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Cheap flights from St. Louis to Harlingen from $99

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 4/15. 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
0 bags

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Find the cheapest flights from St. Louis to Harlingen

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
4:25 pm - 10:00 pm
STL
-
HRL
5h 35m
1 stop
Southwest Logo
10:45 am - 2:50 pm
HRL
-
STL
4h 05m
1 stop
$197Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
2:30 pm - 10:00 pm
STL
-
HRL
7h 30m
2 stops
Southwest Logo
10:45 am - 2:50 pm
HRL
-
STL
4h 05m
1 stop
$202Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
6:30 pm - 12:05 am
STL
-
HRL
5h 35m
1 stop
Southwest Logo
6:25 pm - 12:05 am
HRL
-
STL
5h 40m
1 stop
$240Southwest
Mon, Mar 30 - Mon, Apr 6
Southwest Logo
4:25 pm - 12:05 am
STL
-
HRL
7h 40m
2 stops
Southwest Logo
6:25 pm - 12:05 am
HRL
-
STL
5h 40m
1 stop
$245Southwest
Mon, Mar 30 - Mon, Apr 6
Southwest Logo
8:25 am - 4:00 pm
STL
-
HRL
7h 35m
2 stops
Southwest Logo
10:45 am - 6:00 pm
HRL
-
STL
7h 15m
2 stops
$263Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
4:05 pm - 9:25 pm
STL
-
HRL
5h 20m
1 stop
Southwest Logo
5:05 pm - 10:50 pm
HRL
-
STL
5h 45m
1 stop
$302Southwest
Wed, Mar 18 - Wed, Mar 25
Southwest Logo
4:25 pm - 12:05 am
STL
-
HRL
7h 40m
2 stops
Southwest Logo
6:25 pm - 12:05 am
HRL
-
STL
5h 40m
2 stops
$306Southwest
Mon, Mar 30 - Mon, Apr 6
Southwest Logo
8:40 am - 4:10 pm
STL
-
HRL
7h 30m
2 stops
Southwest Logo
6:05 am - 12:40 pm
HRL
-
STL
6h 35m
1 stop
$322Southwest
Wed, Mar 18 - Wed, Mar 25
Southwest Logo
4:30 pm - 11:00 pm
STL
-
HRL
6h 30m
2 stops
Southwest Logo
6:00 pm - 12:15 am
HRL
-
STL
6h 15m
2 stops
$348Southwest
Fri, May 15 - Fri, May 22
Southwest Logo
5:10 am - 11:20 am
STL
-
HRL
6h 10m
1 stop
Southwest Logo
5:30 am - 11:50 am
HRL
-
STL
6h 20m
1 stop
$373Southwest
Sun, Mar 29 - Sun, Apr 5

Southwest flights from St. Louis to Harlingen, Texas

Our best Southwest deals on St. Louis to Harlingen, Texas flight tickets
Southwest
May 13
STL4:25 pmLambert-St Louis
5h 35m
1 stop
HRL10:00 pmHarlingen Valley Intl
May 20
HRL10:45 amHarlingen Valley Intl
4h 05m
1 stop
STL2:50 pmLambert-St Louis
$197
Southwest
May 13
STL2:30 pmLambert-St Louis
7h 30m
2 stops
HRL10:00 pmHarlingen Valley Intl
May 20
HRL10:45 amHarlingen Valley Intl
4h 05m
1 stop
STL2:50 pmLambert-St Louis
$202
Southwest
Mar 30
STL6:30 pmLambert-St Louis
5h 35m
1 stop
HRL12:05 amHarlingen Valley Intl
Apr 6
HRL6:25 pmHarlingen Valley Intl
5h 40m
1 stop
STL12:05 amLambert-St Louis
$240

American Airlines flights from St. Louis to Harlingen, Texas

Our best American Airlines deals on St. Louis to Harlingen, Texas flight tickets
American Airlines
May 29
STL5:29 amLambert-St Louis
4h 39m
1 stop
HRL10:08 amHarlingen Valley Intl
Jun 5
HRL4:57 pmHarlingen Valley Intl
4h 40m
1 stop
STL9:37 pmLambert-St Louis
$384
American Airlines
Mar 29
STL7:00 amLambert-St Louis
7h 14m
1 stop
HRL2:14 pmHarlingen Valley Intl
Apr 5
HRL6:00 amHarlingen Valley Intl
4h 59m
1 stop
STL10:59 amLambert-St Louis
$385
American Airlines
Mar 29
STL5:12 amLambert-St Louis
5h 00m
1 stop
HRL10:12 amHarlingen Valley Intl
Apr 5
HRL6:00 amHarlingen Valley Intl
4h 59m
1 stop
STL10:59 amLambert-St Louis
$402

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Harlingen, Texas 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 March 3, 2026.
Use the filters below to find and compare flights from St. Louis to Harlingen, Texas that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 5/13

4:25 pm-10:00 pm

1 stop5h 35m

Harlingen Valley Intl

Wed 5/20

10:45 am-2:50 pm

1 stop4h 05m

$197

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 5/13

2:30 pm-10:00 pm

2 stops7h 30m

Harlingen Valley Intl

Wed 5/20

10:45 am-2:50 pm

1 stop4h 05m

$202

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Mon 3/30

6:30 pm-12:05 am

1 stop5h 35m

Harlingen Valley Intl

Mon 4/6

6:25 pm-12:05 am

1 stop5h 40m

$240

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Mon 3/30

4:25 pm-12:05 am

2 stops7h 40m

Harlingen Valley Intl

Mon 4/6

6:25 pm-12:05 am

1 stop5h 40m

$245

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 5/13

8:25 am-4:00 pm

2 stops7h 35m

Harlingen Valley Intl

Wed 5/20

10:45 am-6:00 pm

2 stops7h 15m

$263

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 3/18

4:05 pm-9:25 pm

1 stop5h 20m

Harlingen Valley Intl

Wed 3/25

5:05 pm-10:50 pm

1 stop5h 45m

$302

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Mon 3/30

4:25 pm-12:05 am

2 stops7h 40m

Harlingen Valley Intl

Mon 4/6

6:25 pm-12:05 am

2 stops5h 40m

$306

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 3/18

8:40 am-4:10 pm

2 stops7h 30m

Harlingen Valley Intl

Wed 3/25

6:05 am-12:40 pm

1 stop6h 35m

$322

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 5/15

4:30 pm-11:00 pm

2 stops6h 30m

Harlingen Valley Intl

Fri 5/22

6:00 pm-12:15 am

2 stops6h 15m

$348

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sun 3/29

5:10 am-11:20 am

1 stop6h 10m

Harlingen Valley Intl

Sun 4/5

5:30 am-11:50 am

1 stop6h 20m

$373

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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, Texas

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

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

You could potentially save up to 51% on your flight if you consider stops on a St. Louis to Harlingen, Texas flight.

When to book flights from St. Louis to Harlingen, Texas

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

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

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

Fastest flight time

5h 16m

Direct flights

None
The fastest flight from St. Louis to Harlingen, Texas takes 5h 16m
There are no direct flights from St. Louis to Harlingen, Texas. There are no popular flight routes from St. Louis to Harlingen, Texas.
Search flight deals

  • 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 16m.

  • 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, Texas?

Best airlines flying from St. Louis to Harlingen, Texas

Compare and see reviews for airlines that fly from St. Louis to Harlingen, Texas with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $196Free CancellationRating
8.0
4,302 reviews
Search Southwest flights
American AirlinesPriceFrom $221Free CancellationRating
7.1
11,375 reviews
Search American Airlines flights
United AirlinesPriceFrom $235Free CancellationRating
7.4
9,377 reviews
Search United Airlines 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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