MIAMI — Frontier Airlines announced yesterday its first service to San Juan, Puerto Rico from both Orlando and Philadelphia.

“Our network continues to expand in markets where people want to fly,” said Josh Flyr, Frontier Vice President, Network Planning. “And customers in Philadelphia, with the addition of San Juan, Puerto Rico, now have a low-cost option to 20 destinations.”

The daily non-stop service on Airbus A321s will start on June 11, and is scheduled to operate year-round, except for two months in the fall, after Labor Day until mid November.

“The flight will be back in mid-November, and then will operate continuously up until Labor Day of next year, so it’s a brief seasonal hiatus when demand falls off,” Flyr said.

Frontier will compete with American Airlines, which currently serves San Juan from Philadelphia.

“Philadelphia is a great success story for Frontier Airlines,” said Flyr. Philadelphia will be the fourth-largest airport station in the Frontier network this summer after Denver, Orlando, and Las Vegas, he said.

Once the new routes begin flying, the airline will boast 18 non-stop destinations from Philadelphia and another 25 destinations from Orlando.

While Frontier Airlines is adding service to Puerto Rico, it was recently announced that the low-cost carrier would stop flying to Cuba on June 4.