The announcement marks the discount carrier's largest expansion in Denver since arriving two years ago. Southwest officials say even though Denver is only its 15th largest market, the Mile High City has been its fastest-growing market in the history of the company.
The new destinations are Philadelphia, Raleigh, N.C., Los Angeles, St. Louis, San Jose, Calif., and San Antonio.
Most of the new daily non-stop flights are scheduled to begin in May.
"We did promise you lower fares and more flights and I have to admit, this is well beyond my wildest imagination that we would be talking about this many flights today," said Gary Kelly, CEO of Southwest Airlines.
The new competition from Southwest could be good for all air travelers, by putting pressure on United and Frontier to match fares on those routes.
Frontier, which admits it is in a state of change right now, says it will place its focus on well-traveled regional routes, all the while emphasizing what got it going in the first place.
"This is our hometown," said Joe Hodas, a spokesman for Frontier Airlines, "We are the hometown airline. We are 100 percent sure we have the hearts and loyalty of our customers here."
The Southwest Airlines marketing team was out in full force on Wednesday, with all the rowdiness of a rock concert. They were out in downtown Denver giving away free round-trip tickets. They say 200 people received free round-trip vouchers on Wednesday.
Nationwide, Southwest is cutting some of its service, but say they are adding routes in places they feel have an unmet demand.
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