Originally Posted by
Ottermatic
There is not, unfortunately. There used to be a shuttle between T1 and T3 when UA was running some regional planes out of the old CO side of T1, but that went away a couple of months ago (I discovered this the hard way and had a brisk walk over to T1 after having gone to T3 for lunch).
If you have PreCheck, though, then you should be able to re-clear security at T1 fairly quickly, and the walk between T2 and T1 isn't terribly long (maybe 5ish minutes?).
-OM
Sorry to bump this - but just to clarify, is there no airside access (walking or otherwise) between T2 and T1 then? I have my first ever US flight out of SFO coming up and would like to be able to use the AC in T2 while waiting if possible.