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Cheap flights from St. Louis to Harlingen from $165

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Harlingen departing on 7/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Harlingen

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
8:30 am - 1:30 pm
STL
-
HRL
5h 00m
1 stop
Southwest Logo
11:15 am - 6:00 pm
HRL
-
STL
6h 45m
1 stop
$360Southwest
Tue, Jun 30 - Sat, Jul 4
Southwest Logo
8:30 am - 1:30 pm
STL
-
HRL
5h 00m
1 stop
Southwest Logo
11:15 am - 6:05 pm
HRL
-
STL
6h 50m
2 stops
$365Southwest
Tue, Jun 30 - Sat, Jul 4
Southwest Logo
5:45 am - 10:45 am
STL
-
HRL
5h 00m
1 stop
Southwest Logo
5:15 am - 9:25 am
HRL
-
STL
4h 10m
1 stop
$374Southwest
Sat, Jul 25 - Thu, Jul 30
Southwest Logo
5:45 am - 10:45 am
STL
-
HRL
5h 00m
1 stop
Southwest Logo
6:30 pm - 12:40 am
HRL
-
STL
6h 10m
2 stops
$379Southwest
Sat, Jul 25 - Thu, Jul 30
Southwest Logo
9:40 am - 4:15 pm
STL
-
HRL
6h 35m
2 stops
Southwest Logo
11:15 am - 6:05 pm
HRL
-
STL
6h 50m
2 stops
$395Southwest
Tue, Jun 30 - Sat, Jul 4
Southwest Logo
4:40 pm - 10:45 pm
STL
-
HRL
6h 05m
2 stops
Southwest Logo
6:30 pm - 12:40 am
HRL
-
STL
6h 10m
2 stops
$405Southwest
Sat, Jul 25 - Thu, Jul 30
United Airlines Logo
6:15 am - 10:59 am
STL
-
HRL
4h 44m
1 stop
United Airlines Logo
5:10 am - 9:42 am
HRL
-
STL
4h 32m
1 stop
$408United Airlines
Tue, Nov 17 - Wed, Nov 18
United Airlines Logo
4:17 pm - 9:44 pm
STL
-
HRL
5h 27m
1 stop
United Airlines Logo
5:10 am - 3:38 pm
HRL
-
STL
10h 28m
2 stops
$413United Airlines
Tue, Nov 17 - Wed, Nov 18
United Airlines Logo
8:50 am - 3:34 pm
STL
-
HRL
6h 44m
1 stop
United Airlines Logo
5:10 am - 9:42 am
HRL
-
STL
4h 32m
1 stop
$414United Airlines
Tue, Nov 17 - Wed, Nov 18
United Airlines Logo
11:00 am - 3:34 pm
STL
-
HRL
4h 34m
1 stop
United Airlines Logo
5:10 am - 3:38 pm
HRL
-
STL
10h 28m
2 stops
$419United Airlines
Tue, Nov 17 - Wed, Nov 18

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Southwest flights from St. Louis to Harlingen

Our best Southwest deals on St. Louis to Harlingen flight tickets
Southwest
Jun 30
STL8:30 amLambert-St Louis
5h 00m
1 stop
HRL1:30 pmHarlingen Valley Intl
Jul 4
HRL11:15 amHarlingen Valley Intl
6h 45m
1 stop
STL6:00 pmLambert-St Louis
$360
Southwest
Jun 30
STL8:30 amLambert-St Louis
5h 00m
1 stop
HRL1:30 pmHarlingen Valley Intl
Jul 4
HRL11:15 amHarlingen Valley Intl
6h 50m
2 stops
STL6:05 pmLambert-St Louis
$365
Southwest
Jul 25
STL5:45 amLambert-St Louis
5h 00m
1 stop
HRL10:45 amHarlingen Valley Intl
Jul 30
HRL5:15 amHarlingen Valley Intl
4h 10m
1 stop
STL9:25 amLambert-St Louis
$374

United Airlines flights from St. Louis to Harlingen

Our best United Airlines deals on St. Louis to Harlingen flight tickets
United Airlines
Nov 17
STL6:15 amLambert-St Louis
4h 44m
1 stop
HRL10:59 amHarlingen Valley Intl
Nov 18
HRL5:10 amHarlingen Valley Intl
4h 32m
1 stop
STL9:42 amLambert-St Louis
$408
United Airlines
Nov 17
STL4:17 pmLambert-St Louis
5h 27m
1 stop
HRL9:44 pmHarlingen Valley Intl
Nov 18
HRL5:10 amHarlingen Valley Intl
10h 28m
2 stops
STL3:38 pmLambert-St Louis
$413
United Airlines
Nov 17
STL8:50 amLambert-St Louis
6h 44m
1 stop
HRL3:34 pmHarlingen Valley Intl
Nov 18
HRL5:10 amHarlingen Valley Intl
4h 32m
1 stop
STL9:42 amLambert-St Louis
$414

momondo 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, momondo users made 832,500 searches. Data last updated June 15, 2026.
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

Cheapest round-trip

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 6/30

8:30 am-1:30 pm

1 stop5h 00m

Harlingen Valley Intl

Sat 7/4

11:15 am-6:00 pm

1 stop6h 45m

$360

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 6/30

8:30 am-1:30 pm

1 stop5h 00m

Harlingen Valley Intl

Sat 7/4

11:15 am-6:05 pm

2 stops6h 50m

$365
Quickest round-trip

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sat 7/25

5:45 am-10:45 am

1 stop5h 00m

Harlingen Valley Intl

Thu 7/30

5:15 am-9:25 am

1 stop4h 10m

$374

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sat 7/25

5:45 am-10:45 am

1 stop5h 00m

Harlingen Valley Intl

Thu 7/30

6:30 pm-12:40 am

2 stops6h 10m

$379

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 6/30

9:40 am-4:15 pm

2 stops6h 35m

Harlingen Valley Intl

Sat 7/4

11:15 am-6:05 pm

2 stops6h 50m

$395

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sat 7/25

4:40 pm-10:45 pm

2 stops6h 05m

Harlingen Valley Intl

Thu 7/30

6:30 pm-12:40 am

2 stops6h 10m

$405

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 11/17

6:15 am-10:59 am

1 stop4h 44m

Harlingen Valley Intl

Wed 11/18

5:10 am-9:42 am

1 stop4h 32m

$408

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 11/17

4:17 pm-9:44 pm

1 stop5h 27m

Harlingen Valley Intl

Wed 11/18

5:10 am-3:38 pm

2 stops10h 28m

$413

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 11/17

8:50 am-3:34 pm

1 stop6h 44m

Harlingen Valley Intl

Wed 11/18

5:10 am-9:42 am

1 stop4h 32m

$414

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 11/17

11:00 am-3:34 pm

1 stop4h 34m

Harlingen Valley Intl

Wed 11/18

5:10 am-3:38 pm

2 stops10h 28m

$419

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Harlingen from

How to get the cheapest flight ticket from St. Louis to Harlingen

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Harlingen?

What is the cheapest month to fly to Harlingen?

If you aren’t able to travel during the month of July, then book flights to Harlingen from St. Louis during October instead. Flights to Harlingen in October, while not as cheap as those in July, still average around $216.

Can stopping save me money on St. Louis to Harlingen flights?

You could potentially save up to 5% on your flight if you consider stops on a St. Louis to Harlingen flight.

When to book flights from St. Louis to Harlingen

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Harlingen according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Harlingen (STL to HRL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Harlingen

Fastest flight time

5h 00m

Direct flights

None
The fastest flight from St. Louis to Harlingen takes 5h 00m
There are no direct flights from St. Louis to Harlingen. There are no popular flight routes from St. Louis to Harlingen.
Search flight deals

Frequently asked questions about flying from St. Louis to Harlingen

  • How far is Lambert-St Louis to Harlingen Valley Intl by plane?

    There are 962.6 mi between Lambert-St Louis and Harlingen Valley Intl. In terms of flight time, this usually takes a little over 5h 00m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Harlingen Valley Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Harlingen Valley Intl Airport were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Harlingen Valley Intl Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Harlingen Valley Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Harlingen Valley Intl Airport.

  • What documentation or ID do you need to fly to Harlingen Valley Intl Airport?

    The travel and health documents required for your trip to Harlingen Valley Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Harlingen Valley Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Harlingen?

Best airlines flying from St. Louis to Harlingen

Compare and see reviews for airlines that fly from St. Louis to Harlingen with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $212Free CancellationRating
7.1
11,654 reviews
Search American Airlines flights
SouthwestPriceFrom $216Free CancellationRating
7.9
4,234 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Harlingen?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Harlingen. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Harlingen with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Harlingen flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Harlingen?

Once you have performed a search for St. Louis to Harlingen flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Harlingen right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Harlingen now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Harlingen and let you know when they change.

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