The 2019 Buick Cascada is available as a 2-door, 4-seat convertible. Starting at $33,070, the 2019 Buick Cascada Base is powered by a 1.6L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway. The top of the line 2019BuickCascadaSport Touring , priced at $ 37,070 , is powered by a 1.6L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway.