"of arrivals" is correct and usable in written English.
You can use it as part of a noun phrase, typically to refer to the arrival of something, for example: "The airport was bustling with the sounds of arrivals."
The frequency of arrivals hasn't let up, with about 25 boats arriving daily at unpredictable times, including early morning hours.
Yet the flow of arrivals shows no sign of slowing.
The flow of arrivals trickled slowly to a halt.
The majority of arrivals are from Afghanistan, Iran and Sri Lanka.
Last year, according to the UNHCR, 31% of arrivals were Syrians, and 18% were fleeing Eritrea.
But for many European countries the surge of arrivals in the 1990s came as a shock.
There was no sign of a surge of arrivals by air either.
Dozens of arrivals were delayed or late, the airport reported on its Web site.
Greece has seen a significant increase in the number of arrivals in comparison to last year.
The Dublin Regulation ensured that frontline states bore the brunt of arrivals.
