$498 Find Cheap Flights from St. Louis to Saint Lucia - Compare and Save

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Price, demand and travel trends for St. Louis to Saint Lucia flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

Are flights from St. Louis to Saint Lucia cheaper or more expensive than last year?

Fares from St. Louis to Saint Lucia are running about 4% higher than they were around this time last year, averaging $782 round-trip.

What are the cheapest fares from St. Louis to Saint Lucia right now?

The cheapest fare from St. Louis to Saint Lucia in the last week was $498 round-trip, to Castries Hewanorra (UVF).

What’s the cheapest month to fly from St. Louis to Saint Lucia?

July is the cheapest time of year to fly, with average fares of $573. Prices are highest in December, when average flight costs increase to around $1,275.

Which airport in Saint Lucia is the cheapest to fly to from St. Louis?

All flights from St. Louis to Saint Lucia arrive at Castries Hewanorra (UVF). On average, round-trip fares are around $831.

What’s the cheapest day to fly from St. Louis to Saint Lucia?

Monday tends to be the cheapest day to fly from St. Louis to Saint Lucia, while Friday is the most expensive. Fares run about 44% higher that day, based on the past 12 months of KAYAK data.

What's the cheapest time of day to fly from St. Louis to Saint Lucia?

Data from the past 12 months shows it's cheapest to fly to Saint Lucia during the afternoon with average prices of $573. The morning is the most expensive time to fly, with average prices of $852.

Key details for St. Louis to Saint Lucia flights

Low season

January

Cheapest flight

$498
Beat the crowds with an average 34% drop in travelers.
The most popular month to fly with an average 24% increase in travelers.
Round-trip flight from St. Louis to Castries

Your St. Louis to Saint Lucia flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • Is now a good time to book a flight from St. Louis to Saint Lucia?

    Yes. Fares from St. Louis to Saint Lucia are low right now. As a rule of thumb, a round-trip under $745 (cheaper than most fares this year) is a good deal, so if you spot one at or below that, it's a good time to book.

  • How much should I budget for a flight from St. Louis to Saint Lucia?

    Over the past 12 months, round-trip fares from St. Louis to Saint Lucia have ranged from $745 to $1,040.

  • What are the main airports serving Saint Lucia?

    Flights to Saint Lucia use two main airports, Castries George F. L. Charle (SLU) and Castries Hewanorra (UVF).

  • What airlines fly nonstop from St. Louis to Saint Lucia?

    Based on the flight schedule for the next 3 months, no airline regularly operates nonstop flights from St. Louis to Saint Lucia. One-stop options include:

    • American Airlines
    • Delta
    • United Airlines

  • Which cabin classes are available on flights from St. Louis to Saint Lucia?

    On flights from St. Louis to Saint Lucia you can only book Economy Class.

Your guide to booking St. Louis to Saint Lucia flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your travel dates are flexible, book your trip for July when flights are typically cheapest and avoid December when prices are at their highest.
  • Flying on Monday is usually the cheapest. Flights on Friday cost about 44% more on average, so being flexible with your travel dates could help you save.
  • Start your trip in Castries, which is the most popular destination in Saint Lucia. From there, it's easy to continue on to other popular destinations such as Soufrière, Gros Islet and Vieux Fort.

Reviews of the top airlines flying from St. Louis to Saint Lucia

 
Need help choosing which airline to fly with from St. Louis to Saint Lucia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
DeltaOverall score based on 8650 reviews
7.2Food
7.8Comfort
8.5Crew
7.8Entertainment
8.1Boarding
Airline reviews

The flight was delayed and knowing I was going to miss my connection, nothing was done proactively to try and get me rebooked. It was an act of congress to do so. This is not on the crew, but on the experience itself

2.0 MediocreAmy, Sep 2026
Read more Delta reviews

The flight was delayed and knowing I was going to miss my connection, nothing was done proactively to try and get me rebooked. It was an act of congress to do so. This is not on the crew, but on the experience itself

Your survey needs a N/A option. I didn’t use the entertainment or eat food.

Flight was delayed multiple time and for more than 1 hr. My onward flight from BOS to MCI was also delayed. These delays have caused me so much inconvenience and Delta does nothing to ensure flights take off on time. No one knew why the inbound flight was delayed and what was the issue.

Our flight was delayed by over 4 hours due to a maintenance issue. They announced a new plane was on the way. We were given a $12 food voucher ( airport food is quite expensive You can’t even by a water and a small snack for 12:00. 4 hours later we boarded and landed in Atlanta at 10:20 ish pm. Of course we missed our connection and we were given a hotel voucher and another food voucher ! We didn’t make it home until 11:00 the next day ! Unacceptable

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Great flight with Delta! Boarding was quick and easy, the amenities were solid, and the plane was in great shape. The flight attendants had a fun, lively energy while staying professional. All in all, a smooth trip — even managed to catch up on some rest. Thanks, Delta!

My flight was canceled after being rescheduled for four days canceling my trip. Kayak and everyone affiliated with it I.e the airlines, and just fly have been excruciating to deal with. My trip to visit family had to be canceled as there was no way to make it. I am furious at all of you.

They delayed our flight because of bad weather in NY which was completely understandable. Then they cancelled our flight and a later flight that evening. The earliest we could fly was the next morning. We ended up buying last minute tickets on another airline and made it home slightly delayed but safely that evening. Delta kept saying it was weather related but if that was the case how did we make it back on another airline? The weather in NY was cloudy but not bad.

The plane smelled like a sewer. Multiple passengers complained. It’s a safety and quality issue to clean these planes.

We were delayed 2 hours leaving STL. I had 20 mins from when we landed in SLC terminal A to make it to SLC terminal B. I had to actually run! thankfully I made my flight but 3/4 legs were delayed to some capacity.

Staff in first class seemed to struggle to provide service to both sections. I didn’t get breakfast though I requested it. I only got coffee after asking the opposite side flight attendant and then could never see them to request a bottle of water.

My luggage was not sent with us. Not sure if this is Envoy Air responsibility but that was a very BAD experience

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

No enough space plus only allowing one laggage instead of two like other airlines.

Qatar airways ,boarding arrangements at Hamid international airport could been better

Two flight changes before the scheduled flight. On the day of the flight, the flight was delayed, which caused the connecting flight to be missed. Then, I was directed to another airport (CUN) and traveled to Tulum. American gave a $12 voucher for lunch. The least expensive item on the menu at a Mexican restaurant was $9.99. Driving to Tulum was a bad auto crash, and traffic was delayed two-plus hours. The bottom line is that we should have been at the hotel at noon, but it ended up at 11:30 PM.

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

Overall boarding and debarking is a joke. I dont even bring luggage anymore on trips because you can never allow them to be place then in the overhead bin or you have to pay or you check them which is even worse having to wait for your luggage on the tarmac.

More options for your flight from St. Louis to Saint Lucia

Complete your trip to Saint Lucia with a hotel stay or car rental