Unclogging a kitchen sink costs between $150 and $500 on average, with most customers spending approximately $300 to unclog a kitchen drain with an electric snake. At the cheap end of the range, a snake can clear small blockages in any kitchen drain that isn't the main line for only $100. On the high end, emergency calls to the plumber during non-business hours for serious blockages in the main pipe line can cost up to $1,350.