Southwest Airlines plans to serve Baltimore, Denver, Houston Hobby and Phoenix with recently-acquired slots at Newark Liberty International airport.
The announcement of additional flights from Newark follows Southwest unveiling St. Louis as its initial destination from the airport in October.
US regulators earlier this year required that United and Continental relinquish 18 slots at Newark in order for the US Department of Justice to approve their merger, and Southwest reached a deal with the carriers to lease the slots.
Southwest in June plans to launch three daily nonstop flights to Baltimore and Denver, two to Houston and two to Phoenix.
Southwest will compete with United-Continental mainline in all those markets with the exception of Baltimore. According to Innovata Continental serves the Newark-Baltimore pairing through its regional partners Colgan and ExpressJet. While Continental does not serve Houston Hobby, it has a hub in Houston at George Bush Intercontinental airport.
Once all the service has started, Southwest will offer 18 daily nonstop flights from Newark.