1. Check your fare conditions to make certain that the $200 is correct.

2. The likely result is $200 + fare difference. If the fare stays the same, that is $200. If the fare for your new travel goes up, you will be $200 +. If the new fare is less, you will be $200 - (which blunts the blow).

The impact on your wallet is the $200, not the value of the ticket, unless you never travel again.