Cheap flights across the U.S. from United

United offers low fares sale across the U.S. from $37.

Purchase by March 16, then fly by May 20.

Sample destinations, each-way fares:

• Austin - Chicago     $131
• Boston - Washington Dulles     $98
• Buffalo - Denver     $97
• Cedar Rapids - Los Angeles     $152
• Chicago - Minneapolis/St. Paul     $42
• Chicago - Pittsburgh     $47
• Chicago - Dallas/Ft. Worth     $112
• Dayton - Denver     $88
• Denver - Miami     $98
• Denver - Greensboro     $107
• Hayden/Steamboat Springs - Washington Dulles     $69
• Las Vegas - Los Angeles     $47
• Los Angeles - Monterey     $37
• Los Angeles - San Diego     $44
• Los Angeles - San Francisco     $47
• Los Angeles - Miami     $134
• New York City - San Francisco     $115
• Raleigh - Washington Dulles     $89
• San Francisco - Orange County     $39
• St. Louis - Washington Dulles     $116