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Cheap flights from St. Louis to Harlingen from $104

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 1/14. 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
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.
United Airlines Logo
6:00 am - 11:26 amSTL-HRL
5h 26m1 stop
United Airlines Logo
9:20 am - 3:52 pmHRL-STL
6h 32m1 stop
$207United Airlines
Find Deal
mié., ene. 14 - mar., ene. 20
United Airlines Logo
8:30 am - 8:01 pmSTL-HRL
11h 31m2 stops
United Airlines Logo
5:25 pm - 10:00 pmHRL-STL
4h 35m1 stop
$212United Airlines
Find Deal
mié., ene. 14 - mar., ene. 20
American Airlines Logo
5:17 am - 9:43 amSTL-HRL
4h 26m1 stop
American Airlines Logo
6:10 pm - 10:47 pmHRL-STL
4h 37m1 stop
$258American Airlines
Find Deal
jue., nov. 20 - mié., dic. 3
United Airlines Logo
11:20 am - 9:59 pmSTL-HRL
10h 39m2 stops
United Airlines Logo
12:10 pm - 11:59 pmHRL-STL
11h 49m2 stops
$287United Airlines
Find Deal
mié., ene. 14 - mar., ene. 20
Delta Logo
6:30 am - 2:29 pmSTL-HRL
7h 59m1 stop
Delta Logo
3:00 pm - 11:10 pmHRL-STL
8h 10m1 stop
$293Delta
Find Deal
mar., mar. 24 - mié., mar. 25
United Airlines Logo
11:25 am - 9:44 pmSTL-HRL
10h 19m2 stops
United Airlines Logo
5:16 pm - 10:13 pmHRL-STL
4h 57m1 stop
$324United Airlines
Find Deal
mar., mar. 24 - mié., mar. 25
American Airlines Logo
5:17 am - 9:51 amSTL-HRL
4h 34m1 stop
American Airlines Logo
5:40 am - 10:39 amHRL-STL
4h 59m1 stop
$344American Airlines
Find Deal
mié., nov. 19 - dom., nov. 23
Delta Logo
6:00 am - 2:43 pmSTL-HRL
8h 43m1 stop
Delta Logo
3:39 pm - 11:22 pmHRL-STL
7h 43m1 stop
$346Delta
Find Deal
sáb., nov. 15 - sáb., nov. 22
Southwest Logo
5:45 am - 9:55 amSTL-HRL
4h 10m1 stop
Southwest Logo
7:30 am - 5:25 pmHRL-STL
9h 55m2 stops
$369Southwest
Find Deal
jue., nov. 20 - mié., dic. 3
Southwest Logo
1:45 pm - 9:20 pmSTL-HRL
7h 35m2 stops
Southwest Logo
11:35 am - 7:55 pmHRL-STL
8h 20m2 stops
$456Southwest
Find Deal
sáb., nov. 15 - sáb., nov. 22

Delta flights from St. Louis to Harlingen, Texas

Our best Delta deals on St. Louis to Harlingen, Texas flight tickets
Delta
Mar 24
STL6:30 amLambert-St Louis
7h 59m
1 stop
HRL2:29 pmHarlingen Valley Intl
Mar 25
HRL3:00 pmHarlingen Valley Intl
8h 10m
1 stop
STL11:10 pmLambert-St Louis
$293
Find similar
Delta
Nov 15
STL6:00 amLambert-St Louis
8h 43m
1 stop
HRL2:43 pmHarlingen Valley Intl
Nov 22
HRL3:39 pmHarlingen Valley Intl
7h 43m
1 stop
STL11:22 pmLambert-St Louis
$346
Find similar
Delta
Dec 23
STL6:05 amLambert-St Louis
8h 15m
1 stop
HRL2:20 pmHarlingen Valley Intl
Dec 28
HRL3:15 pmHarlingen Valley Intl
7h 01m
1 stop
STL10:16 pmLambert-St Louis
$448
Find similar

American Airlines flights from St. Louis to Harlingen, Texas

Our best American Airlines deals on St. Louis to Harlingen, Texas flight tickets
American Airlines
Nov 20
STL5:17 amLambert-St Louis
4h 26m
1 stop
HRL9:43 amHarlingen Valley Intl
Dec 3
HRL6:10 pmHarlingen Valley Intl
4h 37m
1 stop
STL10:47 pmLambert-St Louis
$258
Find similar
American Airlines
Nov 19
STL5:17 amLambert-St Louis
4h 34m
1 stop
HRL9:51 amHarlingen Valley Intl
Nov 23
HRL5:40 amHarlingen Valley Intl
4h 59m
1 stop
STL10:39 amLambert-St Louis
$344
Find similar
American Airlines
Nov 19
STL6:00 amLambert-St Louis
9h 32m
2 stops
HRL3:32 pmHarlingen Valley Intl
Nov 23
HRL5:40 amHarlingen Valley Intl
4h 59m
1 stop
STL10:39 amLambert-St Louis
$384
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 noviembre 5, 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

mié. 1/14

6:00 am-11:26 am

1 stop5h 26m

Harlingen Valley Intl

mar. 1/20

9:20 am-3:52 pm

1 stop6h 32m

$207

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mié. 1/14

8:30 am-8:01 pm

2 stops11h 31m

Harlingen Valley Intl

mar. 1/20

5:25 pm-10:00 pm

1 stop4h 35m

$212

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

jue. 11/20

5:17 am-9:43 am

1 stop4h 26m

Harlingen Valley Intl

mié. 12/3

6:10 pm-10:47 pm

1 stop4h 37m

$258

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mié. 1/14

11:20 am-9:59 pm

2 stops10h 39m

Harlingen Valley Intl

mar. 1/20

12:10 pm-11:59 pm

2 stops11h 49m

$287

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mar. 3/24

6:30 am-2:29 pm

1 stop7h 59m

Harlingen Valley Intl

mié. 3/25

3:00 pm-11:10 pm

1 stop8h 10m

$293

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mar. 3/24

11:25 am-9:44 pm

2 stops10h 19m

Harlingen Valley Intl

mié. 3/25

5:16 pm-10:13 pm

1 stop4h 57m

$324

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

mié. 11/19

5:17 am-9:51 am

1 stop4h 34m

Harlingen Valley Intl

dom. 11/23

5:40 am-10:39 am

1 stop4h 59m

$344

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

sáb. 11/15

6:00 am-2:43 pm

1 stop8h 43m

Harlingen Valley Intl

sáb. 11/22

3:39 pm-11:22 pm

1 stop7h 43m

$346

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

jue. 11/20

5:45 am-9:55 am

1 stop4h 10m

Harlingen Valley Intl

mié. 12/3

7:30 am-5:25 pm

2 stops9h 55m

$369

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

sáb. 11/15

1:45 pm-9:20 pm

2 stops7h 35m

Harlingen Valley Intl

sáb. 11/22

11:35 am-7:55 pm

2 stops8h 20m

$456

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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

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 32% 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

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 10m.

  • 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
4,240 reviews
Search Southwest flights
American AirlinesPriceFrom $221Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights
DeltaPriceFrom $353Free CancellationRating
7.9
8,004 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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