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Cheap flights from St. Louis to Saint Lucia from $543

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 3/29. 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.
Air Canada Logo
4:05 pm - 3:25 pm
STL
-
UVF
22h 20m1 stop
Air Canada Logo
4:20 pm - 3:24 pm
UVF
-
STL
24h 04m1 stop
$543Air Canada
Sun, Mar 29 - Fri, Apr 3
Air Canada Logo
4:05 pm - 4:25 pm
STL
-
UVF
22h 20m1 stop
Air Canada Logo
5:15 pm - 3:29 pm
UVF
-
STL
24h 14m1 stop
$569Air Canada
Wed, Feb 4 - Wed, Feb 11
American Airlines Logo
5:05 am - 4:00 pm
STL
-
UVF
8h 55m1 stop
American Airlines Logo
4:25 pm - 9:43 am
UVF
-
STL
19h 18m1 stop
$600American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
6:58 pm - 4:00 pm
STL
-
UVF
19h 02m2 stops
American Airlines Logo
3:50 pm - 9:43 am
UVF
-
STL
19h 53m2 stops
$605American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
5:05 am - 2:50 pm
STL
-
UVF
7h 45m1 stop
American Airlines Logo
5:00 pm - 10:26 am
UVF
-
STL
19h 26m1 stop
$612American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
6:52 am - 3:03 pm
STL
-
UVF
30h 11m1 stop
American Airlines Logo
3:50 pm - 9:43 am
UVF
-
STL
19h 53m2 stops
$613American Airlines
Tue, Feb 10 - Mon, Feb 16
American Airlines Logo
6:02 pm - 1:46 pm
STL
-
UVF
17h 44m1 stop
American Airlines Logo
4:25 pm - 8:32 am
UVF
-
STL
18h 07m1 stop
$621American Airlines
Thu, Feb 5 - Thu, Feb 12
American Airlines Logo
5:59 pm - 3:03 pm
STL
-
UVF
19h 04m2 stops
American Airlines Logo
5:02 pm - 11:59 pm
UVF
-
STL
8h 57m1 stop
$626American Airlines
Wed, Feb 4 - Wed, Feb 11
American Airlines Logo
5:29 am - 1:15 pm
STL
-
UVF
6h 46m1 stop
American Airlines Logo
4:05 pm - 8:05 am
UVF
-
STL
17h 00m1 stop
$629American Airlines
Tue, Apr 14 - Tue, Apr 21
Multiple Airlines Logo
4:05 pm - 9:30 am
STL
-
SLU
15h 25m2 stops
Multiple Airlines Logo
4:20 pm - 3:29 pm
SLU
-
STL
49h 09m2 stops
$3,541Multiple Airlines
Tue, Feb 10 - Mon, Feb 16

Air Canada flights from St. Louis to Saint Lucia

Our best Air Canada deals on St. Louis to Saint Lucia flight tickets
Air Canada
Feb 4
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF4:25 pmCastries Hewanorra
Feb 11
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$569
Find similar
Air Canada
Jan 7
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF4:25 pmCastries Hewanorra
Jan 12
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$705
Find similar
Air Canada
Feb 2
STL6:40 pmLambert-St Louis
43h 40m
2 stops
UVF4:20 pmCastries Hewanorra
Feb 5
UVF5:15 pmCastries Hewanorra
29h 43m
2 stops
STL8:58 pmLambert-St Louis
$1,039
Find similar

American Airlines flights from St. Louis to Saint Lucia

Our best American Airlines deals on St. Louis to Saint Lucia flight tickets
American Airlines
Feb 16
STL6:50 pmLambert-St Louis
19h 10m
2 stops
UVF4:00 pmCastries Hewanorra
Feb 23
UVF5:00 pmCastries Hewanorra
21h 31m
2 stops
STL12:31 pmLambert-St Louis
$605
Find similar
American Airlines
Feb 16
STL5:05 amLambert-St Louis
7h 45m
1 stop
UVF2:50 pmCastries Hewanorra
Feb 23
UVF3:50 pmCastries Hewanorra
20h 36m
1 stop
STL10:26 amLambert-St Louis
$612
Find similar
American Airlines
Feb 5
STL6:02 pmLambert-St Louis
17h 44m
1 stop
UVF1:46 pmCastries Hewanorra
Feb 12
UVF4:25 pmCastries Hewanorra
18h 07m
1 stop
STL8:32 amLambert-St Louis
$621
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 23, 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 3/29

4:05 pm-3:25 pm

1 stop22h 20m

Castries Hewanorra

Fri 4/3

4:20 pm-3:24 pm

1 stop24h 04m

$543

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 2/4

4:05 pm-4:25 pm

1 stop22h 20m

Castries Hewanorra

Wed 2/11

5:15 pm-3:29 pm

1 stop24h 14m

$569

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

4:25 pm-9:43 am

1 stop19h 18m

$600

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

6:58 pm-4:00 pm

2 stops19h 02m

Castries Hewanorra

Mon 2/23

3:50 pm-9:43 am

2 stops19h 53m

$605

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

5:05 am-2:50 pm

1 stop7h 45m

Castries Hewanorra

Mon 2/23

5:00 pm-10:26 am

1 stop19h 26m

$612

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 2/10

6:52 am-3:03 pm

1 stop30h 11m

Castries Hewanorra

Mon 2/16

3:50 pm-9:43 am

2 stops19h 53m

$613

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Thu 2/5

6:02 pm-1:46 pm

1 stop17h 44m

Castries Hewanorra

Thu 2/12

4:25 pm-8:32 am

1 stop18h 07m

$621

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 2/4

5:59 pm-3:03 pm

2 stops19h 04m

Castries Hewanorra

Wed 2/11

5:02 pm-11:59 pm

1 stop8h 57m

$626

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 4/14

5:29 am-1:15 pm

1 stop6h 46m

Castries Hewanorra

Tue 4/21

4:05 pm-8:05 am

1 stop17h 00m

$629

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Tue 2/10

4:05 pm-9:30 am

2 stops15h 25m

Castries George F. L. Charle

Mon 2/16

4:20 pm-3:29 pm

2 stops49h 09m

$3,541

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

6h 54m

Direct flights

None
The fastest flight from St. Louis to Saint Lucia takes 6h 54m
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
American AirlinesPriceFrom $532Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights
DeltaPriceFrom $565Free CancellationRating
7.9
8,014 reviews
Search Delta 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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