$198 Cheap Flights from St. Louis (STL) to Port of Spain (POS)

View $198 flight on Sat, Nov 22, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Piarco Intl. Airport (POS)

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Cheap Flights from St. Louis to Port of Spain (STL-POS)

Prices were available within the past 7 days and start at $198 for one-way flights and $443 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Sat, Nov 1 - Sat, Nov 8
STL
St. Louis
POS
Trinidad
$443 Roundtrip, found 4 days ago
$443
Roundtrip
found 4 days ago
Select Air Canada flight, departing Sat, Nov 1 from St. Louis to Trinidad, returning Sat, Nov 8, priced at $443 found 4 days ago
Air Canada
Thu, Nov 27 - Sat, Dec 6
STL
St. Louis
POS
Trinidad
$493 Roundtrip, found 4 days ago
$493
Roundtrip
found 4 days ago
Select Air Canada flight, departing Thu, Nov 27 from St. Louis to Trinidad, returning Sat, Dec 6, priced at $493 found 4 days ago
Air Canada
Sat, Mar 7 - Fri, Mar 13
STL
St. Louis
POS
Trinidad
$493 Roundtrip, found 2 days ago
$493
Roundtrip
found 2 days ago
Select Air Canada flight, departing Sat, Mar 7 from St. Louis to Trinidad, returning Fri, Mar 13, priced at $493 found 2 days ago
Air Canada
Sat, Nov 1 - Sat, Nov 8
STL
St. Louis
POS
Trinidad
$508 Roundtrip, found 4 days ago
$508
Roundtrip
found 4 days ago
Select Air Canada flight, departing Sat, Nov 1 from St. Louis to Trinidad, returning Sat, Nov 8, priced at $508 found 4 days ago
Air Canada
Sat, Mar 7 - Fri, Mar 13
STL
St. Louis
POS
Trinidad
$533 Roundtrip, found 2 days ago
$533
Roundtrip
found 2 days ago
Select Air Canada flight, departing Sat, Mar 7 from St. Louis to Trinidad, returning Fri, Mar 13, priced at $533 found 2 days ago
Air Canada
Mon, Apr 6 - Wed, Apr 22
STL
St. Louis
POS
Trinidad
$543 Roundtrip, found 5 days ago
$543
Roundtrip
found 5 days ago
Select Air Canada flight, departing Mon, Apr 6 from St. Louis to Trinidad, returning Wed, Apr 22, priced at $543 found 5 days ago
American Airlines
Tue, Nov 25 - Wed, Dec 3
STL
St. Louis
POS
Trinidad
$548 Roundtrip, found 4 days ago
$548
Roundtrip
found 4 days ago
Select American Airlines flight, departing Tue, Nov 25 from St. Louis to Trinidad, returning Wed, Dec 3, priced at $548 found 4 days ago
American Airlines
Wed, Nov 5 - Tue, Nov 25
STL
St. Louis
POS
Trinidad
$552 Roundtrip, found 4 days ago
$552
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Nov 5 from St. Louis to Trinidad, returning Tue, Nov 25, priced at $552 found 4 days ago
United
Tue, Nov 25 - Wed, Dec 3
STL
St. Louis
POS
Trinidad
$559 Roundtrip, found 4 days ago
$559
Roundtrip
found 4 days ago
Select United flight, departing Tue, Nov 25 from St. Louis to Trinidad, returning Wed, Dec 3, priced at $559 found 4 days ago
Copa
Sat, Mar 7 - Fri, Mar 13
STL
St. Louis
POS
Trinidad
$1,572 Roundtrip, found 2 days ago
$1,572
Roundtrip
found 2 days ago
Select Copa flight, departing Sat, Mar 7 from St. Louis to Trinidad, returning Fri, Mar 13, priced at $1,572 found 2 days ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS) cost?
Grab a cheap one-way flight from $198 or cheap return flight from $443 from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS)?
Planning your trip for November is a great way to save, as it's the cheapest month for flights between STL and POS. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from STL to POS. Then, sort your results by "Price (lowest to highest)" to score a good deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS)?
There are no daily direct flights departing from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS). But you can choose flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from STL to POS?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* However, this can change based on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS)?
Opt for a flight from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Departures after this hour are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS) last-minute?
Booking your plane ticket from STL to POS shortly before your trip is typically more expensive. But if you're flexible with your itinerary, you could land a cheap last-minute fare.
Is it cheaper to book a STL to POS flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to POS flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place will take the hassle out of travel planning. Just secure your flights and select from our wide range of stays, then personalize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Piarco Intl. Airport (POS)?
Usually, it's possible to cancel or reschedule your STL to POS flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Piarco Intl.
Airlines serving
Air Canada, American Airlines, Copa, United
Roundtrip price
$442
Distance
2641 mi

Book with confidence

Book with confidence

St. Louis to Port of Spain Flights

The cheapest times to fly from St. Louis to Port of Spain

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Port of Spain are during the month of November. You can find some of the cheapest flights from St. Louis to Port of Spain with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Port of Spain

Sunday is one of the best days to book for cheap flights from St. Louis to Port of Spain: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Port of Spain

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Port of Spain in 2025. You can also book with separate airlines for your outbound and return journeys, from $198 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Port of Spain flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Port of Spain airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Port of Spain Flights

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Explore a world of travel with Expedia

*Available to One Key members.