The 2019 Buick Regal Sportback is available as a 4-door, 5-seat hatchback. Starting at $25,070, the 2019 Buick Regal Sportback Base FWD is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 32-mpg on the highway. The top of the line 2019BuickRegal SportbackGS AWD , priced at $ 39,070 , is powered by a 3.6L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.