The electrical conductivity of perovskite-related oxides CaTi _l-xAl_xO_3δ and SrTi_l-xAl _xO_3δ (x = 0-0.4) were investigated within the temperature range 900 to 1000 °C and the oxygen partial pressure range between 10-²⁰ and 0.21 arm using a dc four-point technique. The materials investigated show predominantly p-type electronic conductivity at high, n-type electronic conductivity at low, and ionic conductivity at intermediate oxygen partial pressures. The values of ionic conductivity in CaTi_l-xAl_xO_3δ were found to be lower than those in CaTi_l-xFe_xO_3δ. The effect of aluminium concentration on the high-temperature transport properties was examined.