$190 Find Cheap Flights from St. Louis to Saint Lucia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Saint Lucia departing on 4/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Book Cheap St. Louis to Saint Lucia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Saint Lucia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Saint Lucia

Wed, Mar 11 - Wed, Mar 18
American Airlines Logo
5:22 am - 2:50 pmSTL-UVF
8h 28m1 stop
American Airlines Logo
3:50 pm - 11:37 pmUVF-STL
8h 47m1 stop
$575American Airlines
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Tue, Jan 20 - Thu, Jan 29
American Airlines Logo
3:40 pm - 3:03 pmSTL-UVF
21h 23m2 stops
American Airlines Logo
4:06 pm - 11:12 pmUVF-STL
9h 06m1 stop
$580American Airlines
Find Deal
Tue, Jan 20 - Thu, Jan 29
American Airlines Logo
10:17 am - 3:03 pmSTL-UVF
26h 46m1 stop
American Airlines Logo
4:06 pm - 11:12 pmUVF-STL
9h 06m1 stop
$584American Airlines
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Mon, Feb 9 - Tue, Feb 17
American Airlines Logo
3:54 pm - 3:03 pmSTL-UVF
21h 09m1 stop
American Airlines Logo
3:50 pm - 11:00 amUVF-STL
21h 10m2 stops
$588American Airlines
Find Deal
Mon, Feb 9 - Tue, Feb 17
American Airlines Logo
6:52 am - 3:03 pmSTL-UVF
30h 11m1 stop
American Airlines Logo
5:02 pm - 10:27 amUVF-STL
19h 25m1 stop
$595American Airlines
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Wed, Jan 7 - Tue, Jan 13
American Airlines Logo
6:02 pm - 1:46 pmSTL-UVF
17h 44m1 stop
American Airlines Logo
5:02 pm - 9:08 amUVF-STL
18h 06m1 stop
$600American Airlines
Find Deal
Wed, Jan 7 - Tue, Jan 13
American Airlines Logo
3:40 pm - 1:46 pmSTL-UVF
20h 06m2 stops
American Airlines Logo
5:02 pm - 9:24 amUVF-STL
18h 22m2 stops
$605American Airlines
Find Deal
Tue, Jan 6 - Mon, Jan 12
American Airlines Logo
6:52 am - 3:03 pmSTL-UVF
30h 11m1 stop
American Airlines Logo
5:02 pm - 9:08 amUVF-STL
18h 06m1 stop
$609American Airlines
Find Deal
Tue, Feb 3 - Tue, Feb 10
Multiple Airlines Logo
6:40 pm - 7:00 pmSTL-SLU
22h 20m3 stops
Multiple Airlines Logo
7:30 am - 3:29 pmSLU-STL
33h 59m3 stops
$1,707Multiple Airlines
Find Deal
Tue, Feb 3 - Tue, Feb 10
Multiple Airlines Logo
4:05 pm - 9:30 amSTL-SLU
15h 25m2 stops
Multiple Airlines Logo
7:30 am - 3:29 pmSLU-STL
33h 59m3 stops
$1,801Multiple Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for St. Louis to Saint Lucia flights

Get data-powered insights and trends into flights from St. Louis to Saint Lucia to help you find the cheapest flights, the best time to fly and much more.

Which airlines fly non-stop between St. Louis and Saint Lucia?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from St. Louis to Saint Lucia.

There are 2 airlines that fly nonstop from St. Louis to Saint Lucia. They are American Airlines and Delta. The cheapest airline for this route is American Airlines, with the best round-trip deal found costing $565 and arriving in Castries (UVF). On average, American Airlines offers the best prices for nonstop flights between St. Louis and Saint Lucia.

Which airlines provide the cheapest flights from St. Louis to Saint Lucia?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from St. Louis to Saint Lucia were found on American Airlines ($575) and Air Canada ($663).

Good to know

Low seasonSeptember
Cheapest flight$190
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from St. Louis to Castries

FAQs - booking Saint Lucia flights

  • How does KAYAK find such low prices on flights from St. Louis to Saint Lucia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Saint Lucia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Saint Lucia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to Saint Lucia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Saint Lucia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from St. Louis to Saint Lucia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Saint Lucia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from St. Louis to Saint Lucia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Saint Lucia?

    The cheapest time of day to fly to Saint Lucia is generally in the morning, when round-trip flights cost $749 on average. The most expensive time of day to fly to Saint Lucia is generally in the morning, which is peak travel time and where the average cost of a ticket is $749.

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.
7.9
DeltaOverall score based on 8009 reviews
8.1Boarding
7.9Comfort
7.3Food
7.9Entertainment
8.5Crew
Airline reviews

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

10.0 ExcellentJacky, Nov 2025JFK - LHR
Read more Delta reviews

Plenty of leg room, temperature was great and staff was excellent. Would do it more often.

The ticket agents in West Palm Beach on Friday afternoon Nov. 7th were incredible in getting us on an earlier plane to Atlanta during the government shutdown. Had the taken our original flight we would have missed our connection. She did this on her own, We didn't even have to ask, and she did it all with a smile and showing genuine concern that we would be taken care of. We are very grateful and thankful. We fly often, and now we will be sure to fly Delta.

Flight delayed then cancelled. Misplaced luggage. Still do not have. Rented car 1100 mile drive. I had to buy some overnight Hotels clothes toiletries gas food at my expense. Still not home. Not sure where luggage is. Over 4 hours on hold to Felta

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

we landed at cmh ten minutes early but had to sit on tarmac for twenty minutes because a plane was at our gate despite the fact that 3 other gates were open.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

I have a gluten allergy so did have any food

I have a gluten allergy so didn't have any food

Loved the crew . Absolutely no complaints. Except for luggage lost

Everything was good The connects, with no blame to crew. Or pilots. I understand they are short staffed. Everything went well for me. I'll be using you guys again in May if not sooner.

this plane was really old, had exit row seats and tray was in arm of seat so super uncomfortable to use. another seat they could t even use the tray it was broke. seat i. front of me had duct tape on it cause seat was ripped open... this plane should either be updated or retired.

We were very rushed by a staff member at the gate when transferring from American Airlines to Fijian. Then the plane stayed put for ages anyhow! The plane was delayed and my bag sent to San Francisco instead of Fiji

Baggage handling poor. Second time this has happened. My bag went to San Francisco instead of Fiji. No apology. Luckily Nadi airport staff are fantastic. My bag arrived in Fiji the next day.

We loved the steward on the plane. He made the night enjoyable

Everything you need to know for your flight from St. Louis to Saint Lucia

Information on your arrival and departure airports