Frontier Airlines, the no-frills carrier with cheap tickets and a pile of fees, is growing again.

The Denver-based airline on Wednesday announced 18 new nonstop routes and put seven previously announced routes out of Newark International Airport, which itbegan serving in November after Southwest Airlines' exit, on sale.

The new flights include Frontier's first service to El Salvador and Guatemala, and a big boost in flights out of Miami, ahub for American Airlines.Frontier has served Central America in the past, but with service to Costa Rica that has since ended.

The airline is also adding two new destinations in the Dominican Republic: Santo Domingo and Santiago.Frontier already serves Punta Cana and was supposed to add Newark-Punta Cana next spring, but tickets did not go on sale today along with other new Newark routes, and the airline provided no details on the flights.

Frontier regularly experiments with routes, introducing most on a seasonalbasis with flights a few times a week, and quickly pullsthem if bookings don't meet expectations.

Like fellow discounters Spirit and Allegiant, Frontier charges for carry-on bags and soft drinks on the plane, in addition to the typical airline charges for checked bags.

A Frontier Airlines jet at Denver International Airport. The airline is headquartered in Denver.(Photo: Frontier Airlines)

Miami International Airport to and from:

Baltimore/Washington International Airport to and from:

Newark, New Jersey to and from:

Ontario International Airport, Ontario, California, to and from:

San Juan, Puerto Rico, to and from:

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Frontier adding 18 nonstop routes, including new flights to Caribbean, El Salvador and Guatemala - USA TODAY