To achieve good soundproof, it really depends on your budget for replacing windows.
The price varies a lot.

Please look for laminated or double glazed windows glass.
This will perform better than typical windows but the price can be easily >200%.

The cheapest solution is to buy rubber strip to seal your current windows edge, no windows replacement.
Otherwise, please look for windows, glass or aluminium contractors (German window, Reliance Home, or etc).

I use German Windows soundproof windows because I lived near to mosque, recently their volume higher but when I closed the windows, it sounds so much better.

Their soundproof windows come with security features therefore I didn't put grills, looks nicer too.

You can contact them thru Facebook or thru their website.