Manager Bruce Bochy chose right-hander Ryan Vogelsong as his Game 2 starter for Monday.
The Giants waited out the ending of the wild-card Cardinals' thrilling comeback at Washington on their team plane in Cincinnati before heading home to the Bay Area.
Bumgarner, a 16-game winner this year, lost Game 2 of the NL Division Series at home to Cincinnati.
NL West champion San Francisco, back in the NLCS for the second time in three years, rallied from a 2-0 division series deficit to beat the Reds on Thursday night, then stayed put in Ohio to learn its opponent.
The complete projected rotations for the NLCS are as follows:
Giants: LH Madison Bumgarner (16-11, 3.37, 191 Ks), RH Ryan Vogelsong (14-9, 3.37 in 31 starts), RH Matt Cain (16-5, 2.79, 193 Ks, 219 1/3 IP, first perfect game in franchise history June 13 vs. Astros), RH Tim Lincecum (10-15, 5.18, 186 IP, 190 Ks, matched career high with 17 wild pitches) or LH Barry Zito (15-8, 4.15, 184 1/3 IP; won final 5 starts and 7 straight decisions).