Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

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 10/2. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Harlingen

Cheap round-trip flights

American Airlines Logo
5:20 am - 9:38 amSTL-HRL
4h 18m1 stop
American Airlines Logo
10:08 am - 4:23 pmHRL-STL
6h 15m1 stop
$197American Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
American Airlines Logo
5:20 am - 9:38 amSTL-HRL
4h 18m1 stop
American Airlines Logo
5:25 am - 4:04 pmHRL-STL
10h 39m2 stops
$202American Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
Southwest Logo
8:15 am - 1:35 pmSTL-HRL
5h 20m1 stop
Southwest Logo
9:45 am - 2:45 pmHRL-STL
5h 00m1 stop
$217Southwest
Find Deal
Wed, Oct 1 - Fri, Oct 3
Southwest Logo
2:25 pm - 9:25 pmSTL-HRL
7h 00m2 stops
Southwest Logo
9:45 am - 2:45 pmHRL-STL
5h 00m1 stop
$222Southwest
Find Deal
Wed, Oct 1 - Fri, Oct 3
American Airlines Logo
5:14 am - 9:50 amSTL-HRL
4h 36m1 stop
American Airlines Logo
5:48 am - 9:57 amHRL-STL
4h 09m1 stop
$228American Airlines
Find Deal
Tue, Jan 13 - Fri, Jan 16
United Airlines Logo
12:25 pm - 9:16 pmSTL-HRL
8h 51m2 stops
United Airlines Logo
7:00 am - 3:46 pmHRL-STL
8h 46m2 stops
$240United Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
Southwest Logo
11:25 am - 6:00 pmSTL-HRL
6h 35m1 stop
Southwest Logo
5:30 pm - 10:55 pmHRL-STL
5h 25m2 stops
$262Southwest
Find Deal
Tue, Jan 13 - Fri, Jan 16
United Airlines Logo
4:45 pm - 9:54 pmSTL-HRL
5h 09m1 stop
United Airlines Logo
5:00 am - 12:27 pmHRL-STL
7h 27m2 stops
$309United Airlines
Find Deal
Tue, Dec 16 - Mon, Dec 29
United Airlines Logo
6:30 am - 3:59 pmSTL-HRL
9h 29m2 stops
United Airlines Logo
5:00 am - 12:27 pmHRL-STL
7h 27m2 stops
$314United Airlines
Find Deal
Tue, Dec 16 - Mon, Dec 29
American Airlines Logo
7:41 pm - 11:55 pmSTL-HRL
4h 14m1 stop
American Airlines Logo
6:30 pm - 11:14 pmHRL-STL
4h 44m1 stop
$339American Airlines
Find Deal
Thu, Aug 14 - Mon, Aug 18

American Airlines flights from St. Louis to Harlingen, Texas

Our best American Airlines deals on St. Louis to Harlingen, Texas flight tickets
American Airlines
Oct 25
STL5:20 amLambert-St Louis
4h 18m
1 stop
HRL9:38 amHarlingen Valley Intl
Nov 1
HRL10:08 amHarlingen Valley Intl
6h 15m
1 stop
STL4:23 pmLambert-St Louis
$197
Find similar
American Airlines
Oct 25
STL5:20 amLambert-St Louis
4h 18m
1 stop
HRL9:38 amHarlingen Valley Intl
Nov 1
HRL5:25 amHarlingen Valley Intl
10h 39m
2 stops
STL4:04 pmLambert-St Louis
$202
Find similar
American Airlines
Jan 13
STL5:14 amLambert-St Louis
4h 36m
1 stop
HRL9:50 amHarlingen Valley Intl
Jan 16
HRL5:48 amHarlingen Valley Intl
4h 09m
1 stop
STL9:57 amLambert-St Louis
$228
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 25
STL12:25 pmLambert-St Louis
8h 51m
2 stops
HRL9:16 pmHarlingen Valley Intl
Nov 1
HRL7:00 amHarlingen Valley Intl
8h 46m
2 stops
STL3:46 pmLambert-St Louis
$240
Find similar
United Airlines
Dec 16
STL4:45 pmLambert-St Louis
5h 09m
1 stop
HRL9:54 pmHarlingen Valley Intl
Dec 29
HRL5:00 amHarlingen Valley Intl
7h 27m
2 stops
STL12:27 pmLambert-St Louis
$309
Find similar
United Airlines
Dec 16
STL6:30 amLambert-St Louis
9h 29m
2 stops
HRL3:59 pmHarlingen Valley Intl
Dec 29
HRL5:00 amHarlingen Valley Intl
7h 27m
2 stops
STL12:27 pmLambert-St Louis
$314
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 July 31, 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

Sat 10/25

5:20 am-9:38 am

1 stop4h 18m

Harlingen Valley Intl

Sat 11/1

10:08 am-4:23 pm

1 stop6h 15m

$197

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sat 10/25

5:20 am-9:38 am

1 stop4h 18m

Harlingen Valley Intl

Sat 11/1

5:25 am-4:04 pm

2 stops10h 39m

$202

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 10/1

8:15 am-1:35 pm

1 stop5h 20m

Harlingen Valley Intl

Fri 10/3

9:45 am-2:45 pm

1 stop5h 00m

$217

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 10/1

2:25 pm-9:25 pm

2 stops7h 00m

Harlingen Valley Intl

Fri 10/3

9:45 am-2:45 pm

1 stop5h 00m

$222

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 1/13

5:14 am-9:50 am

1 stop4h 36m

Harlingen Valley Intl

Fri 1/16

5:48 am-9:57 am

1 stop4h 09m

$228

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sat 10/25

12:25 pm-9:16 pm

2 stops8h 51m

Harlingen Valley Intl

Sat 11/1

7:00 am-3:46 pm

2 stops8h 46m

$240

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 1/13

11:25 am-6:00 pm

1 stop6h 35m

Harlingen Valley Intl

Fri 1/16

5:30 pm-10:55 pm

2 stops5h 25m

$262

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 12/16

4:45 pm-9:54 pm

1 stop5h 09m

Harlingen Valley Intl

Mon 12/29

5:00 am-12:27 pm

2 stops7h 27m

$309

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 12/16

6:30 am-3:59 pm

2 stops9h 29m

Harlingen Valley Intl

Mon 12/29

5:00 am-12:27 pm

2 stops7h 27m

$314

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Thu 8/14

7:41 pm-11:55 pm

1 stop4h 14m

Harlingen Valley Intl

Mon 8/18

6:30 pm-11:14 pm

1 stop4h 44m

$339

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

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

Best Price Found

$99

Fastest flight time

4h 14m

Direct flights

None

Airports in Harlingen, Texas

1 airport
The best one-way flight to Harlingen, Texas from St. Louis in the past 72 hours is $99. The best round-trip flight deal from St. Louis to Harlingen, Texas found on momondo in the last 72 hours is $197.
The fastest flight from St. Louis to Harlingen, Texas takes 4h 14m
There are no direct flights from St. Louis to Harlingen, Texas. Popular non-direct route for this connection is Lambert-St Louis Airport - Harlingen Valley Intl Airport.
There is 1 airport near Harlingen, Texas: Harlingen Valley Intl (HRL)
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 14m.

  • 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
4,246 reviews
Search Southwest flights
American AirlinesPriceFrom $208Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $353Free CancellationRating
8.0
7,981 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.

An easier way to manage your Harlingen, Texas trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 8/5
Tue 8/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States