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The microwave spectra of trans-1, 2-difluoroethylene oxide was investigated in the region of 26.5 to 40 GHz. A fit of the near-prolate $\mu b$-type spectrum gave the following rotational constants (MHz) for the ground state normal isotope: $A=14731.47,B=3582.85$ and $C=3222.44$. The electric dipole moment was measured to be $\mu b=\mu T=1.110$. The dideutero species, CDFCDFO, and the oxygen-18 species, CHFCHF180, have been assigned and presently work is in progress on the carbon-13 isotopic assignment. The isotopic data will be used to discuss the molecular structure.