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Cheap flights from St. Louis to Castries from $552

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 Castries 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

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Find the cheapest flights from St. Louis to Castries

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 20m1 stop
Air Canada Logo
5:15 pm - 3:29 pm
UVF
-
STL
24h 14m1 stop
$552Air Canada
Sun, Feb 1 - Wed, Feb 11
Delta Logo
6:57 pm - 3:05 pm
STL
-
UVF
18h 08m1 stop
Delta Logo
4:25 pm - 11:37 pm
UVF
-
STL
9h 12m1 stop
$575Delta
Mon, Feb 2 - Wed, Feb 11
American Airlines Logo
5:05 am - 2:50 pm
STL
-
UVF
7h 45m1 stop
American Airlines Logo
4:25 pm - 9:43 am
UVF
-
STL
19h 18m1 stop
$600American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
3:54 pm - 4:02 pm
STL
-
UVF
22h 08m2 stops
American Airlines Logo
5:02 pm - 9:40 am
UVF
-
STL
18h 38m2 stops
$601American Airlines
Sat, Jan 24 - Fri, Jan 30
American Airlines Logo
6:58 pm - 4:00 pm
STL
-
UVF
19h 02m2 stops
American Airlines Logo
4:25 pm - 9:43 am
UVF
-
STL
19h 18m1 stop
$605American Airlines
Mon, Feb 16 - Mon, Feb 23
American Airlines Logo
5:07 pm - 1:46 pm
STL
-
UVF
18h 39m1 stop
American Airlines Logo
5:02 pm - 11:59 pm
UVF
-
STL
8h 57m1 stop
$608American Airlines
Sat, Jan 24 - Fri, Jan 30
American Airlines Logo
8:13 am - 3:03 pm
STL
-
UVF
28h 50m1 stop
American Airlines Logo
5:02 pm - 11:03 am
UVF
-
STL
20h 01m2 stops
$613American Airlines
Sat, Jan 31 - Sat, Feb 7
American Airlines Logo
5:54 pm - 1:45 pm
STL
-
UVF
18h 51m2 stops
American Airlines Logo
4:15 pm - 11:26 pm
UVF
-
STL
8h 11m1 stop
$617American Airlines
Wed, May 27 - Wed, Jun 3
American Airlines Logo
5:56 pm - 4:00 pm
STL
-
UVF
20h 04m2 stops
American Airlines Logo
5:00 pm - 12:31 pm
UVF
-
STL
21h 31m2 stops
$630American Airlines
Wed, Feb 18 - Mon, Feb 23
American Airlines Logo
5:56 pm - 3:25 pm
STL
-
UVF
19h 29m1 stop
American Airlines Logo
4:25 pm - 9:43 am
UVF
-
STL
19h 18m1 stop
$634American Airlines
Wed, Feb 18 - Mon, Feb 23

Air Canada flights from St. Louis to Castries

Our best Air Canada deals on St. Louis to Castries flight tickets
Air Canada
Feb 1
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF4:25 pmCastries Hewanorra
Feb 11
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$552
Find similar
Air Canada
Mar 29
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF3:25 pmCastries Hewanorra
Apr 3
UVF4:20 pmCastries Hewanorra
24h 04m
1 stop
STL3:24 pmLambert-St Louis
$723
Find similar
Air Canada
Feb 4
STL4:05 pmLambert-St Louis
22h 20m
1 stop
UVF4:25 pmCastries Hewanorra
Feb 11
UVF5:15 pmCastries Hewanorra
24h 14m
1 stop
STL3:29 pmLambert-St Louis
$765
Find similar

Delta flights from St. Louis to Castries

Our best Delta deals on St. Louis to Castries flight tickets
Delta
Feb 2
STL6:57 pmLambert-St Louis
18h 08m
1 stop
UVF3:05 pmCastries Hewanorra
Feb 11
UVF4:25 pmCastries Hewanorra
9h 12m
1 stop
STL11:37 pmLambert-St Louis
$575
Find similar
Delta
Jan 2
STL6:00 amLambert-St Louis
7h 30m
1 stop
UVF3:30 pmCastries Hewanorra
Jan 7
UVF4:25 pmCastries Hewanorra
9h 14m
1 stop
STL11:39 pmLambert-St Louis
$1,151
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Castries 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 December 9, 2025.
Use the filters below to find and compare flights from St. Louis to Castries 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

Wed 2/11

5:15 pm-3:29 pm

1 stop24h 14m

$552

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/2

6:57 pm-3:05 pm

1 stop18h 08m

Castries Hewanorra

Wed 2/11

4:25 pm-11:37 pm

1 stop9h 12m

$575

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

5:05 am-2:50 pm

1 stop7h 45m

Castries Hewanorra

Mon 2/23

4:25 pm-9:43 am

1 stop19h 18m

$600

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 1/24

3:54 pm-4:02 pm

2 stops22h 08m

Castries Hewanorra

Fri 1/30

5:02 pm-9:40 am

2 stops18h 38m

$601

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Mon 2/16

6:58 pm-4:00 pm

2 stops19h 02m

Castries Hewanorra

Mon 2/23

4:25 pm-9:43 am

1 stop19h 18m

$605

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 1/24

5:07 pm-1:46 pm

1 stop18h 39m

Castries Hewanorra

Fri 1/30

5:02 pm-11:59 pm

1 stop8h 57m

$608

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Sat 1/31

8:13 am-3:03 pm

1 stop28h 50m

Castries Hewanorra

Sat 2/7

5:02 pm-11:03 am

2 stops20h 01m

$613

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 5/27

5:54 pm-1:45 pm

2 stops18h 51m

Castries Hewanorra

Wed 6/3

4:15 pm-11:26 pm

1 stop8h 11m

$617

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 2/18

5:56 pm-4:00 pm

2 stops20h 04m

Castries Hewanorra

Mon 2/23

5:00 pm-12:31 pm

2 stops21h 31m

$630

St. LouisCastries

STL - UVF

STLUVF

Lambert-St Louis

Wed 2/18

5:56 pm-3:25 pm

1 stop19h 29m

Castries Hewanorra

Mon 2/23

4:25 pm-9:43 am

1 stop19h 18m

$634

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Castries from

How to get the cheapest flight ticket from St. Louis to Castries

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 Castries?

The month of October is, on average, the cheapest month to fly to Castries from St. Louis, with most prices found around $581. The month of January is another great option to travel to Castries, with average flight prices from St. Louis averaging around $600.

What is the cheapest day to depart on your flight to Castries?

The cheapest day to depart from St. Louis to Castries is on a Tuesday when prices can be found for as low as $614. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $816. These prices are subject to change though, so be sure to set up a Price Alert for flights to Castries.

What is the cheapest time of day to depart on your flight to Castries?

According to our data, the cheapest time of day to fly to Castries is in the afternoon. momondo users have found flights departing from St. Louis to Castries in the afternoon for as low as $658. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Castries are more costly in the morning, with an average ticket price of $761. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from St. Louis to Castries

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Castries according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Castries (STL to UVF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Castries

Fastest flight time

7h 05m

Direct flights

None
The fastest flight from St. Louis to Castries takes 7h 05m
There are no direct flights from St. Louis to Castries. There are no popular flight routes from St. Louis to Castries.
Search flight deals

  • How far is Lambert-St Louis to Castries Hewanorra by plane?

    The distance between Lambert-St Louis and Castries Hewanorra is about 2460.5 mi. A reasonable flight in good conditions will take 7h 05m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Castries Hewanorra Airport?

    Prices for flights from Lambert-St Louis Airport to Castries Hewanorra Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Castries Hewanorra Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Castries Hewanorra Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Castries Hewanorra Airport.

  • What documentation or ID do you need to fly to Castries Hewanorra Airport?

    The required travel and health documents for your Castries Hewanorra Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Castries Hewanorra Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from St. Louis to Castries?

Best airlines flying from St. Louis to Castries

Compare and see reviews for airlines that fly from St. Louis to Castries with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $565Free CancellationRating
7.9
8,011 reviews
Search Delta flights
American AirlinesPriceFrom $568Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights

Traveling to a place near Castries?

Book flights to Castries if you plan to visit one of these locations
Vieux Fort

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Castries?

It is quick and easy to find St. Louis to Castries flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Castries that suits you.

Can I find flights from St. Louis to Castries with flexible booking policies on momondo?

All flight searches from St. Louis to Castries on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Castries?

Once all potential St. Louis to Castries flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Castries right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Castries flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to Saint Lucia

Airports servicing Saint Lucia

Castries George F. L. Charle Airport