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In page Olympic Games:

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The Oxford Olympics Study 2016 found that, since 1960, sports-related costs for the Summer Games were on average US$5.2 billion and for the Winter Games $3.1 billion. These figures do not include wider infrastructure costs like roads, urban rail, and airports, which often cost as much as or more than the sports-related costs.[citation needed] The most expensive Summer Games were Beijing 2008 at US$40‍–‍44 billion,[1] and the most expensive Winter Games were Sochi 2014 at US$51 billion.[2][3] As of 2016, costs per athlete were, on average, US$599,000 for the Summer Games and $1.3 million for the Winter Games; for London 2012, the cost per athlete was $1.4 million, and the figure was $7.9 million for Sochi 2014.[3]