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Cheap flights from St. Louis to Saint Lucia from $323

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 Saint Lucia departing on 1/7. 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 - 4:20 pmSTL-UVF
22h 15m1 stop
Air Canada Logo
5:15 pm - 3:29 pmUVF-STL
24h 14m1 stop
$442Air Canada
Find Deal
Tue, Jan 6 - Wed, Jan 14
Air Canada Logo
4:05 pm - 3:30 pmSTL-UVF
22h 25m1 stop
Air Canada Logo
4:20 pm - 3:24 pmUVF-STL
24h 04m1 stop
$548Air Canada
Find Deal
Sun, Mar 29 - Fri, Apr 3
American Airlines Logo
7:34 am - 1:15 pmSTL-UVF
28h 41m1 stop
American Airlines Logo
4:05 pm - 8:05 amUVF-STL
17h 00m1 stop
$584American Airlines
Find Deal
Sat, Apr 25 - Fri, May 1
American Airlines Logo
2:34 pm - 1:15 pmSTL-UVF
21h 41m1 stop
American Airlines Logo
4:05 pm - 9:59 amUVF-STL
18h 54m2 stops
$588American Airlines
Find Deal
Sat, Apr 25 - Fri, May 1
American Airlines Logo
6:00 pm - 1:15 pmSTL-UVF
18h 15m2 stops
American Airlines Logo
4:05 pm - 9:59 amUVF-STL
18h 54m2 stops
$592American Airlines
Find Deal
Sat, Apr 25 - Fri, May 1
American Airlines Logo
6:02 pm - 1:46 pmSTL-UVF
17h 44m1 stop
American Airlines Logo
4:06 pm - 11:12 pmUVF-STL
9h 06m1 stop
$600American Airlines
Find Deal
Wed, Jan 7 - Wed, Jan 14
American Airlines Logo
5:59 pm - 3:03 pmSTL-UVF
19h 04m2 stops
American Airlines Logo
5:02 pm - 9:40 amUVF-STL
18h 38m2 stops
$605American Airlines
Find Deal
Tue, Jan 6 - Mon, Jan 12
Multiple Airlines Logo
10:45 am - 3:30 pmSTL-UVF
27h 45m3 stops
Multiple Airlines Logo
4:20 pm - 9:44 amUVF-STL
18h 24m2 stops
$1,700Multiple Airlines
Find Deal
Sun, Mar 29 - Fri, Apr 3
United Airlines Logo
6:30 am - 4:25 pmSTL-UVF
7h 55m1 stop
United Airlines Logo
1:52 pm - 9:43 pmUVF-STL
9h 51m1 stop
$2,019United Airlines
Find Deal
Sat, Dec 20 - Sat, Dec 27
Multiple Airlines Logo
4:05 pm - 3:35 pmSTL-SLU
46h 30m2 stops
Multiple Airlines Logo
12:30 pm - 3:29 pmSLU-STL
51h 59m3 stops
$3,654Multiple Airlines
Find Deal
Sat, Mar 14 - Sun, Mar 22

Air Canada flights from St. Louis to Saint Lucia

Our best Air Canada deals on St. Louis to Saint Lucia flight tickets
Air Canada
Jan 6
STL4:05 pmLambert-St Louis
22h 15m
1 stop
UVF4:20 pmCastries Hewanorra
Jan 14
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$442
Find similar
Air Canada
Mar 29
STL4:05 pmLambert-St Louis
22h 25m
1 stop
UVF3:30 pmCastries Hewanorra
Apr 3
UVF4:20 pmCastries Hewanorra
24h 04m
1 stop
STL3:24 pmLambert-St Louis
$548
Find similar
Air Canada
Jan 6
STL4:05 pmLambert-St Louis
22h 15m
1 stop
UVF4:20 pmCastries Hewanorra
Jan 14
UVF5:15 pmCastries Hewanorra
29h 43m
2 stops
STL8:58 pmLambert-St Louis
$638
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
Apr 25
STL7:34 amLambert-St Louis
28h 41m
1 stop
UVF1:15 pmCastries Hewanorra
May 1
UVF4:05 pmCastries Hewanorra
17h 00m
1 stop
STL8:05 amLambert-St Louis
$584
Find similar
American Airlines
Apr 25
STL2:34 pmLambert-St Louis
21h 41m
1 stop
UVF1:15 pmCastries Hewanorra
May 1
UVF4:05 pmCastries Hewanorra
18h 54m
2 stops
STL9:59 amLambert-St Louis
$588
Find similar
American Airlines
Apr 25
STL6:00 pmLambert-St Louis
18h 15m
2 stops
UVF1:15 pmCastries Hewanorra
May 1
UVF4:05 pmCastries Hewanorra
18h 54m
2 stops
STL9:59 amLambert-St Louis
$592
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 November 6, 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

Tue 1/6

4:05 pm-4:20 pm

1 stop22h 15m

Castries Hewanorra

Wed 1/14

5:15 pm-3:29 pm

1 stop24h 14m

$442

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sun 3/29

4:05 pm-3:30 pm

1 stop22h 25m

Castries Hewanorra

Fri 4/3

4:20 pm-3:24 pm

1 stop24h 04m

$548

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 4/25

7:34 am-1:15 pm

1 stop28h 41m

Castries Hewanorra

Fri 5/1

4:05 pm-8:05 am

1 stop17h 00m

$584

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 4/25

2:34 pm-1:15 pm

1 stop21h 41m

Castries Hewanorra

Fri 5/1

4:05 pm-9:59 am

2 stops18h 54m

$588

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 4/25

6:00 pm-1:15 pm

2 stops18h 15m

Castries Hewanorra

Fri 5/1

4:05 pm-9:59 am

2 stops18h 54m

$592

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 1/7

6:02 pm-1:46 pm

1 stop17h 44m

Castries Hewanorra

Wed 1/14

4:06 pm-11:12 pm

1 stop9h 06m

$600

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 1/6

5:59 pm-3:03 pm

2 stops19h 04m

Castries Hewanorra

Mon 1/12

5:02 pm-9:40 am

2 stops18h 38m

$605

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sun 3/29

10:45 am-3:30 pm

3 stops27h 45m

Castries Hewanorra

Fri 4/3

4:20 pm-9:44 am

2 stops18h 24m

$1,700

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 12/20

6:30 am-4:25 pm

1 stop7h 55m

Castries Hewanorra

Sat 12/27

1:52 pm-9:43 pm

1 stop9h 51m

$2,019

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Sat 3/14

4:05 pm-3:35 pm

2 stops46h 30m

Castries George F. L. Charle

Sun 3/22

12:30 pm-3:29 pm

3 stops51h 59m

$3,654

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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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

Direct flights

None
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 $565Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
DeltaPriceFrom $565Free CancellationRating
7.9
8,001 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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Popular flights according to clicks in the last 7 days on momondo
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