"The International Space Station can be seen as a small object in upper left of this image of the moon in the early evening Jan. 4 in the skies over the Houston area flying at an altitude of 390.8 kilometers (242.8 miles). The space station can occasionally be seen in the night sky with the naked eye and a pair of field binoculars."
Source: NASA
so it looks like they can go from the space station to the moon quicky.
Damn, am I a speed reader or what?...only took 10sec to read a news article