Solid solutions Ba1-xPrxFe1-yCoyO3-δ (x = 0.3, y = 0.1–0.6 and x = 0.1–0.6, y = 0.2) with cubic structure were synthesized through a glycerol-nitrate technique. The oxygen content, thermal expansion, electrical conductivity and the Seebeck coefficient in the Ba1-xPrxFe1-yCoyO3-δ oxides were measured versus temperature in air. The oxygen content increases with increasing iron and praseodymium concentrations in Ba1-xPrxFe1-yCoyO3-δ. The value of the thermal expansion coefficient weakly depends on the composition of solid solutions. The conductivity of Ba1-xPrxFe1-yCoyO3-δ is practically independent of the concentration of 3d metals and increases significantly with increasing praseodymium content. The maximum conductivity value of 210 S/cm is obtained for Ba0.4Pr0.6Fe0.8Co0.2O3-δ at 450 °C in air. A positive value of the Seebeck coefficient indicates the predominant p-type conductivity in Ba1-xPrxFe1-yCoyO3-δ.