Still thinking of getting away for turkey day? How about really far away.
Virgin Atlantic Airways is currently running a pretty good deal on its site. My search for travel between a few major U.S. cities to London's Heathrow over the long holiday weekend came up with these low prices. All fares are economy class, round trip with taxes and fees included:

• New York (JFK): $430.50 (11/26-11/30)
  
• Newark: $544.51 (11/26-1201)
  
• Boston (Logan): $574.51 (11/26-12/02)
  
• Chicago (O'Hare): $594.51 (11/26-12/01)
  

Other departure cities include Orlando, Las Vegas and San Francisco to just name a few. You must book by December 3, 2008 for travel between November 18, 2008 and May 25, 2009. Check Virgin Atlantic for full details and restrictions.