Low-cost king Southwest is offering a robust list of more than 2,800 routes on sale for winter travel, but competition heats us from all sides as AirTran, American, Delta, Northwest, and US Airways also offer low fares.

Source: SmarterTravel.com: Travel Deals

Travel from Southern Florida to many destinations in the Caribbean and Latin America with American’s sale. Fly to Costa Rica, Curacao, Guatemala, or St. Thomas, among others, through early February. Book tickets by January 11.

Source: SmarterTravel.com: Travel Deals

This winter, thaw out on a Honolulu or Maui beach while gazing at the serene sunset. We compared Hawaiian’s sale fares with the competition’s prices and found Alaska, American, Delta, and Northwest consistently offer significant savings.

Source: SmarterTravel.com: Travel Deals

JetBlue has posted 20 routes to featured destinations including Orlando, New York, Kingston, and Nassau for travel through March. Half of the sale fares are solid. American, Continental, Delta, and United are just a few of the competing carriers.

Source: SmarterTravel.com: Travel Deals

Virgin America is offering excellent fares for travel to Boston, Ft. Lauderdale, Las Vegas, Los Angeles, San Francisco, and Washington, D.C. AirTran is the only airline competing. Book by December 29 for travel through February 2010.

Source: SmarterTravel.com: Travel Deals

Travel to Barcelona, Milan, Zurich, Paris, London, or Frankfurt starting at $510 round-trip. American’s sale fares are valid on flights departing from Boston or Washington, D.C. If you’re interested in this sale, look into connecting fares from your city.

Source: SmarterTravel.com: Travel Deals

Qantas’ New Zealand sale features flights to Auckland from several departure cities including Los Angeles, New York, Seattle, and Washington, D.C. Book tickets by Wednesday, January 6 for travel from May through June 2010.

Source: SmarterTravel.com: Travel Deals

Qantas’ new Australia sale features flights to Brisbane, Melbourne, and Sydney from both coasts and cities in between. Book tickets by Wednesday, January 6, for travel during the destination’s winter.

Source: SmarterTravel.com: Travel Deals

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Source: Best Adventures Latest Specials