The phrase "a windfall to a" is correct and usable in written English.
It can be used to describe an unexpected gain or advantage that benefits someone or something.
Example: "Winning the lottery was a windfall to a struggling family, allowing them to pay off their debts."
Alternatives: "a boon to a" or "a blessing for a".
Extracting it domestically, with tougher safety rules, would bring a windfall to a Treasury that sorely needs one.
In court papers, the city quoted from a 1981 Supreme Court ruling that "punitive damages imposed on a municipality are in effect a windfall to a fully compensated plaintiff" and would probably lead to "an increase in taxes or a reduction in public services for citizens footing the bill".
The development of this cellular wireless technology which divided every population region into dozens of small "cells" to greatly increase the number of available mobile telephone channels provided a windfall to a number of companies fortunate enough to get into the fray early on.
But that undoubtedly looks like a windfall to a group that only a few months ago sent a letter to management demanding that the company "cease cash waste and restructure immediately" for fear that Covad would run itself into the ground and bondholders would be left in the cold.
While peace deprived gun makers of government money for a time, it delivered a windfall to well capitalized dealers.
Yet it will provide a windfall to just a handful of advisers — including the boutique investment banks on LinkedIn's side.
If companies merely reshuffle the use of cash without changing behavior, then the tax holiday amounts to a windfall to shareholders, not an effective economic stimulus.
They thought this country deep-dyed conservative enough to stomach a windfall to the rich and a kicking to those with least.
The Prudential Insurance Company of America, the nation's largest life insurer, dangled the prospect of a windfall to its policyholders under a plan announced yesterday to set up a new corporate structure.
Oil prices, at the highest level in nearly a decade, have brought a windfall to Russian oil companies and helped give the Sibneft shareholders the resources to acquire the smelters.
