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$202+ Cheap flights from St. Louis to Key West (STL - EYW)

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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — EYW
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Key West are usually found in September or August, booked 63 days in advance, depart on a Friday or Tuesday and return on a Wednesday

Cheap flight deals from St. Louis to Key West

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Key West (EYW). 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 June 12, 2025.

Round-trip from

$223
(American Airlines)

One-way from

$202
(Mytrip)

Popular in

March

Cheapest in

September

Average price

$492
From Lambert-St Louis to Key West
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One-way flight from Lambert-St Louis to Key West
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Highest demand for flights based on searches. 6% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from St. Louis to Key West

Cheapest flights from St. Louis to Key West
Explore the most affordable flight options available from St. Louis to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/11. 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.
Sat 8/237:32 amSTL - EYW
1 stop7h 47mAmerican Airlines
Sat 8/307:40 pmEYW - STL
1 stop5h 19mAmerican Airlines
Deal found 6/11$223
This Delta deal was found by Cheapflights users on 6/11. 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.
Sat 7/261:23 pmSTL - EYW
1 stop5h 26mDelta
Wed 7/306:27 pmEYW - STL
1 stop6h 26mDelta
Deal found 6/11$257
This United Airlines deal was found by Cheapflights users on 6/9. 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.
Thu 9/48:20 amSTL - EYW
2 stops26h 55mUnited Airlines
Sun 9/76:45 pmEYW - STL
2 stops25h 13mUnited Airlines
Deal found 6/9$354
This Mytrip deal was found by Cheapflights users on 6/11. 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.
Thu 7/2410:47 amSTL - EYW
3 stops28h 49mMultiple Airlines
Wed 7/3010:02 amEYW - STL
2 stops24h 50mMultiple Airlines
Deal found 6/11$374

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Key West 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 June 12, 2025.
Use the filters below to find and compare flights from St. Louis to Key West that are best for you.

Fly from

St. Louis

Fly to

Key West

Route

Depart

Return

Price

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Sat 8/23

7:32 am-4:19 pm

1 stop7h 47m

Key West

Sat 8/30

7:40 pm-11:59 pm

1 stop5h 19m

$223

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Sat 7/26

1:23 pm-7:49 pm

1 stop5h 26m

Key West

Wed 7/30

6:27 pm-11:53 pm

1 stop6h 26m

$257

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Thu 9/4

8:20 am-12:15 pm

2 stops26h 55m

Key West

Sun 9/7

6:45 pm-6:58 pm

2 stops25h 13m

$354

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Thu 7/24

10:47 am-4:36 pm

3 stops28h 49m

Key West

Wed 7/30

10:02 am-9:52 am

2 stops24h 50m

$374

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Mon 7/14

10:47 am-9:22 am

2 stops21h 35m

$202

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Mon 7/14

5:15 am-2:09 pm

1 stop7h 54m

$247

St. LouisKey West

STL - EYW

STLEYW

Lambert-St Louis

Mon 6/16

8:10 am-6:05 pm

2 stops8h 55m

$399

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Best time to book a flight from St. Louis to Key West

Have a flexible travel schedule? Discover the best time to fly to Key West 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Key West

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Key West. Price data was last updated on June 9, 2025.

Booking 63 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Key West. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, August is the cheapest month in which you can book a flight from St. Louis to Key West (average of $328). Flying from St. Louis to Key West in March is currently the most expensive (average of $493). 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.

Rainfall in Key West by month

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

In terms of precipitation, rainfall in Key West ranges from 1.5 - 6.7 inches per month. September is typically the wettest month, when rainfall can reach 6.7 in. February is typically the driest time to visit Key West when rainfall is around 1.5 in.

Temperature in Key West by month

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

If weather is an important factor for your trip to Key West, use this chart to help with planning. For those seeking warmer temperatures, June 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 69.8 F).

Reviews of airlines servicing Key West

Get insights into the airlines that provide service to Key West. 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 West. Reviews last updated June 12, 2025.
See what other customers who have flown with Delta, United Airlines and American Airlines from St. Louis to Key West have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Mark,Jun 2024

SGF - ATL

One of the worst flights ever. I got to the airport early for my 6:48 pm flight and tried to get on the 4:30 ish flight. The gate agent was one of the worst customer service people in my 20 yrs of flying Delta. Very rude and wouldn’t even talk to me about riding standby. Then flight took off 3 hrs late and when Landed in Atlanta, the gate people wouldn’t even try to get me on the plane. It was still there but door was closed. For all of my almost 2 million miles, the worst experience from Delta. I am highly disappointed as it was not my fault I have to sleep in Atlanta and not Jacksonville Florida
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Mark,Jun 2024

SGF - ATL

One of the worst flights ever. I got to the airport early for my 6:48 pm flight and tried to get on the 4:30 ish flight. The gate agent was one of the worst customer service people in my 20 yrs of flying Delta. Very rude and wouldn’t even talk to me about riding standby. Then flight took off 3 hrs late and when Landed in Atlanta, the gate people wouldn’t even try to get me on the plane. It was still there but door was closed. For all of my almost 2 million miles, the worst experience from Delta. I am highly disappointed as it was not my fault I have to sleep in Atlanta and not Jacksonville Florida
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Mark,Jun 2024

SGF - ATL

One of the worst flights ever. I got to the airport early for my 6:48 pm flight and tried to get on the 4:30 ish flight. The gate agent was one of the worst customer service people in my 20 yrs of flying Delta. Very rude and wouldn’t even talk to me about riding standby. Then flight took off 3 hrs late and when Landed in Atlanta, the gate people wouldn’t even try to get me on the plane. It was still there but door was closed. For all of my almost 2 million miles, the worst experience from Delta. I am highly disappointed as it was not my fault I have to sleep in Atlanta and not Jacksonville Florida
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Mark,Jun 2024

SGF - ATL

One of the worst flights ever. I got to the airport early for my 6:48 pm flight and tried to get on the 4:30 ish flight. The gate agent was one of the worst customer service people in my 20 yrs of flying Delta. Very rude and wouldn’t even talk to me about riding standby. Then flight took off 3 hrs late and when Landed in Atlanta, the gate people wouldn’t even try to get me on the plane. It was still there but door was closed. For all of my almost 2 million miles, the worst experience from Delta. I am highly disappointed as it was not my fault I have to sleep in Atlanta and not Jacksonville Florida

Related info for your journey

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

  • What are the cheapest airlines flying from St. Louis to Key West round-trip?

    Our cheapest airline available from St. Louis to Key West is American Airlines. Our recent data shows that you can find tickets from as low as $223 on this airline. Additional options worth looking into are Delta and United Airlines, starting at $257 and $354 round-trip. Users have found that American Airlines is 48% cheaper than the other options available to this destination.

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

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

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

    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 West.

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

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

    Currently, August is the cheapest month in which you can book a flight from St. Louis to Key West (average of $328). Flying from St. Louis to Key West in March is currently the most expensive (average of $493). 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.

See more FAQs

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Top 3 airlines flying from St. Louis to Key West

Discover the top 3 airlines that operate flights from St. Louis to Key West. 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$224Average$453FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$231Average$427FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$245Average$536FlexibilityNo cancel feeOn-time69%

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