Do you have a distance or time range that tells you to fly versus drive? I have to go to Pittsburgh next month for a short stay (24 hours). It's a 5 hour drive, 1.5 hour flight. But with getting to the airport early, etc., it will take me about 1.5 hours more to drive than to fly...so I guess I'll fly (also because I want to get out of there as soon as I can).
What's your limit on driving to your destination?