Budget US carrier Southwest Airlines has announced to additional routes to and from Atlanta’s Hartsfield Jackson International Airport.

The news comes just after an announcement that the carrier would begin service to and from Atlanta for the first time in February of next year. Now included in the new Atlanta schedule will be nonstop flights to Phoenix and Las Vegas, beginning on 10 March, the low-cost enterprise announced today.

In the initial announcement carrier officials said that Southwest would operate flights between Atlanta and Denver, Houston (Hobby), Chicago (Midway), Austin, and Baltimore/Washington. Atlanta is currently the largest city in the United States that isn’t served by Southwest Airlines.

Executive VP of planning and strategy for Southwest, Bob Jordan, said that such a quick expansion into Atlanta signified the airline’s solid commitment to the new market. He said that Southwest was proud to show off its updated route map in which Atlanta is connected to some 50 other Southwest destinations.

Along with the expansion plans the carrier has announced a fare sale; seats on flights between Atlanta and Phoenix or Las Vegas begin at $109 (£68) before taxes and fees. The sale runs through 1 October for travel between 10 March and 7 April, 2012.