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

Southwest, at $238, 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 33% cheaper than the average price of flights available within the next 90 days to this destination.

What is the cheapest day to fly from St. Louis to Harlingen, Texas?

Travelers seeking maximum savings on their St. Louis to Harlingen, Texas flight should consider departing on Monday mornings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What are the most popular airlines that fly from St. Louis to Harlingen, Texas?

When booking a flight from St. Louis to Harlingen, Texas, you may want to consider flying on American Airlines, Delta or United Airlines as they are the most popular for this route.

What is the cheapest day to fly round-trip from St. Louis to Harlingen, Texas?

Departing on a Sunday is a good option for securing a great price. You can expect to save up to 45% when planning your travel around this day of the week.

What is the cheapest month to fly from St. Louis to Harlingen, Texas?

Flights from St. Louis to Harlingen, Texas lean towards being more expensive in March. Prices are generally better when you fly from St. Louis to Harlingen, Texas in May, with the cheapest ticket starting at $196.

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.

$230+ Flights from St. Louis to Harlingen, TX

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Cheap flight deals from St. Louis to Harlingen

Round-trip from	$238 (Southwest)
One-way from	$230 (United Airlines)
Popular in	March
Cheapest in	May
Average price	$401

From Lambert-St Louis to Harlingen Valley Intl

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

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Highest demand for flights based on searches. 7% potential increase in price ($26 potential increase over avg. RT price).

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Cheapest flight prices on average. 5% potential price decrease ($18 potential savings vs. average RT price).

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Average for round-trip flights in June 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 June 12, 2025.

Thu 11/62:40 pmSTL - HRL

1 stop4h 45mSouthwest

Sun 11/95:45 amHRL - STL

1 stop3h 55mSouthwest

Deal found 6/11

$238

Sat 8/307:23 amSTL - HRL

2 stops10h 37mAmerican Airlines

Sat 9/2010:11 amHRL - STL

1 stop4h 58mAmerican Airlines

Deal found 6/10

$244

Tue 12/236:04 amSTL - HRL

1 stop8h 32mDelta

Sun 12/283:35 pmHRL - STL

1 stop6h 26mDelta

Deal found 6/11

$438

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 June 12, 2025.

Thu 11/62:40 pmSTL - HRL

1 stop4h 45mSouthwest

Sun 11/95:45 amHRL - STL

1 stop3h 55mSouthwest

Deal found 6/11

$238

Sat 8/307:23 amSTL - HRL

2 stops10h 37mAmerican Airlines

Sat 9/2010:11 amHRL - STL

1 stop4h 58mAmerican Airlines

Deal found 6/10

$244

Last-minute flights from St. Louis to Harlingen
Discover last-minute flight deals from St. Louis to Harlingen. Data last updated June 12, 2025 and is based on user searches.

Thu 6/265:37 amSTL - HRL

1 stop3h 58mAmerican Airlines

Mon 6/307:59 pmHRL - STL

1 stop13h 19mAmerican Airlines

Deal found 6/11

$410

Fri 7/185:10 amSTL - HRL

1 stop4h 05mSouthwest

Fri 7/255:15 amHRL - STL

1 stop5h 00mSouthwest

Deal found 6/12

$257

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 June 12, 2025.

Wed 7/95:00 amSTL - HRL

2 stops8h 20mUnited Airlines

Deal found 6/11

$230

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

Sat 8/30

3:25 pm-8:35 pm

1 stop5h 10m

Harlingen Valley Intl

Sat 9/20

12:50 pm-7:45 pm

1 stop6h 55m

$239

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sat 8/30

7:23 am-6:00 pm

2 stops10h 37m

Harlingen Valley Intl

Sat 9/20

10:11 am-3:09 pm

1 stop4h 58m

$244

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 7/9

5:00 am-1:20 pm

2 stops8h 20m

$230

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 $395). 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 6% on flights from St. Louis to Harlingen, Texas by exploring options for tickets at noon.

Rainfall in Harlingen by month

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.

Temperature in Harlingen by month

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).

Reviews of airlines servicing Harlingen

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.0

Very good

4,287 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines

7.4

Good

8,790 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

What are the cheapest airlines flying from St. Louis to Harlingen, Texas round-trip?
Southwest, at $238, 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 33% 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 $395). 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 4 airlines flying from St. Louis to Harlingen

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$196	Average$327	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$197	Average$322	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$208	Average$328	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$329	Average$421	FlexibilityNo cancel fee	On-timeN/A

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$230+ 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 7/9. 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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from St. Louis to Harlingen

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 June 12, 2025.

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 June 12, 2025.

Cheapflights Fare Finder

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

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?

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 June 12, 2025.

Rainfall in Harlingen by month

Plan your trip to Harlingen by taking into account the average rainfall totals by month.

Temperature in Harlingen by month

Plan your trip to Harlingen by taking into account the average temperature totals by month.

Reviews of airlines servicing Harlingen

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.

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

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Top 4 airlines flying from St. Louis to Harlingen

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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 June 12, 2025.