$245+ Cheap flights from St. Louis to Harlingen, TX (STL - HRL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HRL
Mar 13 — Mar 201
1 adult, Economy
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Find cheap flights from St. Louis to Harlingen with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Harlingen
Cheapest
Best
Last-minute
Cheapest flights from St. Louis to HarlingenExplore the most affordable flight options available from St. Louis to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.
Explore the most affordable flight options available from St. Louis to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 11, 2026.
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:12 am
STL
- HRL
1 stop5h 00m
American Airlines
Wed 3/46:00 am
HRL
- STL
1 stop5h 01m
American Airlines
Deal found 2/10![American Airlines logo]()
$245
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:12 am
STL
- HRL
1 stop5h 00m
American Airlines
Wed 2/256:46 pm
HRL
- STL
1 stop4h 36m
American Airlines
Deal found 2/10![American Airlines logo]()
$268
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/266:30 pm
STL
- HRL
1 stop5h 35m
Southwest
Mon 3/306:25 pm
HRL
- STL
1 stop5h 40m
Southwest
Deal found 2/10![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/249:55 am
STL
- HRL
2 stops12h 04m
United Airlines
Sat 2/285:22 pm
HRL
- STL
1 stop4h 52m
United Airlines
Deal found 2/9![United Airlines logo]()
$280
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1811:55 am
STL
- HRL
1 stop5h 10m
Southwest
Wed 2/256:30 am
HRL
- STL
2 stops7h 05m
Southwest
Deal found 2/10![Southwest logo]()
$298
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:30 pm
STL
- HRL
1 stop5h 35m
Southwest
Mon 3/96:25 pm
HRL
- STL
1 stop5h 40m
Southwest
Deal found 2/11![Southwest logo]()
$303
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:50 am
STL
- HRL
1 stop6h 44m
United Airlines
Sat 10/315:15 am
HRL
- STL
1 stop4h 27m
United Airlines
Deal found 2/8![United Airlines logo]()
$338
Best flights from St. Louis to HarlingenDiscover carefully curated flight deals from St. Louis to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 11, 2026.
Discover carefully curated flight deals from St. Louis to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 11, 2026.
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:12 am
STL
- HRL
1 stop5h 00m
American Airlines
Wed 3/46:00 am
HRL
- STL
1 stop5h 01m
American Airlines
Deal found 2/10![American Airlines logo]()
$245
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/266:30 pm
STL
- HRL
1 stop5h 35m
Southwest
Mon 3/306:25 pm
HRL
- STL
1 stop5h 40m
Southwest
Deal found 2/10![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/249:55 am
STL
- HRL
2 stops12h 04m
United Airlines
Sat 2/285:22 pm
HRL
- STL
1 stop4h 52m
United Airlines
Deal found 2/9![United Airlines logo]()
$280
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:30 pm
STL
- HRL
1 stop5h 35m
Southwest
Mon 3/96:25 pm
HRL
- STL
1 stop5h 40m
Southwest
Deal found 2/11![Southwest logo]()
$303
Last-minute flights from St. Louis to HarlingenDiscover last-minute flight deals from St. Louis to Harlingen. Data last updated February 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Harlingen. Data last updated February 11, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:12 am
STL
- HRL
1 stop5h 00m
American Airlines
Wed 2/256:46 pm
HRL
- STL
1 stop4h 36m
American Airlines
Deal found 2/10![American Airlines logo]()
$268
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1811:55 am
STL
- HRL
1 stop5h 10m
Southwest
Wed 2/256:30 am
HRL
- STL
2 stops7h 05m
Southwest
Deal found 2/10![Southwest logo]()
$298
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:12 am
STL
- HRL
1 stop5h 00m
American Airlines
Wed 3/46:00 am
HRL
- STL
1 stop5h 01m
American Airlines
Deal found 2/10![American Airlines logo]()
$245
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/249:55 am
STL
- HRL
2 stops12h 04m
United Airlines
Sat 2/285:22 pm
HRL
- STL
1 stop4h 52m
United Airlines
Deal found 2/9![United Airlines logo]()
$280
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:30 pm
STL
- HRL
1 stop5h 35m
Southwest
Mon 3/96:25 pm
HRL
- STL
1 stop5h 40m
Southwest
Deal found 2/11![Southwest logo]()
$303
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/266:30 pm
STL
- HRL
1 stop5h 35m
Southwest
Mon 3/306:25 pm
HRL
- STL
1 stop5h 40m
Southwest
Deal found 2/10![Southwest logo]()
$277
Find flight deals from St. Louis to Harlingen
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Harlingen (HRL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $245 (American Airlines) |
Popular in | December |
Cheapest in | May |
Average price | $356 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Harlingen 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, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from St. Louis to Harlingen that are best for you.
Fly from
St. Louis
Fly to
Harlingen
Route
Depart
Return
Price
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Mon 2/23
5:12 am-10:12 am
1 stop5h 00m
Harlingen Valley Intl
Wed 3/4
6:00 am-11:01 am
1 stop5h 01m
$245
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Thu 3/26
6:30 pm-12:05 am
1 stop5h 35m
Harlingen Valley Intl
Mon 3/30
6:25 pm-12:05 am
1 stop5h 40m
$277
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Tue 2/24
9:55 am-9:59 pm
2 stops12h 04m
Harlingen Valley Intl
Sat 2/28
5:22 pm-10:14 pm
1 stop4h 52m
$280
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Fri 3/6
6:30 pm-12:05 am
1 stop5h 35m
Harlingen Valley Intl
Mon 3/9
6:25 pm-12:05 am
1 stop5h 40m
$303
Compare providers for flights from St. Louis to Harlingen
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Harlingen in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Harlingen, Texas flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Harlingen, Texas flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Harlingen, Texas flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Harlingen, Texas flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Harlingen, Texas flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Harlingen
Have a flexible travel schedule? Discover the best time to fly to Harlingen from St. Louis with our price prediction graph.
STL-HRL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Harlingen
Prices
More
What is the cheapest month to book a flight from St. Louis to Harlingen, Texas?
Currently, May is the cheapest month in which you can book a flight from St. Louis to Harlingen, Texas (average of $196). Flying from St. Louis to Harlingen, Texas in June is currently the most expensive (average of $336). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from St. Louis to Harlingen, Texas?
What’s the top layover airport for flights from St. Louis to Harlingen, Texas?
Share of 1-stop round-trip flights from St. Louis to Harlingen, Texas chosen by Cheapflights users in the past 12 months, using the same layover each way.
Houston (IAH) – chosen by Cheapflights users on 50% of 1-stop itineraries from St. Louis to Harlingen, Texas on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to Harlingen, Texas?
Average round-trip fare for 1-stop flights from St. Louis to Harlingen, Texas, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Houston (HOU) is the most affordable 1-stop option, with an average round-trip price of $217.
What’s the fastest layover option from St. Louis to Harlingen, Texas?
Shortest average travel time for 1-stop one-way flights from St. Louis to Harlingen, Texas, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Houston (HOU) have the shortest average one-way travel time for 1-stop routes: 4h 55m.
Which airport typically offers the quickest layover for flights from St. Louis to Harlingen, Texas?
Average layover duration for 1-stop one-way flights from St. Louis to Harlingen, Texas, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Houston (IAH) offer the fastest connection on this route, with an average layover time of 1h 17m.
Reviews of airlines servicing Harlingen
Get insights into the airlines that provide service to Harlingen. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Harlingen. Reviews last updated February 11, 2026.
Get a feel of what it's like to fly with Southwest and American Airlines from St. Louis to Harlingen by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Food
7.0
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Harlingen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Complete your trip
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Other flights to Harlingen
Explore flights to Harlingen departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 11, 2026.
St. Louis and Harlingen flights
Browse other St. Louis and Harlingen flight options. Last updated on February 11, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on February 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from St. Louis to Harlingen
Discover the top 2 airlines that operate flights from St. Louis to Harlingen. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$196 | Average$309 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$221 | Average$378 | FlexibilityNo cancel fee | On-time71% |