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.

Frontier Airlines will launch two new nonstop routes from Austin in May, the airline announced Tuesday. Flights to Miami and Philadelphia are set to begin May 22. Each route will be served three times per week.