Mortality rates are difficult to quantify due to reporting limitations and the evolving pandemic, but WHO has determined that COVID mortality rates are higher than those associated with seasonal flu. Current estimates of the number of deaths divided by the number of reported cases, known as crude mortality, are in the 3-4% range. This is exponentially more devastating than the 0.1% approximate mortality rate of seasonal flu.
In simpler terms, 30 or 40 people will die out of every 1,000 who contract COVID, while only one person dies out of every 1,000 who acquire flu.
The actual mortality rate will likely prove lower than 3-4% as reporting improves and more cases are discovered, but the threat of dying from COVID certainly appears to be incomparable to flu. Even the lowest credible estimate of 0.6%, out of Columbia University, predicts COVID is six times deadlier than flu.