Define blowout. Does this qualify: Green Bay 35, Kansas City 10? or this Los Angeles Raiders 38, Washington 9?I would say the biggest blow out in super bowl history...
Or do you mean
Chicago 46-New England 10
Dallas 52-Buffalo 17
San Francisco 55-Denver 10
Seattle 43-Denver 8?
There have been quite a few lopsided scores in SB history. 3 of the last 5 had double digit margins.
Quick glance through the final score list appears that over 1/4 had more than 2 score margins.