Originally Posted by yyzgigi

By the rules of the fare no. $75 is the fee to change to earlier flights.

However, EWR is often impacted by traffic or weather delays so you may find a flexible agent that will let you do it, but certainly don't expect it.

If you want the earlier flight be prepared to pay.

Originally Posted by margarita girl

To clarify, free stand by is only offered in the Rapidair triangle, YYZ, YOW, YUL.