Latest deals
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Saint Lucia from $595

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 2/1. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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 - 4:25 pm
STL
-
UVF
22h 20m
1 stop
Air Canada Logo
5:15 pm - 3:29 pm
UVF
-
STL
24h 14m
1 stop
$595Air Canada
Sun, Feb 1 - Thu, Feb 5
Air Canada Logo
4:05 pm - 3:25 pm
STL
-
UVF
21h 20m
1 stop
Air Canada Logo
4:15 pm - 3:29 pm
UVF
-
STL
24h 14m
1 stop
$619Air Canada
Sat, Mar 7 - Thu, Mar 12
American Airlines Logo
5:24 am - 1:35 pm
STL
-
UVF
7h 11m
1 stop
American Airlines Logo
2:35 pm - 10:16 am
UVF
-
STL
20h 41m
1 stop
$646American Airlines
Tue, May 12 - Mon, May 18
American Airlines Logo
3:24 pm - 1:35 pm
STL
-
UVF
21h 11m
2 stops
American Airlines Logo
2:35 pm - 10:16 am
UVF
-
STL
20h 41m
1 stop
$651American Airlines
Tue, May 12 - Mon, May 18
American Airlines Logo
5:23 am - 2:10 pm
STL
-
UVF
7h 47m
1 stop
American Airlines Logo
2:58 pm - 10:01 am
UVF
-
STL
20h 03m
2 stops
$655American Airlines
Tue, Jul 7 - Tue, Jul 14
American Airlines Logo
5:14 am - 3:58 pm
STL
-
UVF
8h 44m
1 stop
American Airlines Logo
4:58 pm - 11:01 am
UVF
-
STL
20h 03m
2 stops
$668American Airlines
Mon, Feb 16 - Mon, Feb 23
Air Canada Logo
4:05 pm - 3:25 pm
STL
-
UVF
21h 20m
1 stop
Air Canada Logo
4:15 pm - 3:29 pm
UVF
-
STL
24h 14m
1 stop
$669Air Canada
Sat, Mar 7 - Thu, Mar 12
American Airlines Logo
6:20 pm - 2:58 pm
STL
-
UVF
18h 38m
1 stop
American Airlines Logo
3:58 pm - 9:06 am
UVF
-
STL
18h 08m
2 stops
$674American Airlines
Sat, Mar 7 - Thu, Mar 12
American Airlines Logo
5:14 am - 2:48 pm
STL
-
UVF
7h 34m
1 stop
American Airlines Logo
4:58 pm - 10:32 am
UVF
-
STL
19h 34m
1 stop
$677American Airlines
Mon, Feb 16 - Mon, Feb 23
Multiple Airlines Logo
7:30 am - 9:30 am
STL
-
SLU
25h 00m
2 stops
Multiple Airlines Logo
7:10 pm - 12:06 pm
SLU
-
STL
41h 56m
2 stops
$3,655Multiple Airlines
Tue, May 12 - Mon, May 18

American Airlines flights from St. Louis to Saint Lucia

Our best American Airlines deals on St. Louis to Saint Lucia flight tickets
American Airlines
May 12
STL5:24 amLambert-St Louis
7h 11m
1 stop
UVF1:35 pmCastries Hewanorra
May 18
UVF2:35 pmCastries Hewanorra
20h 41m
1 stop
STL10:16 amLambert-St Louis
$646
American Airlines
May 12
STL3:24 pmLambert-St Louis
21h 11m
2 stops
UVF1:35 pmCastries Hewanorra
May 18
UVF2:35 pmCastries Hewanorra
20h 41m
1 stop
STL10:16 amLambert-St Louis
$651
American Airlines
Jul 7
STL5:23 amLambert-St Louis
7h 47m
1 stop
UVF2:10 pmCastries Hewanorra
Jul 14
UVF2:58 pmCastries Hewanorra
20h 03m
2 stops
STL10:01 amLambert-St Louis
$655

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 24
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF4:25 pmCastries Hewanorra
Jan 26
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$529
Air Canada
Feb 1
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF4:25 pmCastries Hewanorra
Feb 5
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$595
Air Canada
Mar 7
STL4:05 pmLambert-St Louis
21h 20m
1 stop
UVF3:25 pmCastries Hewanorra
Mar 12
UVF4:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$619

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 January 22, 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

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sun 2/1

4:05 pm-4:25 pm

1 stop22h 20m

Castries Hewanorra

Thu 2/5

5:15 pm-3:29 pm

1 stop24h 14m

$595

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 3/7

4:05 pm-3:25 pm

1 stop21h 20m

Castries Hewanorra

Thu 3/12

4:15 pm-3:29 pm

1 stop24h 14m

$619

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 5/12

5:24 am-1:35 pm

1 stop7h 11m

Castries Hewanorra

Mon 5/18

2:35 pm-10:16 am

1 stop20h 41m

$646

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 5/12

3:24 pm-1:35 pm

2 stops21h 11m

Castries Hewanorra

Mon 5/18

2:35 pm-10:16 am

1 stop20h 41m

$651

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Tue 7/7

5:23 am-2:10 pm

1 stop7h 47m

Castries Hewanorra

Tue 7/14

2:58 pm-10:01 am

2 stops20h 03m

$655

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

5:14 am-3:58 pm

1 stop8h 44m

Castries Hewanorra

Mon 2/23

4:58 pm-11:01 am

2 stops20h 03m

$668

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 3/7

4:05 pm-3:25 pm

1 stop21h 20m

Castries Hewanorra

Thu 3/12

4:15 pm-3:29 pm

1 stop24h 14m

$669

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 3/7

6:20 pm-2:58 pm

1 stop18h 38m

Castries Hewanorra

Thu 3/12

3:58 pm-9:06 am

2 stops18h 08m

$674

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

5:14 am-2:48 pm

1 stop7h 34m

Castries Hewanorra

Mon 2/23

4:58 pm-10:32 am

1 stop19h 34m

$677

St. LouisCastries

STL - SLU

STLSLU

Lambert-St Louis

Tue 5/12

7:30 am-9:30 am

2 stops25h 00m

Castries George F. L. Charle

Mon 5/18

7:10 pm-12:06 pm

2 stops41h 56m

$3,655

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

  • 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
11,174 reviews
Search American Airlines flights
DeltaPriceFrom $570Free CancellationRating
7.9
8,087 reviews
Search Delta flights

  • How do I get Price Alerts for flights from St. Louis to Saint Lucia?

    Price Alerts will notify you by email when the price for flights to Saint Lucia from St. Louis decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from St. Louis to Saint Lucia with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

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.

An easier way to manage your Saint Lucia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 2/21
Sat 2/28
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Saint Lucia

Popular cities in Saint Lucia

Popular flights according to clicks in the last 7 days on momondo
Flights to Castriesfrom $455