Cheap flights from St. Louis to Key West from $185
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Key West departing on 11/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Find the cheapest flights from St. Louis to Key West
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Delta flights from St. Louis to Key West
Our best Delta deals on St. Louis to Key West flight tickets
American Airlines flights from St. Louis to Key West
Our best American Airlines deals on St. Louis to Key West flight tickets
momondo Fare Finder
Use the filters below to find and compare flights from St. Louis to Key West that are best for you.
Fly from
Fly to
Route
Depart
Return
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Wed 3/17
5:14 am-1:47 pm
1 stop7h 33m
Key West
Wed 3/24
7:22 pm-11:46 pm
1 stop5h 24m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Sat 12/12
2:33 pm-8:01 pm
1 stop4h 28m
Key West
Wed 12/16
7:25 am-11:29 am
1 stop5h 04m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Thu 11/5
12:14 pm-12:19 pm
2 stops23h 05m
Key West
Thu 11/12
10:59 am-11:16 pm
1 stop13h 17m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Mon 11/2
12:14 pm-12:36 pm
2 stops23h 22m
Key West
Thu 11/5
10:59 am-11:16 pm
1 stop13h 17m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Tue 12/1
12:36 pm-8:01 pm
1 stop6h 25m
Key West
Sat 12/5
6:06 pm-12:05 am
1 stop6h 59m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Tue 12/1
5:00 am-11:46 am
1 stop5h 46m
Key West
Sat 12/5
11:26 am-5:25 pm
1 stop6h 59m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Wed 11/11
7:24 am-4:55 pm
1 stop8h 31m
Key West
Tue 11/17
10:18 am-3:50 pm
1 stop6h 32m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Tue 2/9
7:20 am-1:08 pm
1 stop4h 48m
Key West
Tue 2/16
6:00 pm-11:39 pm
1 stop6h 39m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Fri 11/6
6:00 am-3:29 pm
1 stop8h 29m
Key West
Fri 11/13
2:51 pm-10:00 pm
1 stop8h 09m
St. LouisKey West
STL Lambert-St Louis - EYW Key West
STLEYW
Lambert-St Louis
Mon 10/26
8:30 am-3:29 pm
1 stop5h 59m
Key West
Mon 11/2
4:10 pm-11:24 pm
1 stop8h 14m
See travel insights to Key West from
How to get the cheapest flight ticket from St. Louis to Key West
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
What is the typical price of a round-trip flight between St. Louis and Key West?
Prices are currently low for flights on this route.
Typical prices usually range from $506 to $782.The lowest price recently found on this route was $323.
What is the cheapest month to fly to Key West?
In general, January is the cheapest month to fly from St. Louis to Key West. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $325. If you are unable to visit Key West during the month of January, then departing from St. Louis during the month February is also very affordable. Most momondo users find prices during this month for around $365.
How far in advance should I book a flight from St. Louis to Key West?
You are more likely to see cheaper flights to Key West from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Key West for around $485 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Key West from St. Louis for as low as $308 on momondo.
What is the cheapest airline that flies from Lambert-St Louis to Key West?
United Airlines and Delta are the most popular carriers operating from Lambert-St Louis to Key West
What airlines fly to Key West?
American Airlines, Delta and United Airlines are the top three most popular airlines that fly to Key West from St. Louis according to our data. American Airlines is the first choice among our users, with 67% of people opting to fly with this airline when traveling to Key West. Keep in mind that there are 3 different airlines that fly to Key West on a routine basis, so you have a few additional options to choose from.
Which airport is the most popular layover for flights between St. Louis and Key West?
Miami (MIA) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from St. Louis to Key West?
Flights via Charlotte (CLT) offer the lowest average round-trip price of $222.
Which layover airport has the shortest travel time from St. Louis to Key West?
Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 4h 17m.
Which layover airport has the shortest connection time from St. Louis to Key West?
Atlanta (ATL) has the shortest average layover time for this route: 1h 17m.
When to book flights from St. Louis to Key West
Cheap St. Louis to Key West (STL to EYW) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Key West
Frequently asked questions about flying from St. Louis to Key West
How far is Lambert-St Louis to Key West by plane?
A flight from Lambert-St Louis to Key West will travel around 1088.7 mi. 4h 28m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to Key West Airport?
Prices for flights from Lambert-St Louis Airport to Key West Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Key West Airport?
As of October 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Key West Airport.
How old do you have to be to fly from Lambert-St Louis Airport to Key West Airport?
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 Key West Airport.
What documentation or ID do you need to fly to Key West Airport?
The necessary travel and health documents for your Key West Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to Key West?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Key West is American Airlines (66% of total bookings). The next most popular airlines are Delta (27%) and United Airlines (7%).
Best airlines flying from St. Louis to Key West
Compare and see reviews for airlines that fly from St. Louis to Key West with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $223 | Free Cancellation | Rating 7.0 12,146 reviews | |||
| PriceFrom $255 | Free Cancellation | Rating 7.8 8,646 reviews | |||
| PriceFrom $292 | Free Cancellation | Rating 7.4 10,322 reviews |
Traveling to a place near Key West?
Book flights to Key West if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to Key West?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Key West for you.
Can I find flights from St. Louis to Key West with flexible booking policies on momondo?
Flights from St. Louis to Key West 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 Key West?
Once you have performed a search for St. Louis to Key West flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from St. Louis to Key West right now. Can momondo alert me if prices change?
Yes. momondo can track prices for St. Louis to Key West flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.