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Cheap flights from St. Louis to Saint Lucia from $627

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 8/24. 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 - 2:04 pm
UVF
-
STL
23h 49m
1 stop
$627Air Canada
Mon, Aug 24 - Fri, Aug 28
Air Canada Logo
12:10 pm - 2:20 pm
STL
-
UVF
25h 10m
2 stops
Air Canada Logo
3:15 pm - 2:04 pm
UVF
-
STL
23h 49m
1 stop
$630Air Canada
Mon, Aug 24 - Fri, Aug 28
Air Canada Logo
12:10 pm - 2:20 pm
STL
-
UVF
25h 10m
2 stops
Air Canada Logo
3:15 pm - 6:42 pm
UVF
-
STL
28h 27m
2 stops
$643Air Canada
Mon, Aug 24 - Fri, Aug 28
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
$654Air 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
$657Air Canada
Mon, Aug 10 - Tue, Aug 18
Delta Logo
6:00 am - 3:10 pm
STL
-
UVF
7h 10m
1 stop
Delta Logo
4:25 pm - 11:39 pm
UVF
-
STL
9h 14m
1 stop
$710Delta
Mon, Nov 23 - Fri, Dec 4
American Airlines Logo
5:02 am - 3:02 pm
STL
-
UVF
8h 00m
1 stop
American Airlines Logo
3:53 pm - 11:55 pm
UVF
-
STL
10h 02m
1 stop
$739American Airlines
Tue, Dec 15 - Tue, Dec 22
American Airlines Logo
5:02 am - 3:02 pm
STL
-
UVF
8h 00m
1 stop
American Airlines Logo
2:04 pm - 11:55 pm
UVF
-
STL
11h 51m
2 stops
$744American Airlines
Tue, Dec 15 - Tue, Dec 22
Multiple Airlines Logo
2:40 pm - 7:00 pm
STL
-
SLU
27h 20m
2 stops
Multiple Airlines Logo
12:35 pm - 2:00 pm
SLU
-
STL
26h 25m
2 stops
$952Multiple Airlines
Sun, Oct 11 - Wed, Oct 14
Multiple Airlines Logo
2:40 pm - 7:00 pm
STL
-
SLU
27h 20m
2 stops
Multiple Airlines Logo
3:45 pm - 2:04 pm
SLU
-
STL
47h 19m
2 stops
$1,194Multiple Airlines
Thu, Aug 13 - Thu, Aug 20

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American Airlines flights from St. Louis to Saint Lucia

Our best American Airlines deals on St. Louis to Saint Lucia flight tickets
American Airlines
Dec 15
STL5:02 amLambert-St Louis
8h 00m
1 stop
UVF3:02 pmCastries Hewanorra
Dec 22
UVF3:53 pmCastries Hewanorra
10h 02m
1 stop
STL11:55 pmLambert-St Louis
$739
American Airlines
Dec 15
STL5:02 amLambert-St Louis
8h 00m
1 stop
UVF3:02 pmCastries Hewanorra
Dec 22
UVF2:04 pmCastries Hewanorra
11h 51m
2 stops
STL11:55 pmLambert-St Louis
$744
American Airlines
Oct 30
STL5:00 amLambert-St Louis
9h 03m
1 stop
UVF3:03 pmCastries Hewanorra
Nov 6
UVF4:04 pmCastries Hewanorra
10h 01m
1 stop
STL12:05 amLambert-St Louis
$745

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 24
STL2:40 pmLambert-St Louis
22h 40m
1 stop
UVF2:20 pmCastries Hewanorra
Aug 28
UVF3:15 pmCastries Hewanorra
23h 49m
1 stop
STL2:04 pmLambert-St Louis
$627
Air Canada
Aug 24
STL12:10 pmLambert-St Louis
25h 10m
2 stops
UVF2:20 pmCastries Hewanorra
Aug 28
UVF3:15 pmCastries Hewanorra
23h 49m
1 stop
STL2:04 pmLambert-St Louis
$630
Air Canada
Aug 24
STL12:10 pmLambert-St Louis
25h 10m
2 stops
UVF2:20 pmCastries Hewanorra
Aug 28
UVF3:15 pmCastries Hewanorra
28h 27m
2 stops
STL6:42 pmLambert-St Louis
$643

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 July 2, 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 8/24

2:40 pm-2:20 pm

1 stop22h 40m

Castries Hewanorra

Fri 8/28

3:15 pm-2:04 pm

1 stop23h 49m

$627

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/24

12:10 pm-2:20 pm

2 stops25h 10m

Castries Hewanorra

Fri 8/28

3:15 pm-2:04 pm

1 stop23h 49m

$630

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 8/24

12:10 pm-2:20 pm

2 stops25h 10m

Castries Hewanorra

Fri 8/28

3:15 pm-6:42 pm

2 stops28h 27m

$643

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

$654

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

$657
Quickest round-trip

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 11/23

6:00 am-3:10 pm

1 stop7h 10m

Castries Hewanorra

Fri 12/4

4:25 pm-11:39 pm

1 stop9h 14m

$710

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 12/15

5:02 am-3:02 pm

1 stop8h 00m

Castries Hewanorra

Tue 12/22

3:53 pm-11:55 pm

1 stop10h 02m

$739

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 12/15

5:02 am-3:02 pm

1 stop8h 00m

Castries Hewanorra

Tue 12/22

2:04 pm-11:55 pm

2 stops11h 51m

$744

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Sun 10/11

2:40 pm-7:00 pm

2 stops27h 20m

Castries George F. L. Charle

Wed 10/14

12:35 pm-2:00 pm

2 stops26h 25m

$952

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Thu 8/13

2:40 pm-7:00 pm

2 stops27h 20m

Castries George F. L. Charle

Thu 8/20

3:45 pm-2:04 pm

2 stops47h 19m

$1,194

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 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 July is also cheap. Prices for this month can be found on momondo for an average of $573.

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 05m

Direct flights

None
The fastest flight from St. Louis to Saint Lucia takes 7h 05m
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
11,770 reviews
Search American Airlines flights
DeltaPriceFrom $600Free CancellationRating
7.8
8,452 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
Flights to Castriesfrom $550