$86 Cheap Frontier Airlines flights St. Louis (STL) to Miami (MIA)

Use the “Price (lowest to highest)” filter on Expedia to search for cheap Frontier Airlines return flights from $168 from STL to MIA. Affordable one-way options from $86 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

September is one of the least expensive months to get away to Miami with Frontier Airlines. You could also find fantastic deals on one-way and return tickets in October.

Begin your search one to three months before your departure to get cheap fares on Frontier Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Miami Intl. Airport (MIA). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Select our “Nonstop” filter when looking for direct Frontier Airlines flights from STL to MIA. It’s also an easy way to compare other carriers servicing the same direct trip.

Browse Frontier Airlines’s earliest flights from STL to MIA by selecting our “Morning” and “Early Morning” filters. Not only will you get to where you’re going sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Jump on a Frontier Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Miami, and you’ll probably touch down at Miami Intl. Airport (MIA). This is the airline’s main hub in this city.

A rewarding loyalty program and the chance to rack up points through Frontier Miles are the start of the reasons to travel from STL to MIA with Frontier Airlines. Plus, when you sign up to our One Key™ program, you can receive OneKeyCash™* in addition to Frontier Airlines’s loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

It’s generally possible to cancel or reschedule your flight, although there may be additional fees if you booked over 24 hours ago. Prefer to keep your options open? Apply the “No cancel fee” and “Changes included” filters to find flights that won’t penalize you if you need to revise your plans. To update your itinerary, visit “Trips,” select your flight and click on “Manage Booking” for more details.