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Find cheap flights from St. Louis to Florida Keys from $59

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Florida Keys departing on 6/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Wed 7/10
Wed 7/17

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Best Florida Keys Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Miami
Miami1 stop$118
Key West
Key West1 stop$198

Good to know

Low season

October

High season

March

Cheapest flight

$59
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from St. Louis to Miami

FAQs - booking Florida Keys flights

  • How does KAYAK find such low prices on flights from St. Louis to Florida Keys?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Florida Keys.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Florida Keys?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Florida Keys from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Florida Keys?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Florida Keys with an airline and back to St. Louis with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Florida Keys?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Florida Keys from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Florida Keys

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to the following destinations at these prices or less: Miami $196 one-way - $389 round-trip

Top 5 airlines serving from St. Louis to Florida Keys

Need help choosing which airline to fly with from St. Louis to Florida Keys? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10295 reviews
8.6Crew
8.0Entertainment
8.2Boarding
7.9Comfort
7.4Food
Airline reviews

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

2.0 MediocreNairan, May 2024JFK - FLL
Read more about Delta reviews

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

5-hour delay due to storms in Tanoa and airspace restricted by Miami traffic controllers.

I would fly again the whole experience was great. The only feed back I can give that they don't do that American Airlines does is the crew there is more humorous with boarding and thank their passengers. It makes it more fun to fly with them. I would however fly Delta again.

Horrible. This was not first class. This was a connecting flight whi h was late. My original flight never came. I hated the fact that delta gave me a connecting flight from New York to Orlando Florida. No meals and the television screens were not working. There wasn't even any power to charge your phones. This is NOT FIRST CLASS DELTA!!! Do better next time!

They did a fine job. Can't wait to use Delta in the future.

Seat back monitors and outlets were dead and not working.

The experience was good and the flight departed on time and landed early

The flight was delayed but we got to our final destination.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

Boarding super slow with people allowed to linger in aisles

It is a modern tragedy that any airline expects you to travel for 14 hours in such discomfort and that the only way to add comfort is exorbitant prices. I was in pain by the time we landed. Shameful.

Original plane sidelined. Had to wait an hour for replacement.

Crew was very cooperative and professional. Passenger's first checked in bag should be free.

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

Horrible, the flights kept delaying, so it is obvious that we won't be able to make it to the next connection. No easier/real agent on site to help you figure this out. UA agent on other counters refuse to assist you and direct us to use the QR code/call customer service. So inefficient and poor. While technology seems convenient, but it's not the best interest/experience for customers need help while there is active issue need assistance.

My window shade didn’t work. So I missed coming into my city. ☹️

There was a group of school age passengers that were very loud and unruly with their chaperones were no where to be found.

flight delays, staff only communicating when pushed, food service lasting a grand total of 7 minutes, stuck in seat from 45mins into flight until landing

I liked everything about the flight. The service was excellent!

Delayed a day due to snow storm. Was upgraded. That kind of made up for significant delays from FLL to COS with no compensation or acknowledgement.

Everything was fine once we actually got on our flight. It was more then annoying they canceled (delayed) our flight. We lost out on a day of our trip along with money on our stay. Plus we had to book another hotel. So expensive.

This flight was canceled and delayed several times without explanation. The plane was freezing cold and no wifi for messaging. Getting off the plane was terribly unorganized and felt like it took forever….

Use planes with TVs on flights over 4 hours. The free entertainment was a cheap in between solution for a very long flight that you don't even bother providing meals or decent snacks.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Flight was cancelled had to move to another gate late again no internet paid for the month and never can use it waste of money

Flight delayed over an over all day until it cancelled at 1:30am. Would not repeatedly delay that late. Offer hotel rooms and rebook early. Very difficult for families with small children

American Airlines continues to price it can provide the least comfortable passenger experience in the air. This legacy carrier rivals the budgets for both terrible seats and inadequate amenities. I am a 5’7” woman who is not wider than a coach seat (even on these narrow bodied aircraft). My 3.5 hour flight was terribly uncomfortable because the leg room is inadequate (my knees hit the seat on front of me even when it was not reclined); the seat barely reclines; and the foam padding is worn thin to the extent one can feel the metal supports of the seat. Add to this the fact that the aisle is super narrow, so that the drink cart literally scrapes the arm rest of the aisle seat. It’s basically torture.

It was a good flight. Of course it was full, but it went well.

We sat on the plane for 1 hour because the airline was short handed could not be unloading.

We are gluten free, there were not any available complimentary gluten free options.

Not enough help at airport during boarding process. Flight was delayed. Overall WORST flying experience I’ve ever had. Will NEVER FLT SPIRIT AGAIN

The non stop flight and able to go into Atlantic City airport. They could lower the prices. It starts out low but then if you want to bring luggage and pick your seat the price goes up quite a bit.

Flight expected to leave at 6:40 pm ended leaving at 8:00 am the following day. I slept in a cold airport. Never again Spirit for me…

My flight was cancelled!!! I had to spend 200.00 on another flight!!

Horrible. Delays, no customer support and fake promises and everything. i am suffering to help as due to connecting flight getting missed no support on ground and customer support window is closed and we are sitting o ground without anything

Terrible… missed our flight due to ridiculously long time to go thru baggage check-in!

Everything was really good but the seats are not very comfortable.

Spirit canceled the flight in March and never notified me!

Pretty good. Would’ve been excellent if we would have left on time and the crew wasn’t late.

Spirit airline tries to screw you at every opportunity. Spirit wanted 65$ for an extra pound in the suitcase Made me open the suitcase at the counter to remove 1 pound. Staff very cold and rude Will never fly spirit again and will recommend same to family and friends

It was delayed 9 hours for operational reasons, despite the plane arriving to the airport on time.

I am very disappointed with Frontier Airlines. They cancelled our flight because they couldn't find a crew member, and then didn't get us to our connecting flight. We had to cancel our whole vacation. We were promised flight and hotel vouchers, but they never sent them.

I fly Frontier because it’s affordable. I understand that the seats are tight and not the most comfortable…but that’s part of it. The problem with this flight was that there was a group of travelers directly behind me at the back of the plane who were ridiculously loud and obnoxious the entire flight. I’m pretty sure they were drunk and I could periodically smell an odd odor that I believe was one of them using a smokeless vape pen. The stewards had to remind them to keep quiet during the pre-flight instruction, but that was it. They never said another thing to them for the rest of the flight. It was a miserable.

Six hour delay. Poor customer service. No voucher. Bad communication. Missed important appointments.

I purchased a carry on bag online…was supposed to cost $72 but after a whole slew of bs charges, the total was over $175.00. Because of these hidden charges, I will not even consider flying Frontier ever again. It’s just not worth the hassle. I’m scratching this company off my list forever.

Flight delayed 3 times, resulting in late arrival, rental car place gave car away resulting in increased BS charges because I was late. Frontier blows.

It was impossible to change a carry-on for a checked bag after the initial selection. The flight was delayed 14 hours "to allow for a late arriving aircraft." The seats were shockingly uncomfortable. This was only the second time I've seen seats that didn't recline in an airline. The first was in an East Bloc airline before the fall if the Iron Curtain.

First time flying Frontier, I am not sure the Ala Carte menu of options is for me.

I liked getting off the plane. Everything else was well below standards. Not even offering a bag of peanuts for free for a 4 hours flight is ridiculous.

There was no wifi, there was no usb charger on the planes Frontier lowered the weight limit on suitcases from 50 to 40 pounds Frontier now charges for a seat...really? If i don't pay for a basic seat, do i stand the whole flight? Frontier now charges for the carry on, just like for the checked suitcase The bundle pricing is way over priced.

Book cheap flights from St. Louis to Florida Keys

Recent round-trip flight deals

6/20Thu
1 stopFrontier
13h 21mSTL-MIA
6/22Sat
1 stopFrontier
10h 03mMIA-STL
$118
8/12Mon
1 stopFrontier
8h 59mSTL-MIA
8/16Fri
1 stopFrontier
9h 06mMIA-STL
$140
9/10Tue
1 stopAmerican Airlines
6h 37mSTL-EYW
9/17Tue
1 stopAmerican Airlines
6h 15mEYW-STL
$198
8/3Sat
nonstopAmerican Airlines
2h 51mSTL-MIA
8/8Thu
nonstopAmerican Airlines
3h 04mMIA-STL
$199
9/15Sun
2 stopsSpirit Airlines
25h 04mSTL-MIA
9/23Mon
2 stopsSpirit Airlines
16h 18mMIA-STL
$212
7/16Tue
1 stopDelta
6h 35mSTL-EYW
7/16Tue
1 stopDelta
6h 36mEYW-STL
$216
7/5Fri
1 stopDelta
8h 45mSTL-MIA
7/10Wed
1 stopDelta
5h 38mMIA-STL
$218
7/9Tue
1 stopSpirit Airlines
25h 48mSTL-MIA
7/10Wed
2 stopsSpirit Airlines
27h 19mMIA-STL
$223
11/12Tue
1 stopUnited Airlines
5h 51mSTL-MIA
11/19Tue
2 stopsUnited Airlines
7h 43mMIA-STL
$343
7/9Tue
1 stopUnited Airlines
7h 19mSTL-MIA
7/10Wed
2 stopsUnited Airlines
9h 13mMIA-STL
$353

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Recent one-way flight deals

6/18Tue
1 stopFrontier
8h 13mSTL-MIA
$59
6/17Mon
1 stopFrontier
8h 47mSTL-MIA
$65
6/18Tue
3 stopsSpirit Airlines
33h 49mSTL-MIA
$85
6/18Tue
2 stopsSpirit Airlines
21h 55mSTL-MIA
$93
8/3Sat
nonstopAmerican Airlines
2h 51mSTL-MIA
$95
7/3Wed
1 stopDelta
6h 35mSTL-MIA
$104
10/7Mon
1 stopDelta
6h 52mSTL-MIA
$114
7/3Wed
nonstopAmerican Airlines
2h 50mSTL-MIA
$180
11/13Wed
2 stopsUnited Airlines
13h 13mSTL-MIA
$203
6/22Sat
2 stopsUnited Airlines
22h 20mSTL-EYW
$415

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Last minute flights from St. Louis to Florida Keys

Last minute flight, train and bus deals

6/11Tue
multi-stopFrontier
13h 06mSTL-MIA
6/27Thu
multi-stopFrontier
19h 23mMIA-STL
$198
6/14Fri
multi-stopFrontier
9h 02mSTL-MIA
6/15Sat
multi-stopFrontier
10h 03mMIA-STL
$234
6/14Fri
multi-stopAmerican Airlines
5h 51mSTL-EYW
6/18Tue
multi-stopAmerican Airlines
7h 05mEYW-STL
$345
6/14Fri
multi-stopAmerican Airlines
7h 17mSTL-EYW
6/18Tue
multi-stopAmerican Airlines
8h 47mEYW-STL
$350
6/12Wed
multi-stopDelta
8h 16mSTL-MIA
6/15Sat
multi-stopDelta
6h 31mMIA-STL
$606
6/11Tue
multi-stopUnited Airlines
5h 58mSTL-MIA
6/12Wed
multi-stopUnited Airlines
11h 42mMIA-STL
$611
6/11Tue
multi-stopUnited Airlines
11h 10mSTL-MIA
6/27Thu
multi-stopUnited Airlines
8h 48mMIA-STL
$622
6/14Fri
multi-stopSpirit Airlines
20h 00mSTL-MIA
6/15Sat
multi-stopSpirit Airlines
20h 36mMIA-STL
$925
6/11Tue
multi-stopDelta
6h 54mSTL-MIA
6/27Thu
multi-stopDelta
7h 21mMIA-STL
$1,025
6/11Tue
multi-stopSpirit Airlines
26h 31mSTL-MIA
6/12Wed
multi-stopSpirit Airlines
26h 44mMIA-STL
$1,027

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St. Louis - Florida Keys Flights

Departure:

St. Louis (STL)United States

Cabin classes:

$522
$231
$388
$39