Air France has a holiday sale going on right now (who doesn't) where you can save some cash with many flights to Europe. Here is a sampling of the fares I found on their website. In parenthesis are the competition's price.
*Tue Jan 13 - Tue Jan 20: Washington (IAD) - Frankfurt (FRA), $529, 1 stop (AA $503, 1 stop)
*Thu Jan 15 - Thu Jan 22: Boston (BOS) - Paris (CDG), $664 (Iberia $603, 2 stops)
*Sat Feb 21 - Sat Feb 28: Chicago (ORD) - Warsaw (WAW), $671, 1 stop (SWISS $743, 1 stop)
*Tue Mar 10 - Tue Mar 17: Los Angeles (LAX) - Paris (CDG), $649, nonstop (Delta $883, nonstop)
Many other U.S. and European cities are included in this sale. You must book by December 29, 2008 and travel between January 12, 2009 and March 25, 2009. For full terms and conditions check out Air France.