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Harlingen

$289+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HRL
Oct 29 — Nov 51
Wed 10/29
Wed 11/5
1 adult, Economy
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Cheap 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 September 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$255
(American Airlines)

Popular in

March

Cheapest in

May

Average price

$280
Provider with most accurate pricing for Lambert-St Louis-Harlingen Valley Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Harlingen Valley Intl flights.
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From Lambert-St Louis to Harlingen Valley Intl
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Highest demand for flights based on searches. 14% potential increase in price ($55 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from St. Louis to Harlingen

Cheapest flights from St. Louis to Harlingen
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 September 29, 2025.

This Delta deal was found by Cheapflights users on 9/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:05 amSTL - HRL
1 stop8h 15mDelta
Sun 12/283:15 pmHRL - STL
1 stop7h 01mDelta
Deal found 9/27$479
This American Airlines deal was found by Cheapflights users on 9/27. 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 11/265:17 amSTL - HRL
1 stop4h 26mAmerican Airlines
Sat 11/298:02 pmHRL - STL
1 stop4h 24mAmerican Airlines
Deal found 9/27$488
This United Airlines deal was found by Cheapflights users on 9/28. 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 12/236:00 amSTL - HRL
1 stop13h 36mUnited Airlines
Sun 12/285:00 amHRL - STL
1 stop4h 49mUnited Airlines
Deal found 9/28$496
This American Airlines deal was found by Cheapflights users on 9/26. 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.
Tue 12/237:00 amSTL - HRL
1 stop7h 18mAmerican Airlines
Sun 12/285:34 amHRL - STL
2 stops8h 02mAmerican Airlines
Deal found 9/26$534
This Southwest deal was found by Cheapflights users on 9/27. 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 11/267:25 pmSTL - HRL
1 stop4h 30mSouthwest
Sat 11/299:50 amHRL - STL
2 stops8h 35mSouthwest
Deal found 9/27$600
This American Airlines deal was found by Cheapflights users on 9/26. 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.
Tue 11/255:17 amSTL - HRL
1 stop4h 26mAmerican Airlines
Sun 11/305:40 amHRL - STL
1 stop4h 57mAmerican Airlines
Deal found 9/26$649
This Delta deal was found by Cheapflights users on 9/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/276:04 amSTL - HRL
1 stop8h 15mDelta
Sat 1/33:14 pmHRL - STL
1 stop6h 54mDelta
Deal found 9/26$759

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 September 29, 2025.
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

Tue 12/23

6:05 am-2:20 pm

1 stop8h 15m

Harlingen Valley Intl

Sun 12/28

3:15 pm-10:16 pm

1 stop7h 01m

$479

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 11/26

5:17 am-9:43 am

1 stop4h 26m

Harlingen Valley Intl

Sat 11/29

8:02 pm-12:26 am

1 stop4h 24m

$488

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 12/23

6:00 am-7:36 pm

1 stop13h 36m

Harlingen Valley Intl

Sun 12/28

5:00 am-9:49 am

1 stop4h 49m

$496

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 12/23

7:00 am-2:18 pm

1 stop7h 18m

Harlingen Valley Intl

Sun 12/28

5:34 am-1:36 pm

2 stops8h 02m

$534

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 11/26

7:25 pm-11:55 pm

1 stop4h 30m

Harlingen Valley Intl

Sat 11/29

9:50 am-6:25 pm

2 stops8h 35m

$600

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/27

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 September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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

What is the cheapest month to book a flight from St. Louis to Harlingen, Texas?

Currently, April is the cheapest month in which you can book a flight from St. Louis to Harlingen, Texas (average of $267). Flying from St. Louis to Harlingen, Texas in June is currently the most expensive (average of $382). 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.

What is the cheapest time of day to fly from STL to HRL?

Find hourly flight availability from St. Louis to Harlingen. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 29, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 6% on flights from St. Louis to Harlingen, Texas by exploring options for tickets at noon.

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 September 29, 2025.
Get a feel of what it's like to fly with Southwest, Delta, 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.
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,964 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from St. Louis to Harlingen, Texas?

    There are many flights that can get you from St. Louis to Harlingen, Texas in 4h 26m. Fly via Delta, American Airlines, or United Airlines to get the fastest option. There are 962 mi between St. Louis and Harlingen, Texas. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from St. Louis to Harlingen, Texas round-trip?

    Southwest, at $196, was found to be the cheapest airline from St. Louis to Harlingen, Texas.Alternate airlines to your destination round-trip include American Airlines and Delta. Southwest is 40% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from St. Louis to Harlingen that include hotel bookings?

    Yes. In addition to deals on St. Louis to Harlingen flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Harlingen?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Harlingen.

  • Can I find deals for business class flights from St. Louis to Harlingen?

    Yes. Cheapflights offers flight deals from St. Louis to Harlingen by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Harlingen, Texas?

    Currently, April is the cheapest month in which you can book a flight from St. Louis to Harlingen, Texas (average of $267). Flying from St. Louis to Harlingen, Texas in June is currently the most expensive (average of $382). 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.

See more FAQs

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Top 3 airlines flying from St. Louis to Harlingen

Discover the top 3 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 September 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$196Average$313FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$213Average$328FlexibilityNo cancel feeOn-time71%
DeltaCheapest$353Average$421FlexibilityNo cancel feeOn-timeN/A

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