Home Misspellings How to spell heptathalon? Heptathalon or heptathlon? Which one is correct? by hersey December 5, 2018 Reading Time: 0min, 7sc + - 0 Heptathalon or heptathlon Which one is correct? You can find the answer below. Incorrect Heptathalon Correct Heptathlon You can find more information about Heptathlon word here. Rate this post Correct spelling of HeptathalonHow do you spell Heptathalon