STL - HRL

$279 Find Cheap Flights from St. Louis to Harlingen

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Harlingen departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Harlingen

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Harlingen, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Harlingen, as well as popular online travel agencies
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Flight Deals

Cheap Flights from St. Louis to Harlingen (STL-HRL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Harlingen that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Harlingen

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
10:45 am - 6:00 pmHRL-STL
7h 15m2 stops
$285Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 6
American Airlines Logo
5:18 am - 9:41 amSTL-HRL
4h 23m1 stop
American Airlines Logo
6:20 pm - 11:49 pmHRL-STL
5h 29m1 stop
$289American Airlines
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
Sun, Sep 21 - Tue, Sep 23
Southwest Logo
5:35 am - 9:40 amSTL-HRL
4h 05m1 stop
Southwest Logo
11:15 am - 4:00 pmHRL-STL
4h 45m1 stop
$389Southwest
Find Deal
Sun, Sep 21 - Tue, Sep 23
Southwest Logo
5:35 am - 9:40 amSTL-HRL
4h 05m1 stop
Southwest Logo
12:20 pm - 5:50 pmHRL-STL
5h 30m2 stops
$394Southwest
Find Deal
Tue, Sep 30 - Fri, Oct 3
United Airlines Logo
6:15 am - 1:19 pmSTL-HRL
7h 04m1 stop
United Airlines Logo
5:17 pm - 10:00 pmHRL-STL
4h 43m1 stop
$405United Airlines
Find Deal
Tue, Sep 30 - Fri, Oct 3
United Airlines Logo
11:06 am - 4:13 pmSTL-HRL
5h 07m1 stop
United Airlines Logo
5:00 am - 12:28 pmHRL-STL
7h 28m2 stops
$410United Airlines
Find Deal
Tue, Sep 30 - Fri, Oct 3
United Airlines Logo
12:25 pm - 11:18 pmSTL-HRL
10h 53m2 stops
United Airlines Logo
5:00 am - 12:28 pmHRL-STL
7h 28m2 stops
$415United Airlines
Find Deal

Everything you should know

Top airlines
Southwest
Cheapest • from $279 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$279
Southwest
Fri 10/3Mon 10/6
STL - HRL • 1 stop
Cheapest one-way
Multiple Airlines
Thu 9/18
STL - HRL • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Harlingen!
Booking Insights

KAYAK's insights & trends for St. Louis to Harlingen flights

Get data-powered insights and trends into flights from St. Louis to Harlingen to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Harlingen?

The average price of all round-trip flights from St. Louis to Harlingen clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Harlingen on a Monday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from St. Louis to Harlingen. For your return ticket, we recommend flying on a Thursday and avoiding Fridays for the best deals.

Good to know

Low seasonMay
Cheapest flight$279
Best time to beat the crowds with an average 41% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from St. Louis to Harlingen

When to book flights from St. Louis to Harlingen

Are your dates flexible? Find out the best times to travel from St. Louis to Harlingen based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Harlingen

  • What is the cheapest flight from St. Louis to Harlingen?

    In the last 3 days, the lowest price for a flight from St. Louis to Harlingen was $279 for a round-trip ticket.

  • Do I need a passport to fly between St. Louis and Harlingen?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from St. Louis to Harlingen?

    St. Louis and Harlingen are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Harlingen Valley Intl.

  • Which aircraft models fly most regularly from St. Louis to Harlingen?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Harlingen?

    oneworld, and Star Alliance are the airline alliances operating flights between St. Louis and Harlingen, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Harlingen, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to Harlingen are Southwest and Delta. With an average price for the route of $313 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $421 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from St. Louis to Harlingen?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Harlingen.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Harlingen?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Harlingen from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Harlingen?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Harlingen with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and HRL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Harlingen?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Harlingen from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from St. Louis to Harlingen

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Harlingen. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Harlingen? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4242 reviews
7.5Entertainment
8.0Comfort
8.6Crew
7.0Food
8.1Boarding
Airline reviews

Very good. Sad to learn Southwest is going start to charge for bags

10.0 ExcellentRoxann, Mar 2025STL - LAS
Read more Southwest reviews

Very good. Sad to learn Southwest is going start to charge for bags

Multiple delays and gate changes. Arrived at final destination 6 hours late. All rental cars had been taken.

The movies using Southwest WiFi kept pausing and I had to restart multiple times.

First, my flight was a usual flight nothing exceptional or unexpected. Over all it was a normal, good flight! Second, your questionaire is wholly lacking in the proper options to which one can answer a question. Often on short flights, there is no food let alone entertainment so why isn't that reflected in your questionaire? A simple "not applicable" would cover that issue appropriately but no, your form arbitrarily enters an answer based on the initial assessment which normally isn't factual. Until you provide an accurate means of assessing flights, I'll no longer be completing of these unimpressive and misleading assessements. Thank you!

Easy to book and to get check in and get on and off.

It seems as though the provisions are even less. Although SWA used to be an economy Airline, that isn't really the case anymore. I paid over $700. for a round trip to Denver and I could have flown just about any airline for the price. The drinks are now in a 6-ounce cup and with ice I'm sure a can would fill more than 2 cups. However, I am very proud of SWA for using paper rather than continuing to contribute to the millions of plastic cups being used each day. I've thought of this fr many years and am so glad to see it come to fruition, if not by only SWA so far.

Exceptional crew! Friendly and professional. Pleasant attitude and treated everyone with respect.

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

Everything worked well. Crew was as entertaining as is possible on a plane flight. Southwest still has good legroom:

Crew was great - friendly and helpful with boarding - letting folks know where overhead space was available thus getting us out of the gate on time.

The staff and the boarding procedure were all amazing . The one flight was not equipped with WIFI which now adays seems odd. All in all the experience was good

Perfect flight both ways. On time, courteous staff, plane comfortable and cool. Best domestic flights I’ve had in awhile.

Really low quality food especially for an international flight. The crew also was surprisingly unpleasant except couple of ladies. I know we were not in first class but that’s no reason to treat customers as less.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

Crew was good. The reservation got mixed up and they didn't have my TSA number. I am also a Silver Medallion and wasn't able to use Sky Priority.

Delta made it easy, comfortable and timely. The crew was fantastic.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Three seats in first class were broken and while they were able to still acommodate us it was looking very touch and go and they had others they could not acommodate

Mechanic delay in addition to a 2 hour change in takeoff time was frustrating.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

There's nothing I liked about it. For first off I scheduled this trip two weeks in advance then they delayed my flight which messed up my whole trip. So I scheduled it for the following weekend thinking there won't be a delay and guess what as soon as I got to the airport we said in the airplane on the tarmac for an hour and a half. Not only was it delayed I missed my connecting flight meaning I had to stay the night at Dallas-Fort Worth airport sleeping on the floor. I will tell you this I will never fly American airlines ever again I have had nothing but horrible experience with them and I just throw money at them

Having to reschedule flights a day later, they loaded by luggage on the wrong plane from Little rock now I have to HOPE they deliver it to where im staying like they said would. International flight crew was very disgruntled and not very friendly.

The entertainment package was vast and the selections were very current. Keep updating it was great.

Great flight. No issues at all. I still think boarding could be more efficient but otherwise, a good experience.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

Delayed flight, so I switched fights to SFO to Phoenix , Phoenix to DSM. Excellent service through American Airlines

The AA app really sucks ... Every flight & connecting flights were delayed over 30 mins. One connecting flight on American Eagle said it was delayed in its arrival ... when it was actually parked across from the gate for over 1 hr before they pulled it to the gate. Seats in the economy/ main cabin are packed together like sardines ... no leg room.

The flight delay in Dallas created a domino effect that impacted all connecting flights, leading to an increase in the number of connections. As a result, I missed my flight from Casablanca to Marrakech due to the tight turnaround when landing in Casablanca. CMN Airport was understaffed; only one employee was available to assist passengers while others just stood by and watched. It was an extremely frustrating situation. Many passengers were crying and banging their hands on the counter while talking to customer service representative Allabough. Unfortunately, Allabough couldn’t change my flight in the system. At the same time, I was on the phone with an American Airlines customer service representative named Solomon, who said he couldn’t make the change either. So, I decided to take an ONYA Voyages train from Casablanca to Marrakech to reach my destination on Friday, June 26. It turned out to be an unpredictable trip.

Everything you need to know for your flight from St. Louis to Harlingen

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