Cheap flights from St. Louis to Florida Keys from CA $102

View CA $102 flight on Thu, Aug. 14, 2025Opens in a new window

Popular airlines from St. Louis to Florida Keys

  • Air Canada

    Air Canada

  • 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 $102 for one-way flights and CA $394 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Dec. 24 - Wed, Dec. 31
STL
St. Louis
MIA
Miami
CA $394 Roundtrip, found 19 hours ago
CA $394
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Wed, Dec. 24 from St. Louis to Miami, returning Wed, Dec. 31, priced at CA $394 found 19 hours ago
American Airlines
Wed, Dec. 24 - Wed, Dec. 31
STL
St. Louis
MIA
Miami
CA $407 Roundtrip, found 19 hours ago
CA $407
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Wed, Dec. 24 from St. Louis to Miami, returning Wed, Dec. 31, priced at CA $407 found 19 hours ago
American Airlines
Wed, Dec. 24 - Wed, Dec. 31
STL
St. Louis
MIA
Miami
CA $409 Roundtrip, found 19 hours ago
CA $409
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Wed, Dec. 24 from St. Louis to Miami, returning Wed, Dec. 31, priced at CA $409 found 19 hours ago
American Airlines
Wed, Dec. 24 - Wed, Dec. 31
STL
St. Louis
MIA
Miami
CA $411 Roundtrip, found 19 hours ago
CA $411
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Wed, Dec. 24 from St. Louis to Miami, returning Wed, Dec. 31, priced at CA $411 found 19 hours ago
American Airlines
Wed, Dec. 24 - Wed, Dec. 31
STL
St. Louis
MIA
Miami
CA $422 Roundtrip, found 19 hours ago
CA $422
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Wed, Dec. 24 from St. Louis to Miami, returning Wed, Dec. 31, priced at CA $422 found 19 hours ago
Delta
Wed, Dec. 24 - Wed, Dec. 31
STL
St. Louis
MIA
Miami
CA $437 Roundtrip, found 19 hours ago
CA $437
Roundtrip
found 19 hours ago
Select Delta flight, departing Wed, Dec. 24 from St. Louis to Miami, returning Wed, Dec. 31, priced at CA $437 found 19 hours 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 $271 - CA $768 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.