STL - HRL

$165 Find Cheap Flights from St. Louis to Harlingen - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Harlingen departing on 10/23. 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, 0 bags

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Everything you should know

Cheapest round-trip
$305
Overall average: $216
Southwest
Sat 10/24Fri 10/30
STL - HRL • 1 stop
Cheapest one-way
$165
United Airlines
Fri 10/23
STL - HRL • 1 stop
Top airlines
Cheapest • from $305 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
Not available
There are currently no direct flights between St. Louis and Harlingen. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $365 (round-trip)
Shortest trip • 4h 43m (one-way)
Insights
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Insights
When to travel
Cheapest • 44% price drop
Most popular
Good to know
Good to know
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We hope you love your trip to Harlingen!
Flight Deals
Booking Insights
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

Sat, Oct 24 - Fri, Oct 30
Southwest Logo
5:20 am - 12:00 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
6h 40m1 stop Houston Hobby
Southwest Logo
12:55 pm - 7:05 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
6h 10m1 stop Houston Hobby
$305Southwest
Sat, Oct 24 - Fri, Oct 30
Southwest Logo
8:55 am - 2:35 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
5h 40m1 stop Dallas Love Field
Southwest Logo
6:20 am - 12:45 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
6h 25m2 stops Austin Bergstrom Dallas Love Field
$310Southwest
Sat, Oct 24 - Fri, Oct 30
American Airlines Logo
5:40 am - 10:08 amSTL  Lambert-St Louis-HRL Harlingen Valley Intl
4h 28m1 stop Dallas/Fort Worth
American Airlines Logo
2:46 pm - 9:59 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
7h 13m1 stop Dallas/Fort Worth
$322American Airlines
Sat, Oct 24 - Fri, Oct 30
Southwest Logo
8:55 am - 3:40 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
6h 45m2 stops Dallas Love Field Houston Hobby
Southwest Logo
5:30 pm - 12:35 amHRL  Harlingen Valley Intl-STL Lambert-St Louis
7h 05m2 stops Austin Bergstrom Dallas Love Field
$325Southwest
Fri, Oct 23 - Sun, Oct 25
United Airlines Logo
3:12 pm - 9:52 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
6h 40m1 stop Houston George Bush Intcntl
United Airlines Logo
5:05 am - 10:02 amHRL  Harlingen Valley Intl-STL Lambert-St Louis
4h 57m1 stop Houston George Bush Intcntl
$329United Airlines
Fri, Oct 23 - Mon, Oct 26
United Airlines Logo
3:12 pm - 7:44 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
4h 32m1 stop Houston George Bush Intcntl
United Airlines Logo
5:25 pm - 10:26 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
5h 01m1 stop Houston George Bush Intcntl
$329United Airlines
Fri, Oct 23 - Mon, Oct 26
Southwest Logo
5:10 am - 11:20 amSTL  Lambert-St Louis-HRL Harlingen Valley Intl
6h 10m2 stops Dallas Love Field Austin Bergstrom
Southwest Logo
6:35 pm - 10:25 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
3h 50m1 stop Houston Hobby
$334Southwest
Sat, Oct 24 - Fri, Oct 30
American Airlines Logo
12:46 pm - 6:12 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
5h 26m1 stop Dallas/Fort Worth
American Airlines Logo
2:46 pm - 9:18 amHRL  Harlingen Valley Intl-STL Lambert-St Louis
18h 32m1 stop Dallas/Fort Worth
$342American Airlines
Sat, Oct 24 - Fri, Oct 30
American Airlines Logo
5:00 am - 2:16 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
9h 16m2 stops Chicago O'Hare Intl Dallas/Fort Worth
American Airlines Logo
2:46 pm - 9:59 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
7h 13m1 stop Dallas/Fort Worth
$385American Airlines
Wed, Sep 16 - Sat, Sep 19
United Airlines Logo
11:15 am - 3:59 pmSTL  Lambert-St Louis-HRL Harlingen Valley Intl
4h 44m1 stop Houston George Bush Intcntl
United Airlines Logo
7:15 am - 2:15 pmHRL  Harlingen Valley Intl-STL Lambert-St Louis
7h 00m1 stop Houston George Bush Intcntl
$387United Airlines
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 is the cheapest month to fly from St. Louis to Harlingen?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Harlingen, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Harlingen is October, where tickets cost $216 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is $499 and $497 respectively.

Good to know

Low season

May

Cheapest flight

$165
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 5% 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 5 days, the lowest price for a flight from St. Louis to Harlingen was $165 for a one-way ticket and $305 for a round-trip.

  • 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 is the only airline alliance operating flights between St. Louis and Harlingen.

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Harlingen are Southwest and American Airlines. With an average price for the route of $417 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $390 and an overall rating of 7.1.

  • 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 airlines flying 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 4220 reviews
8.0Comfort
8.6Crew
7.5Entertainment
7.0Food
8.1Boarding
Airline reviews

Exceptional. The gate crew responded quickly and got me onto this earlier flight as the final passenger, saving me more than four hours of wait time for my reserved flight.

10.0 ExcellentAnonymous, Aug 2026
Read more Southwest reviews

Exceptional. The gate crew responded quickly and got me onto this earlier flight as the final passenger, saving me more than four hours of wait time for my reserved flight.

The flight was delayed due to earlier issues at other airports. The crew was excellent & made it a good trip.

Snacks are always pretzels. Why can't you also offer peanuts ?

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

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

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

The flight was promptly on schedule and Southwest delivered everything they promised. No excuses for any shortfalls just 100% ownership of their responsibilities and business. The boarding and seating policy is a complete shambles. What started out as a great idea when Southwest first hit the market has been turned into a disaster due to the lack of integrity in many of the people who fly Southwest and take advantage of Southwest generosity at the expense of their fellow passengers.

Crew was excellent - Plane was fine. Media was good, could use more kid shows; Not a fan of the brownie brittle -- snack could be slightly better.

Left on time and arrived early. Brand new plane and no parts missing. Comfortable seats. The actual Captain spoke prior to the flight and reassured everyone about safety. Crew was so nice and fun. Perfect flight!

Everything went smoothly and the plane wasn’t full. It was delayed though. The delay was increased due to a crew change which was frustrating.

My luggage was not sent with us. Not sure if this is Envoy Air responsibility but that was a very BAD experience

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

No enough space plus only allowing one laggage instead of two like other airlines.

Qatar airways ,boarding arrangements at Hamid international airport could been better

Two flight changes before the scheduled flight. On the day of the flight, the flight was delayed, which caused the connecting flight to be missed. Then, I was directed to another airport (CUN) and traveled to Tulum. American gave a $12 voucher for lunch. The least expensive item on the menu at a Mexican restaurant was $9.99. Driving to Tulum was a bad auto crash, and traffic was delayed two-plus hours. The bottom line is that we should have been at the hotel at noon, but it ended up at 11:30 PM.

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

First time flying internationally with AA and probably my last. Not military friendly at all. Didn't allow free checked bag for military family members (dependents) on orders like other airlines. We were charged $100 for baggage weight overage (5 lbs!)even though we had military orders allowing us extra.. Didn’t allow military members to board early. Inefficient and long wait time to board. Seats are smaller and more uncomfortable than other airlines.. no drink service for over 7 hrs of flight! After initial meal was served, the crew never offered a snack or drinks until the breakfast's was served 1 1/2 hrs before landing. Overall expensive and poor experience for the entire flight.

Boarding process was good. I was assigned the most rear (non-reclining) seat in both directions, which wasn't great.

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

Information on your arrival and departure airports