Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Harlingen from $213

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 1/13. 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

Enter your travel dates to find the best prices.
Southwest Logo
6:00 am - 10:15 am
STL
-
HRL
4h 15m1 stop
Southwest Logo
10:45 am - 5:00 pm
HRL
-
STL
6h 15m1 stop
$213Southwest
Tue, Jan 13 - Sat, Jan 17
United Airlines Logo
11:20 am - 9:59 pm
STL
-
HRL
10h 39m2 stops
United Airlines Logo
5:25 pm - 10:00 pm
HRL
-
STL
4h 35m1 stop
$228United Airlines
Tue, Jan 13 - Sat, Jan 17
United Airlines Logo
6:00 am - 11:26 am
STL
-
HRL
5h 26m1 stop
United Airlines Logo
5:25 pm - 10:00 pm
HRL
-
STL
4h 35m1 stop
$249United Airlines
Sun, Jan 18 - Sun, Jan 25
United Airlines Logo
11:20 am - 9:59 pm
STL
-
HRL
10h 39m2 stops
United Airlines Logo
5:25 pm - 10:00 pm
HRL
-
STL
4h 35m1 stop
$254United Airlines
Sun, Jan 18 - Sun, Jan 25
United Airlines Logo
10:07 am - 4:06 pm
STL
-
HRL
5h 59m1 stop
United Airlines Logo
9:20 am - 3:39 pm
HRL
-
STL
6h 19m1 stop
$283United Airlines
Wed, Jan 28 - Sat, Jan 31
United Airlines Logo
8:05 am - 8:01 pm
STL
-
HRL
11h 56m2 stops
United Airlines Logo
9:20 am - 3:39 pm
HRL
-
STL
6h 19m1 stop
$288United Airlines
Wed, Jan 28 - Sat, Jan 31
United Airlines Logo
6:00 am - 11:26 am
STL
-
HRL
5h 26m1 stop
United Airlines Logo
9:20 am - 3:39 pm
HRL
-
STL
6h 19m1 stop
$293United Airlines
Wed, Jan 28 - Sat, Jan 31
Southwest Logo
11:25 am - 6:00 pm
STL
-
HRL
6h 35m1 stop
Southwest Logo
5:45 am - 9:50 am
HRL
-
STL
4h 05m1 stop
$294Southwest
Tue, Feb 24 - Sun, Mar 1
American Airlines Logo
11:05 am - 11:21 pm
STL
-
HRL
12h 16m2 stops
American Airlines Logo
6:02 am - 1:09 pm
HRL
-
STL
7h 07m2 stops
$296American Airlines
Tue, Jan 13 - Sat, Jan 17
United Airlines Logo
6:30 am - 4:06 pm
STL
-
HRL
9h 36m2 stops
United Airlines Logo
9:20 am - 3:39 pm
HRL
-
STL
6h 19m1 stop
$298United Airlines
Wed, Jan 28 - Sat, Jan 31

United Airlines flights from St. Louis to Harlingen, Texas

Our best United Airlines deals on St. Louis to Harlingen, Texas flight tickets
United Airlines
Jan 13
STL11:20 amLambert-St Louis
10h 39m
2 stops
HRL9:59 pmHarlingen Valley Intl
Jan 17
HRL5:25 pmHarlingen Valley Intl
4h 35m
1 stop
STL10:00 pmLambert-St Louis
$228
Find similar
United Airlines
Jan 18
STL6:00 amLambert-St Louis
5h 26m
1 stop
HRL11:26 amHarlingen Valley Intl
Jan 25
HRL5:25 pmHarlingen Valley Intl
4h 35m
1 stop
STL10:00 pmLambert-St Louis
$249
Find similar
United Airlines
Jan 18
STL11:20 amLambert-St Louis
10h 39m
2 stops
HRL9:59 pmHarlingen Valley Intl
Jan 25
HRL5:25 pmHarlingen Valley Intl
4h 35m
1 stop
STL10:00 pmLambert-St Louis
$254
Find similar

Southwest flights from St. Louis to Harlingen, Texas

Our best Southwest deals on St. Louis to Harlingen, Texas flight tickets
Southwest
Jan 13
STL6:00 amLambert-St Louis
4h 15m
1 stop
HRL10:15 amHarlingen Valley Intl
Jan 17
HRL10:45 amHarlingen Valley Intl
6h 15m
1 stop
STL5:00 pmLambert-St Louis
$213
Find similar
Southwest
Feb 24
STL11:25 amLambert-St Louis
6h 35m
1 stop
HRL6:00 pmHarlingen Valley Intl
Mar 1
HRL5:45 amHarlingen Valley Intl
4h 05m
1 stop
STL9:50 amLambert-St Louis
$294
Find similar
Southwest
Feb 24
STL10:15 amLambert-St Louis
7h 45m
2 stops
HRL6:00 pmHarlingen Valley Intl
Mar 1
HRL5:45 amHarlingen Valley Intl
4h 05m
1 stop
STL9:50 amLambert-St Louis
$299
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 December 23, 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

Tue 1/13

6:00 am-10:15 am

1 stop4h 15m

Harlingen Valley Intl

Sat 1/17

10:45 am-5:00 pm

1 stop6h 15m

$213

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 1/13

11:20 am-9:59 pm

2 stops10h 39m

Harlingen Valley Intl

Sat 1/17

5:25 pm-10:00 pm

1 stop4h 35m

$228

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sun 1/18

6:00 am-11:26 am

1 stop5h 26m

Harlingen Valley Intl

Sun 1/25

5:25 pm-10:00 pm

1 stop4h 35m

$249

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Sun 1/18

11:20 am-9:59 pm

2 stops10h 39m

Harlingen Valley Intl

Sun 1/25

5:25 pm-10:00 pm

1 stop4h 35m

$254

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 1/28

10:07 am-4:06 pm

1 stop5h 59m

Harlingen Valley Intl

Sat 1/31

9:20 am-3:39 pm

1 stop6h 19m

$283

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 1/28

8:05 am-8:01 pm

2 stops11h 56m

Harlingen Valley Intl

Sat 1/31

9:20 am-3:39 pm

1 stop6h 19m

$288

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 1/28

6:00 am-11:26 am

1 stop5h 26m

Harlingen Valley Intl

Sat 1/31

9:20 am-3:39 pm

1 stop6h 19m

$293

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 2/24

11:25 am-6:00 pm

1 stop6h 35m

Harlingen Valley Intl

Sun 3/1

5:45 am-9:50 am

1 stop4h 05m

$294

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 1/13

11:05 am-11:21 pm

2 stops12h 16m

Harlingen Valley Intl

Sat 1/17

6:02 am-1:09 pm

2 stops7h 07m

$296

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 1/28

6:30 am-4:06 pm

2 stops9h 36m

Harlingen Valley Intl

Sat 1/31

9:20 am-3:39 pm

1 stop6h 19m

$298

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 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.

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

You could potentially save up to 31% 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 26m

Direct flights

None
The fastest flight from St. Louis to Harlingen, Texas takes 5h 26m
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 26m.

  • 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
4,253 reviews
Search Southwest flights
American AirlinesPriceFrom $228Free CancellationRating
7.2
11,054 reviews
Search American 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.

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
Thu 1/22
Thu 1/29
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States