Cheap flights from St. Louis to Florida Keys from CA $121

View CA $121 flight on Wed, Aug. 13, 2025Opens in a new window

Popular airlines from St. Louis to Florida Keys

  • Air Canada

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  • WestJet

    WestJet

  • Flair Airlines

    Flair Airlines

  • American Airlines

    American Airlines

  • United

    United

  • Delta

    Delta

  • Porter Airlines

    Porter Airlines

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Cheap flights from St. Louis (STL) to Florida Keys (MIA)

Prices were available within the past 7 days and start at CA $121 for one-way flights and CA $270 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Sep. 30 - Thu, Oct. 2
STL
St. Louis
MIA
Miami
CA $270 Roundtrip, found 3 days ago
CA $270
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Sep. 30 from St. Louis to Miami, returning Thu, Oct. 2, priced at CA $270 found 3 days ago
Delta
Sat, Sep. 13 - Fri, Sep. 26
STL
St. Louis
MIA
Miami
CA $293 Roundtrip, found 3 days ago
CA $293
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Sep. 13 from St. Louis to Miami, returning Fri, Sep. 26, priced at CA $293 found 3 days ago
Delta
Wed, Sep. 24 - Sun, Oct. 5
STL
St. Louis
MIA
Miami
CA $295 Roundtrip, found 3 days ago
CA $295
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Sep. 24 from St. Louis to Miami, returning Sun, Oct. 5, priced at CA $295 found 3 days ago
Delta
Sat, Sep. 27 - Tue, Oct. 7
STL
St. Louis
MIA
Miami
CA $308 Roundtrip, found 4 days ago
CA $308
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Sep. 27 from St. Louis to Miami, returning Tue, Oct. 7, priced at CA $308 found 4 days ago
American Airlines
Sat, Sep. 27 - Tue, Oct. 7
STL
St. Louis
MIA
Miami
CA $326 Roundtrip, found 4 days ago
CA $326
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Sep. 27 from St. Louis to Miami, returning Tue, Oct. 7, priced at CA $326 found 4 days ago
United
Sat, Sep. 27 - Tue, Oct. 7
STL
St. Louis
MIA
Miami
CA $352 Roundtrip, found 4 days ago
CA $352
Roundtrip
found 4 days ago
Select United flight, departing Sat, Sep. 27 from St. Louis to Miami, returning Tue, Oct. 7, priced at CA $352 found 4 days ago

Find the cheapest month to fly from St. Louis (STL) to Key West (EYW)

May is typically the cheapest month to fly

From CA $272 - CA $771 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.