MIAMI — Frontier will launch a small expansion in St. Louis this June. Beginning June 13, Frontier will add nonstop service from St. Louis to both San Francisco and Trenton, New Jersey, and on June 15, Frontier will start service between St. Louis and Portland, Oregon.

When Frontier launches these new routes, it will serve 10 destinations nonstop from St. Louis. It currently flies to six markets in Mexico and the Caribbean as part of a partnership with Apple Vacations. Frontier currently operate nonstop flights between St. Louis and Denver.

Frontier will fly the new flights three times a week on each of the new routes.

St. Louis’ airport director, Rhonda Hamm-Niebruegge, applauded the new Frontier routes, and the airport believes they are filling key gaps in the airport’s service offerings.

“Frontier’s expansion of flights from St. Louis really addresses two top targets of service for this airport with a new nonstop destination to Portland, Oregon, and additional service to San Francisco,” Hamm-Niebruegge says in a statement. “Trenton is also a new nonstop market and we believe it will be very attractive for both business and leisure travelers who want more price-conscious options to reach numerous destinations between New York City and Philadelphia.”

Frontier’s new service comes five years after American Airlines dehubbed St. Louis which was inherited through its merger with TWA. After American dehubbed St. Louis, several airlines have filled some of the capacity that was dropped by American.

Although it is not known if St. Louis will become a hub for another airline again, Southwest has developed a large operation in St. Louis that has grown to nearly three dozen destinations nonstop.