What is the cheapest airline that flies from Lambert-St Louis to Florida Keys?

Frontier, Southwest, and United Airlines are the most popular carriers operating from Lambert-St Louis to Florida Keys

What airlines fly to Florida Keys?

American Airlines, Delta and United Airlines are the top three most popular airlines that fly to Florida Keys from St. Louis according to our data. American Airlines is the first choice among our users, with 71% of people opting to fly with this airline when traveling to Florida Keys. Keep in mind that there are 3 different airlines that fly to Florida Keys on a routine basis, so you have a few additional options to choose from.

How many flights depart from St. Louis to Florida Keys on average per week?

As of March 2026, there are 56 flights per week flying from St. Louis to Florida Keys. The most common day of the week flights depart is Sat, with 20% of flights taking off on this day.

When did momondo last update prices for flights from Lambert-St Louis Airport to Florida Keys?

Prices for flights from Lambert-St Louis Airport to Florida Keys were last updated today.

How many operators does momondo search for flights from Lambert-St Louis Airport to Florida Keys?

As of March 2026, there are 7 operators available to choose from for flights from Lambert-St Louis Airport to Florida Keys.

How old do you have to be to fly from Lambert-St Louis Airport to Florida Keys?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Florida Keys.

What documentation or ID do you need to fly to Florida Keys?

The required travel and health documents for your Florida Keys trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Florida Keys. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$66 Cheap Flights from St. Louis to Florida Keys in 2026

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Find the cheapest flights from St. Louis to Florida Keys

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:12 pm - 10:36 pm

STL

EYW

7h 24m

1 stop

7:29 pm - 11:44 pm

EYW

STL

5h 15m

1 stop

$263American Airlines

Wed, May 20 - Wed, May 27

12:27 pm - 10:58 pm

STL

EYW

9h 31m

2 stops

6:45 am - 10:16 am

EYW

STL

4h 31m

1 stop

$268American Airlines

Tue, May 12 - Tue, May 19

8:16 pm - 1:06 pm

STL

MIA

15h 50m

2 stops

3:54 pm - 6:50 am

MIA

STL

15h 56m

1 stop

$279Multiple Airlines

Fri, Apr 10 - Sun, Apr 19

8:12 pm - 5:38 am

STL

MIA

8h 26m

1 stop

5:05 am - 10:30 am

MIA

STL

6h 25m

1 stop

$280Frontier

Sat, Mar 28 - Sun, Apr 5

11:25 am - 12:49 am

STL

MIA

12h 24m

1 stop

7:04 pm - 6:50 am

MIA

STL

12h 46m

1 stop

$281Frontier

Thu, Apr 16 - Tue, Apr 21

6:29 pm - 12:49 am

STL

MIA

5h 20m

1 stop

5:45 am - 11:58 pm

MIA

STL

19h 13m

2 stops

$282Frontier

Thu, Apr 9 - Fri, Apr 10

6:55 pm - 9:40 am

STL

MIA

13h 45m

1 stop

8:00 am - 7:23 pm

MIA

STL

12h 23m

2 stops

$285Multiple Airlines

Thu, May 7 - Mon, May 11

6:30 am - 2:51 pm

STL

EYW

7h 21m

1 stop

4:38 pm - 10:28 pm

EYW

STL

6h 50m

1 stop

$301United Airlines

Mon, Apr 13 - Tue, Apr 21

6:30 am - 4:42 pm

STL

EYW

9h 12m

2 stops

4:38 pm - 10:28 pm

EYW

STL

6h 50m

1 stop

$306United Airlines

Mon, Apr 13 - Tue, Apr 21

1:27 pm - 7:49 pm

STL

EYW

5h 22m

1 stop

6:19 pm - 11:59 pm

EYW

STL

6h 40m

1 stop

$316Delta

Wed, May 13 - Mon, May 18

Frontier flights from St. Louis to Florida Keys

Our best Frontier deals on St. Louis to Florida Keys flight tickets

Frontier

Apr 2

STL6:29 pmLambert-St Louis

5h 20m

1 stop

MIA12:49 amMiami

Apr 7

MIA5:05 amMiami

6h 25m

1 stop

STL10:30 amLambert-St Louis

$280

Frontier

Apr 16

STL11:25 amLambert-St Louis

12h 24m

1 stop

MIA12:49 amMiami

Apr 21

MIA7:04 pmMiami

12h 46m

1 stop

STL6:50 amLambert-St Louis

$281

Frontier

Apr 9

STL6:29 pmLambert-St Louis

5h 20m

1 stop

MIA12:49 amMiami

Apr 10

MIA5:45 amMiami

19h 13m

2 stops

STL11:58 pmLambert-St Louis

$282

Southwest flights from St. Louis to Florida Keys

Our best Southwest deals on St. Louis to Florida Keys flight tickets

Southwest

Apr 28

STL2:30 pmLambert-St Louis

5h 10m

1 stop

MIA8:40 pmMiami

Apr 29

MIA3:00 pmMiami

2h 55m

STL4:55 pmLambert-St Louis

$286

Southwest

Apr 28

STL10:25 amLambert-St Louis

9h 15m

2 stops

MIA8:40 pmMiami

Apr 29

MIA6:40 amMiami

5h 50m

1 stop

STL11:30 amLambert-St Louis

$301

Southwest

May 2

STL6:20 amLambert-St Louis

9h 40m

2 stops

MIA5:00 pmMiami

May 5

MIA5:45 pmMiami

5h 50m

1 stop

STL10:35 pmLambert-St Louis

$318

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Wed 5/20

2:12 pm-10:36 pm

1 stop7h 24m

Key West

Wed 5/27

7:29 pm-11:44 pm

1 stop5h 15m

$263

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Tue 5/12

12:27 pm-10:58 pm

2 stops9h 31m

Key West

Tue 5/19

6:45 am-10:16 am

1 stop4h 31m

$268

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Fri 4/10

8:16 pm-1:06 pm

2 stops15h 50m

Miami

Sun 4/19

3:54 pm-6:50 am

1 stop15h 56m

$279

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Sat 3/28

8:12 pm-5:38 am

1 stop8h 26m

Miami

Sun 4/5

5:05 am-10:30 am

1 stop6h 25m

$280

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Thu 4/16

11:25 am-12:49 am

1 stop12h 24m

Miami

Tue 4/21

7:04 pm-6:50 am

1 stop12h 46m

$281

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Thu 4/9

6:29 pm-12:49 am

1 stop5h 20m

Miami

Fri 4/10

5:45 am-11:58 pm

2 stops19h 13m

$282

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Thu 5/7

6:55 pm-9:40 am

1 stop13h 45m

Miami

Mon 5/11

8:00 am-7:23 pm

2 stops12h 23m

$285

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Mon 4/13

6:30 am-2:51 pm

1 stop7h 21m

Key West

Tue 4/21

4:38 pm-10:28 pm

1 stop6h 50m

$301

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Mon 4/13

6:30 am-4:42 pm

2 stops9h 12m

Key West

Tue 4/21

4:38 pm-10:28 pm

1 stop6h 50m

$306

Quickest round-trip

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Wed 5/13

1:27 pm-7:49 pm

1 stop5h 22m

Key West

Mon 5/18

6:19 pm-11:59 pm

1 stop6h 40m

$316

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Florida Keys

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Florida Keys?

The month of August is another great option to travel to Florida Keys, with average flight prices from St. Louis averaging around $336.

What is the cheapest day to depart on your flight to Florida Keys?

The cheapest day to depart from St. Louis to Florida Keys is on a Monday when prices can be found for as low as $501. The most expensive day to fly to Florida Keys is Tuesday, with ticket prices averaging around $587.

What is the cheapest time of day to depart on your flight to Florida Keys?

According to our data, the cheapest time of day to fly to Florida Keys is in the evening. momondo users have found flights departing from St. Louis to Florida Keys in the evening for as low as $394. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $549.

How far in advance should I book a flight to Florida Keys?

You are more likely to see cheaper flights to Florida Keys from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Florida Keys for around $396 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Florida Keys from St. Louis for as low as $323 on momondo.

Can stopping save me money on St. Louis to Florida Keys flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Florida Keys.

Cheap St. Louis to Florida Keys flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Florida Keys

Fastest flight time	2h 40m
Direct flights	Every day
Airports in Florida Keys	3 airports

The fastest flight from St. Louis to Florida Keys takes 2h 40m

Direct flights go from St. Louis to Florida Keys every day.

There are 3 airports in Florida Keys. From St. Louis there are direct flights to Miami (MIA).

Search flight deals

When did momondo last update prices for flights from Lambert-St Louis Airport to Florida Keys?
Prices for flights from Lambert-St Louis Airport to Florida Keys were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to Florida Keys?
As of March 2026, there are 7 operators available to choose from for flights from Lambert-St Louis Airport to Florida Keys.
How old do you have to be to fly from Lambert-St Louis Airport to Florida Keys?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Florida Keys.
What documentation or ID do you need to fly to Florida Keys?
The required travel and health documents for your Florida Keys trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Florida Keys. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from St. Louis to Florida Keys?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Florida Keys is Boeing 737 MAX 8, representing 26.06% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 19.62%, Embraer 175 at 6.23%, and Airbus A321-100/200 at 6.19%.

Best airlines flying from St. Louis to Florida Keys

Compare and see reviews for airlines that fly from St. Louis to Florida Keys with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $222	Free Cancellation	Rating 7.9 8,319 reviews	Search Delta flights
American Airlines	PriceFrom $222	Free Cancellation	Rating 7.1 11,489 reviews	Search American Airlines flights
United Airlines	PriceFrom $262	Free Cancellation	Rating 7.4 9,460 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Florida Keys?

Finding the right flight to Florida Keys from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Florida Keys quick and easy, saving you time and money.

Can I find flights from St. Louis to Florida Keys with flexible booking policies on momondo?

Flights from St. Louis to Florida Keys with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Florida Keys?

Once all potential St. Louis to Florida Keys flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Florida Keys right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Florida Keys flights. All you need is a valid email address and we will do the rest; it is that quick and easy.