Sim does not show up in travel menu

@snoochyboots 

Need a little more information.  Where are you trying to travel from?  Home lot or is it a case of trying to get back home with all the active sims that traveled with you earlier?

If you are off the home lot, a lot of the time, NPCs and playable sims won't be available to travel, even if you can see them.  Most of the time, it's because they have already been queued to leave by the game.  There are other reasons too but that's the most common I find.

Another reason may also be if the sim you want to select is a vampire without the sun resistance perk and it is daylight.

Hope this helps.

The sim does not show up no matter where they are. In this screenshot they are at their home lot. As you can see in the photo, these 2 sims are clearly in the same household. *The other sim in the household does not show up no matter what filter you use, I just selected the household filter to make it easier to see.*

@snoochyboots  I've seen something similar to what you are describing. In my experience this can happen when the sim you want to travel with is still physically on the lot but in fact has decided they want to leave, just hasn't stated that they are leaving yet. I've found that re-engaging the sim with "Ask to hang out" or "Invite to stay the night" will have them stay, and they will again become available in the travel selection pop-up.