Low-cost carriers Southwest Airlines and Frontier Airlines are adding flights and starting new destinations from Denver International Airport, in Denver, Colorado, the United States, in 2010.

Southwest Airlines, the low-cost carrier based in Dallas, Texas, the United States, has announced that it will launch daily, non-stop flights from Denver International Airport (in Denver, Colorado), to Boston (Massachusetts), Reno (Nevada), and Spokane (Washington) in January 2010.

Pet Airways has announced that it will launch the first ever pet-only airline service, serving five cities to start with, New York, Washington D.C., Chicago, Denver and Los Angeles.

AirTran Airways has said that it woluld launch seasonal flights between Denver and Milwaukee from 21 May 21, 2009. The flights would be between Denver International Airport and General Mitchell International Airport, Milwaukee. One round-trip flight between the two cities is planned through 8 September, 2009.

Southwest Airlines Company, the low-cost airline based in Dallas, Texas, the United States, has announced that is planning to drop 31 flights but add 40 others, including a big push into Denver.

Southwest Airlines, the low-cost airline based in Dallas, Texas, the United States, is expanding yet again in Denver in a big way by adding 5 non-stop departures and three new cities.