$243 Cheap Flights from St. Louis (STL) to Port of Spain (POS)

View $243 flight on Thu, Feb 19, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $243 for one-way flights and $533 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Sun, Aug 31 - Sat, Sep 6
STL
St. Louis
POS
Trinidad
$533 Roundtrip, found 1 day ago
$533
Roundtrip
found 1 day ago
Select Air Canada flight, departing Sun, Aug 31 from St. Louis to Trinidad, returning Sat, Sep 6, priced at $533 found 1 day ago
Air Canada
Sun, Sep 7 - Mon, Sep 22
STL
St. Louis
POS
Trinidad
$550 Roundtrip, found 3 days ago
$550
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Sep 7 from St. Louis to Trinidad, returning Mon, Sep 22, priced at $550 found 3 days ago
American Airlines
Thu, Nov 27 - Thu, Dec 11
STL
St. Louis
POS
Trinidad
$558 Roundtrip, found 1 day ago
$558
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Nov 27 from St. Louis to Trinidad, returning Thu, Dec 11, priced at $558 found 1 day ago
United
Thu, Nov 27 - Thu, Dec 11
STL
St. Louis
POS
Trinidad
$558 Roundtrip, found 1 day ago
$558
Roundtrip
found 1 day ago
Select United flight, departing Thu, Nov 27 from St. Louis to Trinidad, returning Thu, Dec 11, priced at $558 found 1 day ago
American Airlines
Wed, Feb 18 - Wed, Feb 25
STL
St. Louis
POS
Trinidad
$563 Roundtrip, found 10 hours ago
$563
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Wed, Feb 18 from St. Louis to Trinidad, returning Wed, Feb 25, priced at $563 found 10 hours ago
American Airlines
Fri, Nov 14 - Tue, Nov 18
STL
St. Louis
POS
Trinidad
$570 Roundtrip, found 2 days ago
$570
Roundtrip
found 2 days ago
Select American Airlines flight, departing Fri, Nov 14 from St. Louis to Trinidad, returning Tue, Nov 18, priced at $570 found 2 days ago
American Airlines
Wed, Feb 18 - Wed, Feb 25
STL
St. Louis
POS
Trinidad
$571 Roundtrip, found 10 hours ago
$571
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Wed, Feb 18 from St. Louis to Trinidad, returning Wed, Feb 25, priced at $571 found 10 hours ago
Air Canada
Thu, Mar 5 - Mon, Mar 9
STL
St. Louis
POS
Trinidad
$573 Roundtrip, found 3 days ago
$573
Roundtrip
found 3 days ago
Select Air Canada flight, departing Thu, Mar 5 from St. Louis to Trinidad, returning Mon, Mar 9, priced at $573 found 3 days ago
American Airlines
Wed, Feb 18 - Wed, Feb 25
STL
St. Louis
POS
Trinidad
$575 Roundtrip, found 10 hours ago
$575
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Wed, Feb 18 from St. Louis to Trinidad, returning Wed, Feb 25, priced at $575 found 10 hours ago
Copa
Tue, Feb 3 - Fri, Feb 20
STL
St. Louis
POS
Trinidad
$1,187 Roundtrip, found 3 days ago
$1,187
Roundtrip
found 3 days ago
Select Copa flight, departing Tue, Feb 3 from St. Louis to Trinidad, returning Fri, Feb 20, priced at $1,187 found 3 days ago

Alternative airports near Piarco

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Piarco Intl. POS. Cheapest option available. Flights from $713
POS
Piarco Intl.
Cheapest
Flights from $713
Flights from St. Louis (STL) to Port of Spain (POS)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Piarco Intl.
Airlines serving
Air Canada, American Airlines, Copa, United
Roundtrip price
$532
Distance
2641 mi

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 August. 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 $243 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.

 

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 $243 or cheap return flight from $533 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 August 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.

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*Available to One Key members.