Thanks for all the input guys. Yeah, work commitments won't permit me to take a flight in time from where I'll be to Baltimore on time (even on a non-DL flight), so that's out. Looks like I might just can the trip and put the $200 towards a completely new routing (which is significantly cheaper than just going ATL-UIO and back).

Thanks for all the thoughts. I was just wondering if anyone had any success getting out of a flight for free/cheaper than what I was quoted. Didn't think I'd see any luck but was worth asking.