Frontier Airlines is plotting a big network shake-up that's set to take effect right before the peak 2025 summer travel season gets into full swing. The Denver-based ultra-low-cost carrier will add more than a dozen new routes in May at airports across the country — including a new route to the northwest tip of Puerto Rico.

CLEVELAND, Ohio – Frontier Airlines is adding two new routes, to Boston and Nashville, to its growing list of destinations from Cleveland Hopkins International Airport. The new flights to Boston Logan International Airport will launch May 22 and run three times per week, on Sundays, Tuesdays and Thursdays.