Frontier Airlines plans in May to add several new routes to Puerto Rico as part of an expansion that will see the airline launch its first flights to the US territory’s city of Ponce.

The Denver-based ultra-low-cost airline says the moves will leave it with more routes to Puerto Rico than any carrier.

On 4 May, Frontier will begin flying to San Juan four-times weekly from Cleveland, daily from Baltimore and Dallas-Fort Worth, and six-times weekly from Chicago-Midway, the airline says on 31 January. On 5 May it will launch four-times-weekly flights to San Juan from Detroit.

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Source: Frontier Airlines

Also on 4 May, Frontier will begin three-times-weekly flights from Tampa to Aguadilla on Puerto Rico’s west coast. That same day it add the southern Puerto Rican city of Ponce to its network, with a three-times-weekly flight from Orlando.

Then on 25 May the airline plans to begin flying between Cancun and San Juan.

Frontier currently flies to San Juan from 10 cities, including Atlanta, Hartford, Jacksonville, Miami, Orlando, Philadelphia, Punta Cana, Raleigh-Durham, Santo Domingo and Tampa, Cirium data shows. It also now flies between Aguadilla and Orlando.

Frontier will compete on the new routes with American Airlines, Delta Air Lines, JetBlue Airways, Spirit Airlines, Southwest Airlines

The expansion comes as Frontier is offering a flat rate for unlimited flights between its US and international destinations with a new summer subscription package. The so-called GoWild! All-You-Can-Fly Summer Pass ($399) applies to travel 2 May through 30 September 2023.