I am currently on a LONE4, and when I booked my ticket, I had a direct flight from SYD-HNL. The routing has now changed because I believe the carrier who originally flew this route no longer does, so the flight goes via LAX.

I want to know that if I wanted to change the date of this flight (that now goes SYD-LAX-HNL) will I be able to do so without incurring any extra charges?

Thanks.