STL - HRL

$155 Find Cheap Flights from St. Louis to Harlingen

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 6/16. 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

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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Everything you should know

Cheapest round-trip
$229
Southwest
Wed 5/13Wed 5/20
STL - HRL • 1 stop
Cheapest one-way
$155
Southwest
Tue 6/16
STL - HRL • 1 stop
Top airlines
Southwest
Cheapest • from $229 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Harlingen. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Houston (IAH)
Cheapest • Avg $365 (round-trip)
Dallas (DFW)
Shortest trip • 4h 40m (one-way)
Insights
Insights
Insights
Insights
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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!
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

Wed, May 13 - Wed, May 20
Southwest Logo
4:25 pm - 10:00 pm
STL
-
HRL
5h 35m
1 stop
Southwest Logo
4:40 pm - 10:20 pm
HRL
-
STL
5h 40m
1 stop
$229Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
2:30 pm - 10:00 pm
STL
-
HRL
7h 30m
2 stops
Southwest Logo
4:40 pm - 10:20 pm
HRL
-
STL
5h 40m
1 stop
$234Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
4:25 pm - 10:00 pm
STL
-
HRL
5h 35m
1 stop
Southwest Logo
4:40 pm - 10:20 pm
HRL
-
STL
5h 40m
1 stop
$257Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
8:25 am - 4:00 pm
STL
-
HRL
7h 35m
2 stops
Southwest Logo
4:40 pm - 10:20 pm
HRL
-
STL
5h 40m
1 stop
$262Southwest
Mon, Mar 30 - Mon, Mar 30
United Airlines Logo
6:00 am - 11:23 am
STL
-
HRL
5h 23m
1 stop
United Airlines Logo
5:18 pm - 10:28 pm
HRL
-
STL
5h 10m
1 stop
$279United Airlines
Thu, Mar 26 - Mon, Mar 30
Southwest Logo
6:30 pm - 12:05 am
STL
-
HRL
5h 35m
1 stop
Southwest Logo
6:25 pm - 12:05 am
HRL
-
STL
5h 40m
1 stop
$280Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
2:30 pm - 10:00 pm
STL
-
HRL
7h 30m
2 stops
Southwest Logo
10:45 am - 6:00 pm
HRL
-
STL
7h 15m
2 stops
$289Southwest
Tue, Apr 14 - Wed, Apr 15
United Airlines Logo
6:00 am - 11:23 am
STL
-
HRL
5h 23m
1 stop
United Airlines Logo
5:18 pm - 10:28 pm
HRL
-
STL
5h 10m
1 stop
$299United Airlines
Tue, Apr 14 - Wed, Apr 15
United Airlines Logo
6:30 am - 4:04 pm
STL
-
HRL
9h 34m
2 stops
United Airlines Logo
5:18 pm - 10:28 pm
HRL
-
STL
5h 10m
1 stop
$304United Airlines
Tue, Apr 14 - Wed, Apr 15
United Airlines Logo
6:00 am - 11:23 am
STL
-
HRL
5h 23m
1 stop
United Airlines Logo
5:18 pm - 10:28 pm
HRL
-
STL
5h 10m
1 stop
$307United 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.

Which airlines provide the cheapest flights from St. Louis to Harlingen?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from St. Louis to Harlingen were found on Southwest ($229) and United Airlines ($279).

Find deals

Good to know

Low seasonMay
Cheapest flight$155
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly with an average 25% 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 $155 for a one-way ticket and $229 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 $362 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 4318 reviews
8.6Crew
7.5Entertainment
8.1Boarding
7.0Food
8.0Comfort
Airline reviews

I elected to pay for the upgrades and found very little difference

6.0 GoodChris, Mar 2026
DAL - SAT
Read more Southwest reviews

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

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

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

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

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

No delays and arrived to destination 30 min early. Staff was super friendly.

Everything a cheap airline should be at normal airline rates.

Where do I start!! I was delayed with my flight from Dallas to Tampa. On the way back from Tampa to Dallas the flight was delayed over 4 hours+. I was put on another flight that was also delayed but not as long. Traveling on American Airlines is becoming exhausing.

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

The flight attendants and the service is getting worse by the day.

They are rarely on time! Very hard to plan your travels when flights or connections keep getting delayed.

Forced to check bags. Crew uninterested in collecting trash. Unclean seats.

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.

Mediocre would be best description. Food bland. Seat biz class uncomfortable to sleep. Crew never dimmed lights completely in an overnight flight to Europe. Would avoid AA if possible.

Massimo, flight attendant was very authentic, attentive - wonderful. Food/wrap was just okay.

I am an AA flyer for a very long time... AA has yet to disappoint.

Arriving plane went to wrong gate. Flight Attendant was late. Was in no Hurry when he arrived. Flight was fine. Plane had to wait 20 minutes to get assigned a gate due to designated gate tied up. barely connected.. Boarded extremely late on final leg of trip.

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

Information on your arrival and departure airports

St. Louis (STL)
Harlingen (HRL)