I've consulted six different summary sites (ncov2019.live, woldometers, Johns Hopkins, WHO, Google, and the BBC). There is variation but all agree the current death rate worldwide from COVID-19 is about 5.8%.
We all understand that both cases and deaths are being undercounted. I suspect that cases are more undercounted but that's just a guess.
For now, COVID-19 is killing a tad under 6% of confirmed cases.
Between flu season 2009 and 2018 (for convenience, I label a flu season which runs from year X to year X+1 as year X, so 2009 is the 2009/2010 season), there were about 315 million symptomatic cases of flu in the US and about 350000 deaths for a death rate of about 0.11%.
During that period the most mild flu season (2009) was 0.02% and the most severe (2010) was 0.17%.
In round figures, COVID-19 is observably about 50 times more lethal than the flu on a per case basis.
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