The short answer
Yes — pear is a safe, juicy treat for budgies, as long as you remove the seeds.
Why
Pear is soft, sweet and hydrating, and most budgies enjoy it. Like apple, pear seeds contain compounds that release cyanide, so the pips must always be removed.
How to feed it
Wash it, cut a thin slice, and take out the core and every seed. The skin is fine to leave on.
How much & how often
A small piece 2–3 times a week; it's sugary, so keep it a treat.