Frontier Airlines continues to expand its national route network, announcing four new nonstop flights to and from Miami International Airport.

Starting in mid-November, the low-cost airline will fly nonstop from Miami to Boston, Detroit, Bradley International Airport in Hartford, and San Juan, Puerto Rico.

The Hartford and San Juan flights will begin on November 14 and are scheduled for Tuesdays, Thursdays, and Sundays. The Boston and Detroit flights will commence on November 15 and operate on Mondays, Wednesdays, Fridays, and Saturdays. All of the flights are designated as seasonal service.

Previously, Frontier announced new nonstop routes from Miami to Las Vegas, beginning September 15, and Cleveland and Cincinnati, starting October 10.

The Las Vegas flights are daily; the others will fly four days a week (Mondays, Wednesdays, Fridays, Saturdays), although the flights to Cincinnati/Northern Kentucky International Airport will operate three days weekly between October 10 and November 14 (Tuesdays, Thursdays, and Sundays).

“We are proud to count Frontier among our busiest airlines since they began Miami service in 2014, and we look forward to welcoming their new service to four additional destinations, including Boston and Hartford/Springfield – two first-time routes by Frontier from MIA,” said Lester Sola, director and CEO of Miami International Airport.