astronauts who flew to the Moon as part of the Apollo program.
There have been a total of 11 Apollo missions that included astronauts going to space. This includes the Apollo 7 to Apollo 17 missions that took place between 1968 and 1972.
The Apollo missions had different crew sizes, with the majority of missions having a crew of three astronauts. However, the first two Apollo missions (Apollo 7 and Apollo 9) were crewed by three astronauts, while Apollo 8 and Apollo 10 had crews of four. Apollo 11, which famously landed on the moon, had a crew of three.
A total of 24 US astronauts have been to the Moon, and 12 have walked on its surface. There were a total of 27 astronauts on 9 Apollo lunar missions, but three of these went twice. (see related question)