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Cheap flights from St. Louis to Saint Lucia from $436

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 8/31. 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
8:55 am - 2:20 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
28h 25m1 stop Toronto Pearson Intl
Air Canada Logo
3:10 pm - 2:00 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 50m1 stop Toronto Pearson Intl
$436Air Canada
Mon, Aug 31 - Fri, Sep 11
Air Canada Logo
12:10 pm - 2:20 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
25h 10m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Air Canada Logo
3:10 pm - 2:00 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 50m1 stop Toronto Pearson Intl
$439Air Canada
Mon, Aug 31 - Fri, Sep 11
Air Canada Logo
12:10 pm - 2:20 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
49h 10m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Air Canada Logo
3:10 pm - 2:00 pmUVF  Castries Hewanorra-STL Lambert-St Louis
23h 50m1 stop Toronto Pearson Intl
$439Air Canada
Sun, Aug 30 - Fri, Sep 11
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
$478Air Canada
Thu, Oct 29 - Fri, Nov 6
American Airlines Logo
5:00 am - 3:03 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
9h 03m1 stop Miami
American Airlines Logo
3:10 pm - 11:59 pmUVF  Castries Hewanorra-STL Lambert-St Louis
9h 49m1 stop Charlotte Douglas
$730American Airlines
Mon, Oct 26 - Thu, Oct 29
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, Sep 30 - Tue, Oct 6
American Airlines Logo
5:00 am - 3:03 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
9h 03m1 stop Miami
American Airlines Logo
4:04 pm - 8:37 amUVF  Castries Hewanorra-STL Lambert-St Louis
17h 33m2 stops Miami Charlotte Douglas
$735American Airlines
Mon, Oct 26 - Thu, Oct 29
American Airlines Logo
1:25 pm - 2:02 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
23h 37m2 stops Philadelphia Miami
American Airlines Logo
3:02 pm - 10:15 amUVF  Castries Hewanorra-STL Lambert-St Louis
20h 13m2 stops Miami Washington, D.C. Reagan-National
$735American Airlines
Sat, Sep 26 - Wed, Sep 30
Delta Logo
6:00 am - 3:05 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
7h 05m1 stop Atlanta Hartsfield-Jackson
Delta Logo
4:25 pm - 11:39 pmUVF  Castries Hewanorra-STL Lambert-St Louis
9h 14m1 stop Atlanta Hartsfield-Jackson
$765Delta
Thu, Jan 7 - Tue, Jan 12
Delta Logo
6:00 am - 2:12 pmSTL  Lambert-St Louis-UVF Castries Hewanorra
7h 12m1 stop Atlanta Hartsfield-Jackson
Delta Logo
4:32 pm - 11:54 pmUVF  Castries Hewanorra-STL Lambert-St Louis
9h 22m1 stop Atlanta Hartsfield-Jackson
$765Delta
Fri, Oct 30 - Fri, Nov 6

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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 31
STL8:55 amLambert-St Louis
28h 25m
1 stop
UVF2:20 pmCastries Hewanorra
Sep 11
UVF3:10 pmCastries Hewanorra
23h 50m
1 stop
STL2:00 pmLambert-St Louis
$436
Air Canada
Aug 30
STL12:10 pmLambert-St Louis
49h 10m
2 stops
UVF2:20 pmCastries Hewanorra
Sep 11
UVF3:10 pmCastries Hewanorra
23h 50m
1 stop
STL2:00 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
$478

American Airlines flights from St. Louis to Saint Lucia

Our best American Airlines deals on St. Louis to Saint Lucia flight tickets
American Airlines
Sep 26
STL1:25 pmLambert-St Louis
23h 37m
2 stops
UVF2:02 pmCastries Hewanorra
Sep 30
UVF3:02 pmCastries Hewanorra
20h 13m
2 stops
STL10:15 amLambert-St Louis
$735
American Airlines
Sep 30
STL5:00 amLambert-St Louis
8h 02m
1 stop
UVF2:02 pmCastries Hewanorra
Oct 6
UVF4:04 pmCastries Hewanorra
19h 46m
2 stops
STL10:50 amLambert-St Louis
$740
American Airlines
Sep 26
STL5:10 pmLambert-St Louis
19h 52m
1 stop
UVF2:02 pmCastries Hewanorra
Sep 30
UVF3:02 pmCastries Hewanorra
19h 22m
2 stops
STL9:24 amLambert-St Louis
$749

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 6, 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

Mon 8/31

8:55 am-2:20 pm

1 stop28h 25m

Castries Hewanorra

Fri 9/11

3:10 pm-2:00 pm

1 stop23h 50m

$436

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Mon 8/31

12:10 pm-2:20 pm

2 stops25h 10m

Castries Hewanorra

Fri 9/11

3:10 pm-2:00 pm

1 stop23h 50m

$439

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sun 8/30

12:10 pm-2:20 pm

2 stops49h 10m

Castries Hewanorra

Fri 9/11

3:10 pm-2:00 pm

1 stop23h 50m

$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

$478

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Mon 10/26

5:00 am-3:03 pm

1 stop9h 03m

Castries Hewanorra

Thu 10/29

3:10 pm-11:59 pm

1 stop9h 49m

$730

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Wed 9/30

6:00 am-2:12 pm

1 stop7h 12m

Castries Hewanorra

Tue 10/6

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

5:00 am-3:03 pm

1 stop9h 03m

Castries Hewanorra

Thu 10/29

4:04 pm-8:37 am

2 stops17h 33m

$735

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Sat 9/26

1:25 pm-2:02 pm

2 stops23h 37m

Castries Hewanorra

Wed 9/30

3:02 pm-10:15 am

2 stops20h 13m

$735
Quickest round-trip

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Thu 1/7

6:00 am-3:05 pm

1 stop7h 05m

Castries Hewanorra

Tue 1/12

4:25 pm-11:39 pm

1 stop9h 14m

$765

St. LouisCastries

STL Lambert-St Louis - UVF Castries Hewanorra

STLUVF

Lambert-St Louis

Fri 10/30

6:00 am-2:12 pm

1 stop7h 12m

Castries Hewanorra

Fri 11/6

4:32 pm-11:54 pm

1 stop9h 22m

$765

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 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.
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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
11,864 reviews
Search American Airlines flights
DeltaPriceFrom $600Free CancellationRating
7.8
8,491 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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