The phrase "arrive prematurely" is correct and usable in written English.
It can be used to describe someone or something that reaches a destination or conclusion earlier than expected or intended.
Example: "The guests began to arrive prematurely, causing the host to scramble to prepare for the event."
Alternatives: "arrive early" or "show up ahead of time."
After both of her children arrived prematurely, the main thing she wanted was a job that would allow her to be around for their younger years.
I was at the birth of all our four children, apart from my son Aaron who arrived prematurely while I was in America and I couldn't get back in time.
Willett's first child, a boy, arrived prematurely on the Tuesday before Masters week, with the uncertainty over that birth date meaning he wasn't certain even to play in the Masters for a time.
When Diane got pregnant at the age of 30, she was 'immersed in my career', while Fred already had two adult children and wasn't sure he could face doing it all again, so, into a highly hostile atmosphere, little Georgina arrived prematurely at 32 weeks.
The blackcap's song has led to it being described as the "mock nightingale" or "country nightingale", and John Clare, in "The March Nightingale" describes the listener as believing that the rarer species has arrived prematurely.
In the event of poor bolus control in people with dysphagia, the bolus arrives prematurely in the pharynx and the onset of the swallow can be significantly delayed (Power et al 2007).
The New York Times seemed to arrive at the premature consensus prematurely.
Deification may have come prematurely to Mr. Chang.
Croft, by stumps, which arrived seven overs prematurely due to bad light, surely regretted his decision to field.
Due in March, doctors gave the pair a slim chance of survival after arriving three months prematurely, with Simone weighing less than a kilo and her sister just three pounds.
