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Cheap flights from St. Louis to Saint Lucia from $575

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Saint Lucia departing on 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Saint Lucia

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:05 am - 2:50 pm
STL
-
UVF
7h 45m1 stop
American Airlines Logo
4:25 pm - 8:32 am
UVF
-
STL
18h 07m1 stop
$575American Airlines
Sun, Mar 1 - Fri, Mar 6
American Airlines Logo
6:58 pm - 4:00 pm
STL
-
UVF
19h 02m2 stops
American Airlines Logo
3:50 pm - 8:32 am
UVF
-
STL
18h 42m2 stops
$580American Airlines
Sun, Mar 1 - Fri, Mar 6
American Airlines Logo
6:02 pm - 2:10 pm
STL
-
UVF
18h 08m1 stop
American Airlines Logo
5:02 pm - 11:59 pm
UVF
-
STL
8h 57m1 stop
$600American Airlines
Fri, Jan 23 - Fri, Jan 30
American Airlines Logo
5:05 am - 4:00 pm
STL
-
UVF
8h 55m1 stop
American Airlines Logo
3:50 pm - 10:59 am
UVF
-
STL
21h 09m2 stops
$605American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
5:05 am - 4:00 pm
STL
-
UVF
8h 55m1 stop
American Airlines Logo
3:50 pm - 10:26 am
UVF
-
STL
20h 36m1 stop
$612American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
10:17 am - 3:03 pm
STL
-
UVF
26h 46m1 stop
American Airlines Logo
5:02 pm - 11:03 am
UVF
-
STL
20h 01m2 stops
$613American Airlines
Sat, Jan 31 - Sat, Feb 7
American Airlines Logo
3:54 pm - 4:00 pm
STL
-
UVF
22h 06m2 stops
American Airlines Logo
3:50 pm - 10:26 am
UVF
-
STL
20h 36m1 stop
$616American Airlines
Wed, Feb 11 - Tue, Feb 17
American Airlines Logo
10:00 am - 4:00 pm
STL
-
UVF
28h 00m1 stop
American Airlines Logo
5:00 pm - 10:26 am
UVF
-
STL
19h 26m1 stop
$624American Airlines
Wed, Feb 11 - Tue, Feb 17
Multiple Airlines Logo
4:05 pm - 3:15 pm
STL
-
SLU
21h 10m3 stops
Multiple Airlines Logo
6:20 pm - 3:29 pm
SLU
-
STL
23h 09m2 stops
$1,582Multiple Airlines
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
4:05 pm - 3:15 pm
STL
-
SLU
21h 10m3 stops
Multiple Airlines Logo
3:45 pm - 3:29 pm
SLU
-
STL
25h 44m3 stops
$1,779Multiple Airlines
Sun, Feb 1 - Sat, Feb 7

American Airlines flights from St. Louis to Saint Lucia

Our best American Airlines deals on St. Louis to Saint Lucia flight tickets
American Airlines
Jan 23
STL6:02 pmLambert-St Louis
18h 08m
1 stop
UVF2:10 pmCastries Hewanorra
Jan 30
UVF5:02 pmCastries Hewanorra
8h 57m
1 stop
STL11:59 pmLambert-St Louis
$600
Find similar
American Airlines
Feb 16
STL5:05 amLambert-St Louis
8h 55m
1 stop
UVF4:00 pmCastries Hewanorra
Feb 23
UVF3:50 pmCastries Hewanorra
21h 09m
2 stops
STL10:59 amLambert-St Louis
$605
Find similar
American Airlines
Feb 16
STL5:05 amLambert-St Louis
8h 55m
1 stop
UVF4:00 pmCastries Hewanorra
Feb 23
UVF3:50 pmCastries Hewanorra
20h 36m
1 stop
STL10:26 amLambert-St Louis
$612
Find similar

Delta flights from St. Louis to Saint Lucia

Our best Delta deals on St. Louis to Saint Lucia flight tickets
Delta
Mar 30
STL6:59 pmLambert-St Louis
18h 05m
1 stop
UVF2:04 pmCastries Hewanorra
Apr 1
UVF3:24 pmCastries Hewanorra
18h 28m
1 stop
STL8:52 amLambert-St Louis
$575
Find similar
Delta
Mar 30
STL6:59 pmLambert-St Louis
18h 05m
1 stop
UVF2:04 pmCastries Hewanorra
Apr 5
UVF3:24 pmCastries Hewanorra
9h 18m
1 stop
STL11:42 pmLambert-St Louis
$710
Find similar
Delta
Jan 2
STL6:00 amLambert-St Louis
7h 30m
1 stop
UVF3:30 pmCastries Hewanorra
Jan 7
UVF4:25 pmCastries Hewanorra
9h 14m
1 stop
STL11:39 pmLambert-St Louis
$796
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Saint Lucia 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, momondo users made 832,500 searches. Data last updated December 4, 2025.
Use the filters below to find and compare flights from St. Louis to Saint Lucia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sun 3/1

5:05 am-2:50 pm

1 stop7h 45m

Castries Hewanorra

Fri 3/6

4:25 pm-8:32 am

1 stop18h 07m

$575

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sun 3/1

6:58 pm-4:00 pm

2 stops19h 02m

Castries Hewanorra

Fri 3/6

3:50 pm-8:32 am

2 stops18h 42m

$580

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Fri 1/23

6:02 pm-2:10 pm

1 stop18h 08m

Castries Hewanorra

Fri 1/30

5:02 pm-11:59 pm

1 stop8h 57m

$600

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

5:05 am-4:00 pm

1 stop8h 55m

Castries Hewanorra

Mon 2/23

3:50 pm-10:59 am

2 stops21h 09m

$605

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

5:05 am-4:00 pm

1 stop8h 55m

Castries Hewanorra

Mon 2/23

3:50 pm-10:26 am

1 stop20h 36m

$612

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 1/31

10:17 am-3:03 pm

1 stop26h 46m

Castries Hewanorra

Sat 2/7

5:02 pm-11:03 am

2 stops20h 01m

$613

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 2/11

3:54 pm-4:00 pm

2 stops22h 06m

Castries Hewanorra

Tue 2/17

3:50 pm-10:26 am

1 stop20h 36m

$616

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 2/11

10:00 am-4:00 pm

1 stop28h 00m

Castries Hewanorra

Tue 2/17

5:00 pm-10:26 am

1 stop19h 26m

$624

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Sun 2/1

4:05 pm-3:15 pm

3 stops21h 10m

Castries George F. L. Charle

Sat 2/7

6:20 pm-3:29 pm

2 stops23h 09m

$1,582

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Sun 2/1

4:05 pm-3:15 pm

3 stops21h 10m

Castries George F. L. Charle

Sat 2/7

3:45 pm-3:29 pm

3 stops25h 44m

$1,779

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Saint Lucia from

How to get the cheapest flight ticket from St. Louis to Saint Lucia

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 day to depart on your flight to Saint Lucia?

Our data shows that Wednesday is the least expensive day to fly to Saint Lucia. Tickets to fly out on this day can be as low as $591. On the other hand, Thursday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $862.

Cheap St. Louis to Saint Lucia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Saint Lucia

Fastest flight time

7h 04m

Direct flights

None
The fastest flight from St. Louis to Saint Lucia takes 7h 04m
There are no direct flights from St. Louis to Saint Lucia. There are no popular flight routes from St. Louis to Saint Lucia.
Search flight deals

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Saint Lucia?

    Prices for flights from Lambert-St Louis Airport to Saint Lucia were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Saint Lucia?

  • How old do you have to be to fly from Lambert-St Louis Airport to Saint Lucia?

    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 Saint Lucia.

  • What documentation or ID do you need to fly to Saint Lucia?

    The necessary travel and health documents for your Saint Lucia 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.

Best airlines flying from St. Louis to Saint Lucia

Compare and see reviews for airlines that fly from St. Louis to Saint Lucia with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $565Free CancellationRating
7.9
8,011 reviews
Search Delta flights
American AirlinesPriceFrom $568Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Saint Lucia?

Finding the right flight to Saint Lucia from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Saint Lucia quick and easy, saving you time and money.

Can I find flights from St. Louis to Saint Lucia with flexible booking policies on momondo?

All flight searches from St. Louis to Saint Lucia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Saint Lucia?

momondo provides multiple filters to help you find the best flight to Saint Lucia from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to Saint Lucia right now. Can momondo alert me if prices change?

Price alerts on flights to Saint Lucia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Popular flights according to clicks in the last 7 days on momondo
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