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 15m. Fly via United Airlines or Southwest 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. An alternate airline flying to your destination would be American Airlines. Southwest is 37% cheaper than the average price of flights available within the next 90 days to this destination.

In terms of precipitation, rainfall in Harlingen, Texas ranges from 1.1 - 5.2 inches per month. September is typically the wettest month, when rainfall can reach 5.2 in. January is typically the driest time to visit Harlingen, Texas when rainfall is around 1.1 in.

If weather is an important factor for your trip to Harlingen, Texas, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 60.8 F).

Most accurate provider : When it comes to deals on St. Louis-Harlingen, Texas flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Harlingen, Texas flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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.

$112+ Flights from St. Louis to Harlingen, TX

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Cheap flight deals from St. Louis to Harlingen

Best flights from St. Louis to Harlingen
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 diciembre 28, 2025.

dom. 2/86:00 amSTL - HRL

1 stop5h 26mUnited Airlines

jue. 2/125:20 pmHRL - STL

1 stop4h 54mUnited Airlines

Deal found 12/25

$236

mié. 2/116:00 amSTL - HRL

1 stop4h 15mSouthwest

mar. 2/175:40 amHRL - STL

1 stop8h 55mSouthwest

Deal found 12/26

$246

dom. 2/86:00 amSTL - HRL

2 stops8h 46mAmerican Airlines

jue. 2/122:43 pmHRL - STL

1 stop4h 42mAmerican Airlines

Deal found 12/25

$271

dom. 1/254:35 pmSTL - HRL

1 stop5h 24mUnited Airlines

dom. 2/15:25 pmHRL - STL

1 stop4h 35mUnited Airlines

Deal found 12/26

$249

mié. 1/146:00 amSTL - HRL

1 stop4h 15mSouthwest

mar. 1/2012:15 pmHRL - STL

1 stop4h 15mSouthwest

Deal found 12/27

$256

mar. 1/206:00 amSTL - HRL

1 stop5h 26mUnited Airlines

sáb. 1/249:20 amHRL - STL

1 stop6h 19mUnited Airlines

Deal found 12/25

$283

mié. 1/146:00 amSTL - HRL

1 stop5h 26mUnited Airlines

sáb. 1/175:25 pmHRL - STL

1 stop4h 35mUnited Airlines

Deal found 12/27

$285

Last-minute flights from St. Louis to Harlingen
Discover last-minute flight deals from St. Louis to Harlingen. Data last updated diciembre 28, 2025 and is based on user searches.

dom. 1/115:20 pmSTL - HRL

1 stop6h 01mAmerican Airlines

jue. 1/156:44 pmHRL - STL

1 stop4h 11mAmerican Airlines

Deal found 12/27

$309

mié. 1/146:00 amSTL - HRL

1 stop4h 15mSouthwest

mar. 1/2012:15 pmHRL - STL

1 stop4h 15mSouthwest

Deal found 12/27

$256

mié. 1/145:04 pmSTL - HRL

1 stop6h 17mAmerican Airlines

sáb. 1/176:02 amHRL - STL

2 stops7h 07mAmerican Airlines

Deal found 12/27

$271

mié. 1/146:00 amSTL - HRL

1 stop5h 26mUnited Airlines

sáb. 1/175:25 pmHRL - STL

1 stop4h 35mUnited Airlines

Deal found 12/27

$285

mar. 1/206:00 amSTL - HRL

1 stop5h 26mUnited Airlines

sáb. 1/249:20 amHRL - STL

1 stop6h 19mUnited Airlines

Deal found 12/25

$283

dom. 1/254:35 pmSTL - HRL

1 stop5h 24mUnited Airlines

dom. 2/15:25 pmHRL - STL

1 stop4h 35mUnited Airlines

Deal found 12/26

$249

One-way flights from St. Louis to Harlingen
Search for one-way flight options from St. Louis to Harlingen. Find affordable one-way fares based on user searches. Data last updated diciembre 28, 2025.

lun. 2/235:55 pmSTL - HRL

1 stop4h 57mAmerican Airlines

Deal found 12/27

$112

sáb. 1/38:05 amSTL - HRL

2 stops11h 31mUnited Airlines

Deal found 12/27

$181

sáb. 1/310:10 pmSTL - HRL

3 stops36h 37mMultiple Airlines

Deal found 12/27

$697

Find flight deals from St. Louis to Harlingen

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$213 (American Airlines)
One-way from	$112 (American Airlines)
Popular in	March
Cheapest in	May
Average price	$421

Provider with most accurate pricing for Lambert-St Louis-Harlingen Valley Intl flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Harlingen Valley Intl flights.

Search Deals

From Lambert-St Louis to Harlingen Valley Intl

Search Deals

One-way flight from Lambert-St Louis to Harlingen Valley Intl

Search Deals

Highest demand for flights based on searches. 17% potential increase in price ($68 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 9% potential price decrease ($27 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Harlingen that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

dom. 2/8

6:00 am-11:26 am

1 stop5h 26m

Harlingen Valley Intl

jue. 2/12

5:20 pm-10:14 pm

1 stop4h 54m

$236

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mié. 2/11

6:00 am-10:15 am

1 stop4h 15m

Harlingen Valley Intl

mar. 2/17

5:40 am-2:35 pm

1 stop8h 55m

$246

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

dom. 1/25

4:35 pm-9:59 pm

1 stop5h 24m

Harlingen Valley Intl

dom. 2/1

5:25 pm-10:00 pm

1 stop4h 35m

$249

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mié. 1/14

6:00 am-10:15 am

1 stop4h 15m

Harlingen Valley Intl

mar. 1/20

12:15 pm-4:30 pm

1 stop4h 15m

$256

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

dom. 2/8

6:00 am-2:46 pm

2 stops8h 46m

Harlingen Valley Intl

jue. 2/12

2:43 pm-7:25 pm

1 stop4h 42m

$271

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mar. 1/20

6:00 am-11:26 am

1 stop5h 26m

Harlingen Valley Intl

sáb. 1/24

9:20 am-3:39 pm

1 stop6h 19m

$283

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mié. 1/14

6:00 am-11:26 am

1 stop5h 26m

Harlingen Valley Intl

sáb. 1/17

5:25 pm-10:00 pm

1 stop4h 35m

$285

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

lun. 2/23

5:55 pm-10:52 pm

1 stop4h 57m

$112

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

sáb. 1/3

8:05 am-7:36 pm

2 stops11h 31m

$181

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

sáb. 1/3

10:10 pm-10:47 am

3 stops36h 37m

$697

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Compare providers for flights from St. Louis to Harlingen

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Harlingen, Texas flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, 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 July is currently the most expensive (average of $313). 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?

Unlike in the morning, when flights are generally more expensive, you can save up to 12% on flights from St. Louis to Harlingen, Texas by exploring options for tickets at noon.

Reviews of airlines servicing Harlingen

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.

Southwest

8.0

Very good

4,256 reviews

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

4,256 reviews

Southwest

8.0

Very good

4,256 reviews

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

11,072 reviews

Southwest

8.0

Very good

4,256 reviews

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

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 15m. Fly via United Airlines or Southwest 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. An alternate airline flying to your destination would be American Airlines. Southwest is 37% 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, 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 July is currently the most expensive (average of $313). 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

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from St. Louis to Harlingen

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$196	Average$327	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$228	Average$333	FlexibilityNo cancel fee	On-time71%

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$112+ Cheap flights from St. Louis to Harlingen, TX (STL - HRL)

This is the cheapest one-way 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.

Find cheap flights from St. Louis to Harlingen with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Harlingen

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 diciembre 28, 2025.

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 diciembre 28, 2025.

Find flight deals from St. Louis to Harlingen

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Harlingen that are best for you.

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 December.

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.

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?

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

Reviews of airlines servicing Harlingen

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.

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?

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Harlingen

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from St. Louis to Harlingen

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Best flights from St. Louis to Harlingen
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 diciembre 28, 2025.