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Cheap flights from St. Louis to Harlingen from $219

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Harlingen departing on 10/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Harlingen

Cheap round-trip flights

United Airlines Logo
8:25 am - 1:19 pmSTL-HRL
4h 54m1 stop
United Airlines Logo
2:05 pm - 6:57 pmHRL-STL
4h 52m1 stop
$219United Airlines
Find Deal
Thu, Oct 9 - Thu, Oct 16
Southwest Logo
5:30 am - 1:45 pmSTL-HRL
8h 15m1 stop
Southwest Logo
7:30 am - 2:10 pmHRL-STL
6h 40m1 stop
$243Southwest
Find Deal
Fri, Oct 17 - Tue, Oct 21
United Airlines Logo
12:25 pm - 11:18 pmSTL-HRL
10h 53m2 stops
United Airlines Logo
2:05 pm - 6:57 pmHRL-STL
4h 52m1 stop
$247United Airlines
Find Deal
Thu, Oct 9 - Thu, Oct 16
Southwest Logo
5:30 am - 1:45 pmSTL-HRL
8h 15m1 stop
Southwest Logo
11:45 am - 7:05 pmHRL-STL
7h 20m2 stops
$249Southwest
Find Deal
Fri, Oct 17 - Tue, Oct 21
Southwest Logo
3:25 pm - 10:35 pmSTL-HRL
7h 10m1 stop
Southwest Logo
10:45 am - 2:55 pmHRL-STL
4h 10m1 stop
$274Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 6
Southwest Logo
5:30 am - 1:45 pmSTL-HRL
8h 15m1 stop
Southwest Logo
10:45 am - 2:55 pmHRL-STL
4h 10m1 stop
$279Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 6
Southwest Logo
5:30 am - 1:45 pmSTL-HRL
8h 15m1 stop
Southwest Logo
6:00 am - 9:50 amHRL-STL
3h 50m1 stop
$284Southwest
Find Deal
Fri, Oct 17 - Mon, Oct 20
Southwest Logo
5:30 am - 1:45 pmSTL-HRL
8h 15m1 stop
Southwest Logo
10:45 am - 6:00 pmHRL-STL
7h 15m2 stops
$285Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 6
Southwest Logo
12:10 pm - 10:35 pmSTL-HRL
10h 25m2 stops
Southwest Logo
10:45 am - 6:00 pmHRL-STL
7h 15m2 stops
$300Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 6
Southwest Logo
12:10 pm - 10:35 pmSTL-HRL
10h 25m2 stops
Southwest Logo
10:45 am - 6:00 pmHRL-STL
7h 15m2 stops
$315Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 6

Southwest flights from St. Louis to Harlingen, Texas

Our best Southwest deals on St. Louis to Harlingen, Texas flight tickets
Southwest
Oct 17
STL5:30 amLambert-St Louis
8h 15m
1 stop
HRL1:45 pmHarlingen Valley Intl
Oct 21
HRL7:30 amHarlingen Valley Intl
6h 40m
1 stop
STL2:10 pmLambert-St Louis
$243
Find similar
Southwest
Oct 17
STL5:30 amLambert-St Louis
8h 15m
1 stop
HRL1:45 pmHarlingen Valley Intl
Oct 21
HRL11:45 amHarlingen Valley Intl
7h 20m
2 stops
STL7:05 pmLambert-St Louis
$249
Find similar
Southwest
Oct 3
STL3:25 pmLambert-St Louis
7h 10m
1 stop
HRL10:35 pmHarlingen Valley Intl
Oct 6
HRL10:45 amHarlingen Valley Intl
4h 10m
1 stop
STL2:55 pmLambert-St Louis
$274
Find similar

United Airlines flights from St. Louis to Harlingen, Texas

Our best United Airlines deals on St. Louis to Harlingen, Texas flight tickets
United Airlines
Oct 9
STL8:25 amLambert-St Louis
4h 54m
1 stop
HRL1:19 pmHarlingen Valley Intl
Oct 16
HRL2:05 pmHarlingen Valley Intl
4h 52m
1 stop
STL6:57 pmLambert-St Louis
$219
Find similar
United Airlines
Oct 9
STL12:25 pmLambert-St Louis
10h 53m
2 stops
HRL11:18 pmHarlingen Valley Intl
Oct 16
HRL2:05 pmHarlingen Valley Intl
4h 52m
1 stop
STL6:57 pmLambert-St Louis
$247
Find similar
United Airlines
Oct 9
STL5:00 amLambert-St Louis
8h 19m
2 stops
HRL1:19 pmHarlingen Valley Intl
Oct 16
HRL5:00 amHarlingen Valley Intl
9h 27m
2 stops
STL2:27 pmLambert-St Louis
$411
Find similar

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 September 16, 2025.
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

Thu 10/9

8:25 am-1:19 pm

1 stop4h 54m

Harlingen Valley Intl

Thu 10/16

2:05 pm-6:57 pm

1 stop4h 52m

$219

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/17

5:30 am-1:45 pm

1 stop8h 15m

Harlingen Valley Intl

Tue 10/21

7:30 am-2:10 pm

1 stop6h 40m

$243

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Thu 10/9

12:25 pm-11:18 pm

2 stops10h 53m

Harlingen Valley Intl

Thu 10/16

2:05 pm-6:57 pm

1 stop4h 52m

$247

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/17

5:30 am-1:45 pm

1 stop8h 15m

Harlingen Valley Intl

Tue 10/21

11:45 am-7:05 pm

2 stops7h 20m

$249

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/3

3:25 pm-10:35 pm

1 stop7h 10m

Harlingen Valley Intl

Mon 10/6

10:45 am-2:55 pm

1 stop4h 10m

$274

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/3

5:30 am-1:45 pm

1 stop8h 15m

Harlingen Valley Intl

Mon 10/6

10:45 am-2:55 pm

1 stop4h 10m

$279

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/17

5:30 am-1:45 pm

1 stop8h 15m

Harlingen Valley Intl

Mon 10/20

6:00 am-9:50 am

1 stop3h 50m

$284

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/3

5:30 am-1:45 pm

1 stop8h 15m

Harlingen Valley Intl

Mon 10/6

10:45 am-6:00 pm

2 stops7h 15m

$285

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/3

12:10 pm-10:35 pm

2 stops10h 25m

Harlingen Valley Intl

Mon 10/6

10:45 am-6:00 pm

2 stops7h 15m

$300

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/3

12:10 pm-10:35 pm

2 stops10h 25m

Harlingen Valley Intl

Mon 10/6

10:45 am-6:00 pm

2 stops7h 15m

$315

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

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

What is the cheapest day to depart on your flight to Harlingen, Texas?

The cheapest day to depart on your flight to Harlingen, Texas is on a Monday when prices can be found for as low as $290. This is often the case because there is less demand to fly during this day of the week. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Harlingen, Texas for around $421.

What is the cheapest time of day to depart on your flight to Harlingen, Texas?

Our most recent data shows that the best time of day to fly to Harlingen, Texas is in the afternoon. Flights from St. Louis to Harlingen, Texas during this time can be as low as $377. Flights in the morning are often more expensive with an average ticket price of $397.

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

Direct flights

None
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 4h 54m.

  • 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
4,242 reviews
Search Southwest flights
American AirlinesPriceFrom $213Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $353Free CancellationRating
7.9
7,957 reviews
Search Delta 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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