Severoural'sk is a provincial town and has no airport. That is why to get to Moscow, you need to reach a larger city close to Severoural'sk first, from there you'll be able to fly.
It is impossible to buy direct flights Severoural'sk — Moscow, because the former does not have an airport. However, pretty close the following airports are to be found:
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Airports in Moscow
Hotels in Moscow
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