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Cheap flights from St. Louis to Saint Lucia from $369

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 8/15. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
2:40 pm - 2:20 pm
STL
-
UVF
22h 40m
1 stop
Air Canada Logo
3:15 pm - 2:02 pm
UVF
-
STL
23h 47m
1 stop
$560Air Canada
Mon, Aug 10 - Tue, Aug 18
Air Canada Logo
12:10 pm - 2:20 pm
STL
-
UVF
25h 10m
2 stops
Air Canada Logo
3:15 pm - 2:02 pm
UVF
-
STL
23h 47m
1 stop
$563Air Canada
Mon, Aug 10 - Tue, Aug 18
Air Canada Logo
4:15 pm - 4:25 pm
STL
-
UVF
22h 10m
1 stop
Air Canada Logo
5:25 pm - 3:30 pm
UVF
-
STL
24h 05m
1 stop
$564Air Canada
Wed, Nov 4 - Wed, Nov 18
Air Canada Logo
2:40 pm - 2:20 pm
STL
-
UVF
22h 40m
1 stop
Air Canada Logo
3:15 pm - 2:02 pm
UVF
-
STL
23h 47m
1 stop
$574Air Canada
Mon, Aug 10 - Tue, Aug 18
Air Canada Logo
12:10 pm - 2:20 pm
STL
-
UVF
25h 10m
2 stops
Air Canada Logo
3:15 pm - 2:02 pm
UVF
-
STL
23h 47m
1 stop
$577Air Canada
Mon, Aug 10 - Tue, Aug 18
Air Canada Logo
2:40 pm - 2:10 pm
STL
-
UVF
22h 30m
1 stop
Air Canada Logo
3:05 pm - 2:02 pm
UVF
-
STL
23h 57m
1 stop
$590Air Canada
Mon, Jul 13 - Tue, Jul 21
Air Canada Logo
8:55 am - 2:20 pm
STL
-
UVF
28h 25m
1 stop
Air Canada Logo
3:15 pm - 8:22 pm
UVF
-
STL
30h 07m
1 stop
$598Air Canada
Mon, Aug 24 - Fri, Aug 28
Air Canada Logo
2:40 pm - 2:10 pm
STL
-
UVF
22h 30m
1 stop
Air Canada Logo
3:05 pm - 2:02 pm
UVF
-
STL
23h 57m
1 stop
$620Air Canada
Mon, Jul 13 - Tue, Jul 21
Multiple Airlines Logo
8:55 am - 7:00 pm
STL
-
SLU
33h 05m
2 stops
Multiple Airlines Logo
12:35 pm - 3:30 pm
SLU
-
STL
27h 55m
2 stops
$942Multiple Airlines
Tue, Oct 20 - Wed, Oct 28
Multiple Airlines Logo
4:15 pm - 7:00 pm
STL
-
SLU
24h 45m
2 stops
Multiple Airlines Logo
12:35 pm - 3:30 pm
SLU
-
STL
28h 55m
2 stops
$985Multiple Airlines
Thu, Dec 3 - Mon, Dec 7

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Air Canada flights from St. Louis to Saint Lucia

Our best Air Canada deals on St. Louis to Saint Lucia flight tickets
Air Canada
Aug 10
STL2:40 pmLambert-St Louis
22h 40m
1 stop
UVF2:20 pmCastries Hewanorra
Aug 18
UVF3:15 pmCastries Hewanorra
23h 47m
1 stop
STL2:02 pmLambert-St Louis
$560
Air Canada
Aug 10
STL12:10 pmLambert-St Louis
25h 10m
2 stops
UVF2:20 pmCastries Hewanorra
Aug 18
UVF3:15 pmCastries Hewanorra
23h 47m
1 stop
STL2:02 pmLambert-St Louis
$563
Air Canada
Nov 4
STL4:15 pmLambert-St Louis
22h 10m
1 stop
UVF4:25 pmCastries Hewanorra
Nov 18
UVF5:25 pmCastries Hewanorra
24h 05m
1 stop
STL3:30 pmLambert-St Louis
$564

American Airlines flights from St. Louis to Saint Lucia

Our best American Airlines deals on St. Louis to Saint Lucia flight tickets
American Airlines
Aug 19
STL5:00 amLambert-St Louis
7h 49m
1 stop
UVF1:49 pmCastries Hewanorra
Aug 26
UVF2:49 pmCastries Hewanorra
8h 51m
1 stop
STL10:40 pmLambert-St Louis
$715
American Airlines
Sep 16
STL5:00 amLambert-St Louis
7h 54m
1 stop
UVF1:54 pmCastries Hewanorra
Sep 22
UVF3:02 pmCastries Hewanorra
20h 18m
2 stops
STL10:20 amLambert-St Louis
$720
American Airlines
Sep 16
STL5:00 amLambert-St Louis
7h 54m
1 stop
UVF1:54 pmCastries Hewanorra
Sep 22
UVF3:02 pmCastries Hewanorra
26h 13m
1 stop
STL4:15 pmLambert-St Louis
$729

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 June 11, 2026.
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

Cheapest round-trip

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/10

2:40 pm-2:20 pm

1 stop22h 40m

Castries Hewanorra

Tue 8/18

3:15 pm-2:02 pm

1 stop23h 47m

$560

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/10

12:10 pm-2:20 pm

2 stops25h 10m

Castries Hewanorra

Tue 8/18

3:15 pm-2:02 pm

1 stop23h 47m

$563
Quickest round-trip

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 11/4

4:15 pm-4:25 pm

1 stop22h 10m

Castries Hewanorra

Wed 11/18

5:25 pm-3:30 pm

1 stop24h 05m

$564

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/10

2:40 pm-2:20 pm

1 stop22h 40m

Castries Hewanorra

Tue 8/18

3:15 pm-2:02 pm

1 stop23h 47m

$574

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/10

12:10 pm-2:20 pm

2 stops25h 10m

Castries Hewanorra

Tue 8/18

3:15 pm-2:02 pm

1 stop23h 47m

$577

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 7/13

2:40 pm-2:10 pm

1 stop22h 30m

Castries Hewanorra

Tue 7/21

3:05 pm-2:02 pm

1 stop23h 57m

$590

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/24

8:55 am-2:20 pm

1 stop28h 25m

Castries Hewanorra

Fri 8/28

3:15 pm-8:22 pm

1 stop30h 07m

$598

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 7/13

2:40 pm-2:10 pm

1 stop22h 30m

Castries Hewanorra

Tue 7/21

3:05 pm-2:02 pm

1 stop23h 57m

$620

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Tue 10/20

8:55 am-7:00 pm

2 stops33h 05m

Castries George F. L. Charle

Wed 10/28

12:35 pm-3:30 pm

2 stops27h 55m

$942

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Thu 12/3

4:15 pm-7:00 pm

2 stops24h 45m

Castries George F. L. Charle

Mon 12/7

12:35 pm-3:30 pm

2 stops28h 55m

$985

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 month to fly to Saint Lucia?

The month of August is, on average, the cheapest month to fly to Saint Lucia from St. Louis, with most prices found around $505. If you aren’t able to travel to Saint Lucia during the month of August, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $565.

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 08m

Direct flights

None
The fastest flight from St. Louis to Saint Lucia takes 7h 08m
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

Frequently asked questions about flying from St. Louis to Saint Lucia

  • 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 $575Free CancellationRating
7.1
11,640 reviews
Search American Airlines flights
DeltaPriceFrom $600Free CancellationRating
7.9
8,399 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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