The key to taking advantage of low-cost carriers like Frontier Airlines ... on the date and time of your flight. You would pay $60 to 66 for paying before check-in online; and $79 at the airport ...

Phoenix Sky Harbor is one of three airports to get Frontier Airlines' new flights to this Pacific Northwest city. Here's how ...

Frontier Airlines will add flights this summer from Phoenix Sky Harbor International Airport to Paine Field in Everett, Washington, about 30 miles north of Seattle. Phoenix is one of three ...