United has special deals for flights to Europe. Fares are valid if you book till December 27, 2007.
Baltimore - Athens, Greece $336
Boston - Madrid, Spain $248
Charlotte - Prague, Czech Republic $340
Chicago - Rome, Italy $336
Denver - Zurich, Switzerland $319
Indianapolis - Milan, Italy $348
Las Vegas - Munich, Germany $230
Los Angeles - Frankfurt, Germany $228
Miami - Budapest, Hungary $282
New Orleans - Amsterdam, Netherlands $280
New York City - Dublin, Ireland $221
Orlando - Brussels, Belgium $270
Philadelphia - Zurich, Switzerland $316
Phoenix - Istanbul, Turkey $342
Portland, OR - Rome, Italy $336
San Diego - Madrid, Spain $317
San Francisco - Paris, France $356
Seattle - Warsaw, Poland $363
St. Louis - Paris, France $254
Washington-Dulles - Brussels, Belgium $366