$104 Cheap Flights from St. Louis (STL) to Harlingen (HRL)

View $104 flight on Thu, Dec 11, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Valley Intl. Airport (HRL)

Cheap Flights from St. Louis to Harlingen (STL-HRL)

Prices were available within the past 7 days and start at $104 for one-way flights and $207 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$207 Roundtrip, found 1 day ago
$207
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $207 found 1 day ago
United
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$207 Roundtrip, found 1 day ago
$207
Roundtrip
found 1 day ago
Select United flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $207 found 1 day ago
Southwest Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$207 Roundtrip, found 1 day ago
$207
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $207 found 1 day ago
American Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$210 Roundtrip, found 1 day ago
$210
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $210 found 1 day ago
Southwest Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$212 Roundtrip, found 1 day ago
$212
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $212 found 1 day ago
Delta
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$215 Roundtrip, found 1 day ago
$215
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $215 found 1 day ago
Delta
Thu, Dec 11 - Fri, Dec 12
STL
St. Louis
HRL
Harlingen
$228 Roundtrip, found 1 day ago
$228
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Fri, Dec 12, priced at $228 found 1 day ago
American Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
HRL
Harlingen
$231 Roundtrip, found 1 day ago
$231
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Dec 11 from St. Louis to Harlingen, returning Mon, Dec 15, priced at $231 found 1 day ago
American Airlines
Thu, Jan 8 - Sun, Jan 11
STL
St. Louis
HRL
Harlingen
$235 Roundtrip, found 2 days ago
$235
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Jan 8 from St. Louis to Harlingen, returning Sun, Jan 11, priced at $235 found 2 days ago
American Airlines
Mon, Jan 5 - Sat, Jan 10
STL
St. Louis
HRL
Harlingen
$238 Roundtrip, found 12 hours ago
$238
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Mon, Jan 5 from St. Louis to Harlingen, returning Sat, Jan 10, priced at $238 found 12 hours ago

Find the cheapest month to fly from St. Louis (STL) to Harlingen (HRL)

October is typically the cheapest month to fly

From $175 - $396 per traveler.

Alternative airports near Harlingen

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

Select flight to Brownsville-South Padre Island Intl. BRO. Average driving time to city center is 33 minutes. Flights from $354
BRO
Brownsville-South Padre Island Intl.
Average driving time to city center33 min
Flights from $354

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL) cost?
Snag a cheap one-way flight from $104 or cheap return flight from $207 from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?
Planning your trip for December may help you find better deals, as it's the cheapest month for flights between STL and HRL. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest STL to HRL flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?
There are no daily direct flights available from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL). But you can choose flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way before you know it.
What day of the week has the most flights from STL to HRL?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*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 Valley Intl. Airport (HRL)?
To land at Valley Intl. Airport (HRL) on schedule, pick a flight that takes off from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Valley Intl. Airport (HRL) last-minute?
Last-minute fares from STL to HRL are usually more expensive. To lock in the lowest prices, start looking for flights ahead of time. That said, if you're flexible with your travel plans, it's possible to score a cheap fare right before your trip.
Is it cheaper to book a STL to HRL flight and hotel package?
Booking a STL to HRL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our impressive range of hotels and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?
Typically, it's possible to reschedule or cancel your STL to HRL flight. However, for bookings made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Valley Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$206
Distance
962 mi

Book with confidence

St. Louis to Harlingen Flights

The cheapest times to fly from St. Louis to Harlingen

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 Harlingen are during the month of December. You can find some of the cheapest flights from St. Louis to Harlingen with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Harlingen

Sunday is one of the best days to book for cheap flights from St. Louis to Harlingen: 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 Harlingen

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 Harlingen in 2025. You can also book with separate airlines for your outbound and return journeys, from $104 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 Harlingen 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 Harlingen 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 Harlingen Flights

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*Available to One Key members.