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Avoid this fareAdvanced itinerary

STL to MIA

$171 is not your real price. Frontier basic economy.

STL7:20 PM
4h 50m · 1 stop · ATL
MIA1:10 AM
Basic economy Bag not included Late arrival
Sep 16–20 · 4 nightsVerified Jul 15, 2026 · 9:02 AM CT
Why this is cheaper

The savings have a source.

01

The advertised price excludes the bag and seat needs in your profile.

02

After required add-ons it costs more than the protected recommendation.

03

The overnight arrival adds schedule friction without real savings.

True trip cost

Every dollar we could identify.

Arithmetic checked
Advertised fare & taxes
$171
Carry-on
$74
Checked bag
$66
Seat selection
$20
True trip totalPer traveler · protection excluded
$331
Risk-adjusted trip cost$346
Trip-risk advisor

What could go wrong—and who protects you.

01

Basic-economy restrictions reduce change flexibility.

02

The late connection has greater operational fragility.

03

FareSift ranks this lower even though its headline fare is the smallest.

Carrier protection applies.
Nonrefundable and nonchangeable basic fare.

Ticket map

One protected ticket from start to finish.

F9STL ATL

F9 882 · 7:20 PM–9:58 PM · 1h 38m

F9ATL MIA

F9 611 · 11:32 PM–1:10 AM · 1h 38m