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$57+ Cheap flights from Key Largo, FL to St. Louis (STL)

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 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — STL
Dec 26 — Jan 21
Thu 12/26
Thu 1/2
1 adult, Economy
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The best prices from Key Largo to Lambert-St Louis are usually found in September or July, booked 59 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap flight deals from Key Largo to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Key Largo (KE9) to St. Louis (STL). 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 21, 2024.

Round-trip from

$168
(Booking.com)

One-way from

$57
(Mytrip)

Popular in

January

Cheapest in

September

Average price

$465
From Key Largo to Lambert-St Louis
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One-way flight from Key Largo to Lambert-St Louis
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High demand for flights, 18% potential price rise
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Best time to find cheap flights, 5% potential price drop
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Average for round-trip flights in December 2024
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Find flight deals from Key Largo to St. Louis

Cheapest flights from Key Largo to St. Louis
Explore the most affordable flight options available from Key Largo to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 21, 2024.

This American Airlines deal was found by Cheapflights users on 12/21. 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 12/319:40 pmMIA - STL
Nonstop3h 11mAmerican Airlines
Sun 1/56:00 amSTL - MIA
Nonstop3h 01mAmerican Airlines
Deal found 12/21$404
This United Airlines deal was found by Cheapflights users on 12/21. 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 12/3112:06 pmMIA - STL
1 stop8h 51mUnited Airlines
Sun 1/510:35 amSTL - MIA
1 stop6h 58mUnited Airlines
Deal found 12/21$413
This Mytrip deal was found by Cheapflights users on 12/21. 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 12/311:42 pmMIA - STL
2 stops22h 48mMultiple Airlines
Sun 1/55:15 pmSTL - MIA
3 stops29h 10mMultiple Airlines
Deal found 12/21$439
This Delta deal was found by Cheapflights users on 12/21. 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.
Fri 12/2710:14 amMIA - STL
1 stop5h 25mDelta
Fri 1/35:17 pmSTL - MIA
1 stop6h 37mDelta
Deal found 12/21$670
This Gotogate deal was found by Cheapflights users on 12/21. 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.
Thu 12/265:05 amMIA - STL
1 stop17h 14mFrontier
Thu 1/210:09 pmSTL - MIA
1 stop29h 51mFrontier
Deal found 12/21$816
This Southwest deal was found by Cheapflights users on 12/20. 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.
Wed 12/257:15 amMIA - STL
2 stops9h 25mSouthwest
Fri 12/273:10 pmSTL - MIA
1 stop6h 45mSouthwest
Deal found 12/20$879

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

Customize your flight search to find flights from Key Largo to St. Louis 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 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Thu 1/23

6:00 am-9:16 am

1 stop28h 16m

Lambert-St Louis

Fri 1/24

7:09 pm-5:09 pm

1 stop21h 00m

$168

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Wed 1/22

4:50 pm-10:09 pm

1 stop6h 19m

Lambert-St Louis

Sun 1/26

4:44 pm-8:32 pm

Nonstop2h 48m

$197

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Fri 2/21

6:15 am-2:36 pm

2 stops9h 21m

Lambert-St Louis

Sun 2/23

10:18 am-6:26 pm

1 stop7h 08m

$266

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Sat 2/22

5:40 am-1:20 pm

1 stop8h 40m

Lambert-St Louis

Tue 3/4

9:05 am-6:35 pm

2 stops8h 30m

$294

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Sat 2/22

5:00 pm-2:42 pm

2 stops22h 42m

Lambert-St Louis

Tue 3/4

6:26 pm-9:50 am

3 stops38h 24m

$302

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Thu 1/9

12:00 pm-3:44 pm

1 stop4h 44m

Lambert-St Louis

Sun 1/12

7:15 am-3:42 pm

1 stop7h 27m

$326

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Mon 1/27

7:15 pm-1:53 pm

2 stops19h 38m

Lambert-St Louis

Thu 1/30

2:49 pm-6:15 pm

2 stops26h 26m

$592

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Tue 1/28

8:00 am-9:16 am

1 stop26h 16m

$57

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Wed 1/22

7:00 am-11:47 am

1 stop5h 47m

$103

MiamiSt. Louis

MIA - STL

MIASTL

Miami

Tue 1/28

5:15 pm-7:25 pm

Nonstop3h 10m

$114

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 15 results
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Best time to book a flight from Key Largo to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Key Largo 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 Key Largo to St. Louis

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

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to St. Louis. Price data was last updated on December 13, 2024.

The price you pay for your flight from Key Largo to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, August is the cheapest month in which you can book a flight from Key Largo to St. Louis (average of $311). Flying from Key Largo to St. Louis in March is currently the most expensive (average of $356). 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 KE9 to STL?

Find hourly flight availability from Key Largo to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 21, 2024.

When flying from Key Largo to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Use this chart to determine the cheapest time to fly round-trip from Key Largo to St. Louis. Price data was last updated on June 23, 2024.

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

Weekly flight availability from Key Largo to St. Louis

Explore weekly flight availability from Key Largo to St. Louis. 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 21, 2024.

The most flights from KE9 to STL are scheduled on a Saturday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated December 21, 2024.
See what other customers who have flown with Delta, Frontier and American Airlines from Key Largo to St. Louis have to say. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,814 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

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
4,814 reviews
Southwest
8.1
Very good
4,814 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

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
9,540 reviews
Southwest
8.1
Very good
4,814 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

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
8,597 reviews
Southwest
8.1
Very good
4,814 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

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
9,035 reviews
Southwest
8.1
Very good
4,814 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

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
4,814 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

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 Key Largo to St. Louis. 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 into for flights to St. Louis from Key Largo?

    If you book a flight to St. Louis from Key Largo, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 4 flights from Key Largo to Lambert-St Louis per day from 5 different airlines.

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

    Flights from Key Largo to Lambert-St Louis have been viewed 3 times in the past calendar month.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $57. Delta flights start at $103 while deals on Southwest start at $114 one-way.

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

    Before booking your flight to St. Louis from Key Largo, check out the most reliable airlines to get you to your destination on time: Qatar Airways (88%), American Airlines (87%), Envoy Air( 82%).

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

    Looking at all options, your cheapest flight can be booked for $175. While the most popular route (Miami - Lambert-St Louis) can be booked for $170 on average our data indicates $373 when flying from Key Largo to St. Louis.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Key Largo to St. Louis 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 Key Largo to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Key Largo to St. Louis (average of $311). Flying from Key Largo to St. Louis in March is currently the most expensive (average of $356). 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 5 airlines flying from Key Largo to St. Louis

Discover the top 5 airlines that operate flights from Key Largo to St. Louis. 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 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$87Average$151FlexibilityNo cancel feeOn-time65%
FrontierCheapest$128Average$248FlexibilityNo cancel feeOn-time62%
DeltaCheapest$199Average$395FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$209Average$350FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$258Average$379FlexibilityNo cancel feeOn-time63%
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