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Cheap flights from St. Louis to Saint Lucia from $311

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 9/30. 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
4:05 pm - 3:40 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
22h 35m1 stop Toronto Pearson Intl
Air Canada Logo
4:40 pm - 3:26 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 46m1 stop Toronto Pearson Intl
$412Air Canada
Sun, Oct 25 - Thu, Oct 29
Air Canada Logo
4:05 pm - 3:40 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
22h 35m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 pm - 3:26 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 46m1 stop Toronto Pearson Intl
$439Air Canada
Thu, Oct 29 - Fri, Nov 6
Air Canada Logo
4:05 pm - 3:40 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
22h 35m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 pm - 3:26 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 46m1 stop Toronto Pearson Intl
$447Air Canada
Thu, Oct 29 - Fri, Nov 6
Air Canada Logo
8:55 am - 3:40 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
29h 45m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 pm - 3:26 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 46m1 stop Toronto Pearson Intl
$460Air Canada
Sat, Oct 24 - Sun, Nov 1
American Airlines Logo
5:00 am - 1:42 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
7h 42m1 stop Miami
American Airlines Logo
3:20 pm - 11:59 pmUVF  Castries Hewanorra-STL Lambert-St Louis
9h 39m1 stop Charlotte Douglas
$730American Airlines
Sun, Oct 25 - Thu, Oct 29
Delta Logo
7:20 pm - 2:12 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
17h 52m1 stop Atlanta Hartsfield-Jackson
Delta Logo
3:32 pm - 11:54 pmUVF  Castries Hewanorra-STL Lambert-St Louis
9h 22m1 stop Atlanta Hartsfield-Jackson
$730Delta
Tue, Oct 27 - Thu, Oct 29
Delta Logo
7:20 pm - 2:12 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
17h 52m1 stop Atlanta Hartsfield-Jackson
Delta Logo
3:32 pm - 9:09 amUVF  Castries Hewanorra-STL Lambert-St Louis
18h 37m1 stop Atlanta Hartsfield-Jackson
$730Delta
Mon, Oct 26 - Wed, Oct 28
Delta Logo
6:00 am - 2:12 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
7h 12m1 stop Atlanta Hartsfield-Jackson
Delta Logo
3:32 pm - 11:54 pmUVF  Castries Hewanorra-STL Lambert-St Louis
9h 22m1 stop Atlanta Hartsfield-Jackson
$730Delta
Wed, Oct 28 - Thu, Oct 29
American Airlines Logo
2:54 pm - 1:47 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
20h 53m2 stops Dallas/Fort Worth Miami
American Airlines Logo
5:02 pm - 10:51 amUVF  Castries Hewanorra-STL Lambert-St Louis
19h 49m2 stops Miami Chicago O'Hare Intl
$735American Airlines
Sun, Jan 24 - Fri, Jan 29
American Airlines Logo
4:57 pm - 1:47 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
18h 50m2 stops Dallas/Fort Worth Miami
American Airlines Logo
2:56 pm - 11:59 pmUVF  Castries Hewanorra-STL Lambert-St Louis
11h 03m1 stop Miami
$735American Airlines
Sun, Jan 24 - Fri, Jan 29

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Delta flights from St. Louis to Saint Lucia

Our best Delta deals on St. Louis to Saint Lucia flight tickets
Delta
Sep 30
STL6:00 amLambert-St Louis
7h 12m
1 stop
UVF2:12 pmCastries Hewanorra
Oct 6
UVF3:32 pmCastries Hewanorra
9h 22m
1 stop
STL11:54 pmLambert-St Louis
$730
Delta
Oct 23
STL7:20 pmLambert-St Louis
17h 52m
1 stop
UVF2:12 pmCastries Hewanorra
Nov 1
UVF4:32 pmCastries Hewanorra
9h 22m
1 stop
STL11:54 pmLambert-St Louis
$800
Delta
Aug 18
STL6:00 amLambert-St Louis
7h 14m
1 stop
UVF2:14 pmCastries Hewanorra
Aug 25
UVF3:34 pmCastries Hewanorra
8h 47m
1 stop
STL11:21 pmLambert-St Louis
$1,010

Air Canada flights from St. Louis to Saint Lucia

Our best Air Canada deals on St. Louis to Saint Lucia flight tickets
Air Canada
Oct 25
STL4:05 pmLambert-St Louis
22h 35m
1 stop
UVF3:40 pmCastries Hewanorra
Oct 29
UVF4:40 pmCastries Hewanorra
23h 46m
1 stop
STL3:26 pmLambert-St Louis
$412
Air Canada
Oct 29
STL4:05 pmLambert-St Louis
22h 35m
1 stop
UVF3:40 pmCastries Hewanorra
Nov 6
UVF5:40 pmCastries Hewanorra
23h 46m
1 stop
STL3:26 pmLambert-St Louis
$439
Air Canada
Oct 29
STL4:05 pmLambert-St Louis
22h 35m
1 stop
UVF3:40 pmCastries Hewanorra
Nov 6
UVF5:40 pmCastries Hewanorra
23h 46m
1 stop
STL3:26 pmLambert-St Louis
$447

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 August 12, 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 Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sun 10/25

4:05 pm-3:40 pm

1 stop22h 35m

Castries Hewanorra

Thu 10/29

4:40 pm-3:26 pm

1 stop23h 46m

$412

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Thu 10/29

4:05 pm-3:40 pm

1 stop22h 35m

Castries Hewanorra

Fri 11/6

5:40 pm-3:26 pm

1 stop23h 46m

$439

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Thu 10/29

4:05 pm-3:40 pm

1 stop22h 35m

Castries Hewanorra

Fri 11/6

5:40 pm-3:26 pm

1 stop23h 46m

$447

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sat 10/24

8:55 am-3:40 pm

1 stop29h 45m

Castries Hewanorra

Sun 11/1

5:40 pm-3:26 pm

1 stop23h 46m

$460

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sun 10/25

5:00 am-1:42 pm

1 stop7h 42m

Castries Hewanorra

Thu 10/29

3:20 pm-11:59 pm

1 stop9h 39m

$730

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Tue 10/27

7:20 pm-2:12 pm

1 stop17h 52m

Castries Hewanorra

Thu 10/29

3:32 pm-11:54 pm

1 stop9h 22m

$730

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Mon 10/26

7:20 pm-2:12 pm

1 stop17h 52m

Castries Hewanorra

Wed 10/28

3:32 pm-9:09 am

1 stop18h 37m

$730
Quickest round-trip

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Wed 10/28

6:00 am-2:12 pm

1 stop7h 12m

Castries Hewanorra

Thu 10/29

3:32 pm-11:54 pm

1 stop9h 22m

$730

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sun 1/24

2:54 pm-1:47 pm

2 stops20h 53m

Castries Hewanorra

Fri 1/29

5:02 pm-10:51 am

2 stops19h 49m

$735

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sun 1/24

4:57 pm-1:47 pm

2 stops18h 50m

Castries Hewanorra

Fri 1/29

2:56 pm-11:59 pm

1 stop11h 03m

$735

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 July is, on average, the cheapest month to fly to Saint Lucia from St. Louis, with most prices found around $573. If you aren’t able to travel to Saint Lucia during the month of July, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $600.

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 10m

Direct flights

None
The fastest flight from St. Louis to Saint Lucia takes 7h 10m
There are no direct flights from St. Louis to Saint Lucia. There are no popular flight routes from St. Louis to Saint Lucia.
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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
11,902 reviews
Search American Airlines flights
DeltaPriceFrom $600Free CancellationRating
7.8
8,505 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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