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Key Largo

$61+ Cheap flights from St. Louis (STL) to Key Largo, FL

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MIA
Dec 30 — Jan 61
Mon 12/30
Mon 1/6
1 adult, Economy
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The best prices from Lambert-St Louis to Key Largo are usually found in September or August, booked 81 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from St. Louis to Key Largo

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Key Largo (KE9). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 25, 2024.

Round-trip from

$332
(United Airlines)

One-way from

$61
(Mytrip)

Popular in

March

Cheapest in

September

Average price

$440
From Lambert-St Louis to Key Largo
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One-way flight from Lambert-St Louis to Key Largo
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High demand for flights, 6% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in December 2024
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Find flight deals from St. Louis to Key Largo

Cheapest flights from St. Louis to Key Largo
Explore the most affordable flight options available from St. Louis to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 25, 2024.

This United Airlines deal was found by Cheapflights users on 12/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/315:00 amSTL - MIA
1 stop5h 46mUnited Airlines
Tue 1/76:15 amMIA - STL
2 stops10h 23mUnited Airlines
Deal found 12/24$332
This American Airlines deal was found by Cheapflights users on 12/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:00 amSTL - MIA
Nonstop3h 01mAmerican Airlines
Tue 1/72:09 pmMIA - STL
Nonstop2h 59mAmerican Airlines
Deal found 12/24$362
This Gotogate deal was found by Cheapflights users on 12/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/276:49 pmSTL - MIA
1 stop9h 11mFrontier
Sun 1/126:14 pmMIA - STL
1 stop15h 52mFrontier
Deal found 12/24$390
This Southwest deal was found by Cheapflights users on 12/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:50 amSTL - MIA
2 stops8h 00mSouthwest
Tue 1/73:50 pmMIA - STL
1 stop4h 35mSouthwest
Deal found 12/23$408
This Mytrip deal was found by Cheapflights users on 12/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3112:15 pmSTL - MIA
3 stops19h 35mMultiple Airlines
Tue 1/76:19 amMIA - STL
3 stops30h 26mMultiple Airlines
Deal found 12/24$518
This Delta deal was found by Cheapflights users on 12/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/315:17 pmSTL - MIA
1 stop6h 05mDelta
Sat 1/47:00 amMIA - STL
1 stop6h 09mDelta
Deal found 12/24$625

Find flights from St. Louis to Key Largo within your budget

Customize your flight search to find flights from St. Louis to Key Largo that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 25, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Fri 2/21

5:15 pm-3:55 pm

2 stops21h 40m

Miami

Fri 2/28

7:20 pm-11:30 am

3 stops41h 10m

$334

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Fri 1/31

2:15 pm-10:27 pm

1 stop7h 12m

Miami

Mon 2/3

8:00 pm-10:28 pm

Nonstop3h 28m

$335

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Sat 1/25

8:00 am-8:22 pm

2 stops11h 22m

Miami

Fri 1/31

9:00 am-2:14 pm

1 stop6h 14m

$339

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Sat 1/18

4:25 pm-8:10 pm

Nonstop2h 45m

Miami

Tue 1/21

8:25 am-3:50 pm

1 stop8h 25m

$343

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Mon 3/24

6:38 pm-11:33 pm

2 stops27h 55m

Miami

Thu 3/27

4:20 pm-5:45 pm

2 stops26h 25m

$428

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Sat 3/1

3:21 pm-6:47 pm

2 stops26h 26m

Miami

Sat 3/8

7:52 pm-10:59 pm

2 stops28h 07m

$443

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Fri 4/18

7:10 pm-12:54 am

1 stop4h 44m

Miami

Sun 4/20

8:05 am-1:19 pm

1 stop6h 14m

$492

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Mon 1/27

7:09 pm-11:22 pm

1 stop27h 13m

$61

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Tue 4/15

6:45 am-4:03 pm

1 stop8h 18m

$100

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Wed 4/16

5:55 pm-9:35 pm

Nonstop2h 40m

$111

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/24

Showing 1-10 of 14 results
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Best time to book a flight from St. Louis to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from St. Louis to Key Largo

Get recent, data-driven insights about flights from St. Louis to Key Largo including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from St. Louis to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Key Largo. Price data was last updated on December 20, 2024.

To ensure you get the cheapest price possible for a flight from St. Louis to Key Largo, you should look to book at least 81 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from St. Louis to Key Largo?

Currently, September is the cheapest month in which you can book a flight from St. Louis to Key Largo (average of $230). Flying from St. Louis to Key Largo in March is currently the most expensive (average of $289). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to KE9?

Find hourly flight availability from St. Louis to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 25, 2024.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Key Largo as you normally would.

What is the cheapest day to fly from St. Louis to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Key Largo. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Key Largo flight should consider departing on Monday evenings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from St. Louis to Key Largo

Explore weekly flight availability from St. Louis to Key Largo. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated December 25, 2024.

The most flights from STL to KE9 are scheduled on a Wednesday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Key Largo by month

Plan your trip to Key Largo by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Key Largo ranges from 1.6 - 9.9 inches per month. September is typically the wettest month, when rainfall can reach 9.9 in. January is typically the driest time to visit Key Largo when rainfall is around 1.6 in.

Temperature in Key Largo by month

Plan your trip to Key Largo by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Key Largo, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 68.0 F).

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Key Largo. Reviews last updated December 25, 2024.
Peruse reviews from past customers who have flown with American Airlines, Southwest and Frontier from St. Louis to Key Largo to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,758 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,758 reviews
Southwest
8.1
Very good
4,758 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,553 reviews
Southwest
8.1
Very good
4,758 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,580 reviews
Southwest
8.1
Very good
4,758 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,006 reviews
Southwest
8.1
Very good
4,758 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,758 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Key Largo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Key Largo?

    For a flight from St. Louis to Key Largo, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 4 outbound flights to Key Largo per day. 6 airlines have flights to Key Largo from Lambert-St Louis on a regular basis.

  • How popular is this St. Louis to Key Largo flight route?

    The Lambert-St Louis to Key Largo flight path was viewed by 6 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from St. Louis to Key Largo one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $61. Users have also found prices from $100 and $111 on Delta and Southwest, respectively.

  • What are the most reliable airlines from St. Louis to Key Largo?

    The top 3 most reliable airlines when flying from St. Louis to Key Largo are Southwest (90%), American Airlines (81%) and GOL (74%).

  • What are the cheapest flights from St. Louis to Key Largo?

    On average you can expect to pay $978 for a flight from St. Louis to Key Largo. The cheapest flight overall is $189 while the most popular route, (Lambert-St Louis - Miami) is currently priced at $200.

  • Can I find deals for flights from St. Louis to Key Largo that include hotel bookings?

    Yes. In addition to deals on St. Louis to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Key Largo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Key Largo.

  • Can I find deals for business class flights from St. Louis to Key Largo?

    Yes. Cheapflights offers flight deals from St. Louis to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Key Largo?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Key Largo (average of $230). Flying from St. Louis to Key Largo in March is currently the most expensive (average of $289). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 6 airlines flying from St. Louis to Key Largo

Discover the top 6 airlines that operate flights from St. Louis to Key Largo. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$70Average$150FlexibilityNo cancel feeOn-time65%
FrontierCheapest$147Average$232FlexibilityNo cancel feeOn-time62%
DeltaCheapest$218Average$420FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$224Average$395FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$272Average$432FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$287Average$503FlexibilityNo cancel feeOn-time69%
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