Cheap flights from St. Louis to Key West from $202
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 7/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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 cheapest month to fly to Key West?
In general, September 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 $358. If you are unable to visit Key West during the month of September, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $372.
What is the cheapest day to depart on your flight to Key West?
On average, the least expensive day to fly to Key West from St. Louis is on a Friday. momondo users have found tickets for Friday departures for as low as $376. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Key West for around $557.
What is the cheapest time of day to depart on your flight to Key West?
According to our data, the cheapest time of day to fly to Key West is at noon. momondo users have found flights departing from St. Louis to Key West at noon 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 to Key West are more costly in the afternoon, with an average ticket price of $470. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.
How far in advance should I book a flight to Key West?
You are more likely to see cheaper flights to Key West from St. Louis when booking 12 weeks ahead of your departure date. In general, you can expect to find flights to Key West for around $431 when searching 12 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 $343 on momondo.
What is the cheapest airline that flies from Lambert-St Louis to Key West?
American Airlines is the most popular carrier 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 68% 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.
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
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 48m 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 June 2025, 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 (68% of total bookings). The next most popular airlines are Delta (30%) and United Airlines (2%).
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 $224 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $231 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $245 | Free Cancellation | Rating 7.4 8,790 reviews |
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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.