Cheap flights from St. Louis to Saint Lucia from $343
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 11/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly from
Fly to
Route
Depart
Return
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Mon 11/23
6:00 am-3:05 pm
1 stop7h 05m
Castries Hewanorra
Fri 12/4
4:26 pm-12:05 am
1 stop9h 39m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Mon 11/23
6:00 am-3:05 pm
1 stop7h 05m
Castries Hewanorra
Fri 12/4
4:26 pm-12:05 am
1 stop9h 39m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Thu 1/21
5:00 am-3:38 pm
1 stop8h 38m
Castries Hewanorra
Tue 1/26
3:46 pm-10:42 pm
1 stop8h 56m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Thu 11/19
5:00 am-3:27 pm
1 stop8h 27m
Castries Hewanorra
Thu 11/26
2:38 pm-9:50 pm
1 stop9h 12m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Mon 11/23
6:00 am-3:05 pm
1 stop7h 05m
Castries Hewanorra
Fri 12/4
4:26 pm-12:05 am
1 stop9h 39m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Thu 1/21
3:45 pm-2:46 pm
2 stops21h 01m
Castries Hewanorra
Tue 1/26
3:46 pm-10:42 pm
1 stop8h 56m
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
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Sun 1/3
7:18 am-2:15 pm
2 stops28h 57m
Castries Hewanorra
Sat 1/9
5:17 pm-9:50 am
1 stop18h 33m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Sun 1/3
7:18 am-2:15 pm
2 stops28h 57m
Castries Hewanorra
Sat 1/9
5:17 pm-9:37 pm
2 stops30h 20m
St. LouisCastries
STL Lambert-St Louis - UVF Castries Hewanorra
STLUVF
Lambert-St Louis
Sun 1/3
6:03 am-2:15 pm
1 stop30h 12m
Castries Hewanorra
Sat 1/9
5:17 pm-9:50 am
1 stop18h 33m
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How to get the cheapest flight ticket from St. Louis to Saint Lucia
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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
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?
As of October 2026, there are 2 operators available to choose from 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 | ||
|---|---|---|---|---|---|
| PriceFrom $620 | Free Cancellation | Rating 7.8 8,646 reviews | |||
| PriceFrom $713 | Free Cancellation | Rating 7.0 12,146 reviews |
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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.