If you average those together it comes to 106.50 each way which is not too bad.
8/31 is the Friday of Labor Day weekend. That is why we are coming home on 8/30. We figure that 8/31 will be a heavy travel day.
Have you considered returning on 8/30... we got a 7:50 pm flight out of MCO that should arrive at JFK around 10pm for $99. If you are spending your whole trip a Disney this will give you until about 3-4pm at the park until you have to leave.