We're in Orlando right now, and flew Air Tran out of Flint, MI. Flint's a little over 2 hrs from London (we cross the border at the Bluewater Bridge in Sarnia). Direct, non-stop flights (all of Air Tran's other flights go through Atlanta) with great times. Total cost for the four of us was US$860, although if you were patient I saw them as low at $650 after we'd booked. Flint's airport is very small compared to DTW or YYZ (8 gates, I think) and extremely easy to navigate. On-site economy parking is US$25/week and there's a no-frills Econo Lodge right across the street.
We will definitely look at this option again for our next trip.
- Mike