STL - HRL

$109 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 8/18. 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
$272
American Airlines
Mon 8/17Mon 8/24
STL - HRL • 1 stop
Cheapest one-way
$109
American Airlines
Tue 8/18
STL - HRL • 1 stop
Top airlines
Cheapest • from $272 (round-trip)
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
Cheapest • Avg $365 (round-trip)
Shortest trip • 4h 44m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Mon, Aug 17 - Mon, Aug 24
American Airlines Logo
5:42 am - 10:04 am
STL
-
HRL
4h 22m
1 stop
American Airlines Logo
6:43 pm - 11:42 pm
HRL
-
STL
4h 59m
1 stop
$272American Airlines
Tue, Aug 11 - Wed, Aug 19
Southwest Logo
6:00 am - 1:00 pm
STL
-
HRL
7h 00m
1 stop
Southwest Logo
1:45 pm - 5:55 pm
HRL
-
STL
4h 10m
1 stop
$286Southwest
Tue, Aug 11 - Wed, Aug 19
Southwest Logo
8:40 am - 1:00 pm
STL
-
HRL
4h 20m
1 stop
Southwest Logo
6:35 am - 1:55 pm
HRL
-
STL
7h 20m
2 stops
$291Southwest
Tue, Sep 8 - Thu, Sep 17
United Airlines Logo
11:15 am - 3:59 pm
STL
-
HRL
4h 44m
1 stop
United Airlines Logo
5:05 am - 10:10 am
HRL
-
STL
5h 05m
1 stop
$297United Airlines
Thu, Jul 30 - Tue, Aug 11
Southwest Logo
5:40 pm - 11:45 pm
STL
-
HRL
6h 05m
1 stop
Southwest Logo
3:25 pm - 8:40 pm
HRL
-
STL
5h 15m
1 stop
$312Southwest
Thu, Jul 16 - Wed, Jul 22
Southwest Logo
6:50 pm - 11:45 pm
STL
-
HRL
4h 55m
1 stop
Southwest Logo
7:05 am - 1:05 pm
HRL
-
STL
6h 00m
1 stop
$315Southwest
Tue, Jul 21 - Tue, Jul 28
Southwest Logo
8:30 am - 1:30 pm
STL
-
HRL
5h 00m
1 stop
Southwest Logo
5:00 pm - 9:10 pm
HRL
-
STL
4h 10m
1 stop
$321Southwest
Tue, Jul 21 - Tue, Jul 28
Southwest Logo
5:50 am - 1:30 pm
STL
-
HRL
7h 40m
2 stops
Southwest Logo
5:00 pm - 9:10 pm
HRL
-
STL
4h 10m
1 stop
$326Southwest
Thu, Jul 30 - Tue, Aug 11
Southwest Logo
5:35 pm - 11:45 pm
STL
-
HRL
6h 10m
2 stops
Southwest Logo
12:35 pm - 5:55 pm
HRL
-
STL
5h 20m
1 stop
$327Southwest
Thu, Jul 30 - Tue, Aug 4
Southwest Logo
5:40 pm - 11:45 pm
STL
-
HRL
6h 05m
1 stop
Southwest Logo
7:25 am - 12:40 pm
HRL
-
STL
5h 15m
1 stop
$347Southwest
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.

How much is a round-trip flight from St. Louis to Harlingen?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Harlingen departing in August.

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 July, where tickets cost $0 (return) on average. On the other hand, the most expensive months are December and May, where the average cost of round-trip tickets is $497 and $400 respectively.

Good to know

Low seasonOctober
Cheapest flight$109
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 15% 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 $109 for a one-way ticket and $272 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 $347 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 4254 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.5Entertainment
7.0Food
Airline reviews

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

4.0 OkayAnonymous, May 2026
MSY - HOU
Read more Southwest reviews

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

The seat was not comfortable. 1D. My back was sore all night and the next day.

One of the best airlines for fast boarding, on time arrivals, and top notch service!

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.

The flight from Dallas to Tokyo was not on Japan Airlines. It was on American Airlines. Very disappointed that we did not fly on Japan Airlines. Will not be using you liars again. I’ll just book direct from the airline next time. Wish you could make this right and has us fly on Japan Air when heading back home to the US.

They made nearly everyone check their bag because the overhead bins are way too small. Extremely inconvenient

It was what i expected. I like the movies you can access from your phone. It would be nice if there was a gluten free snack offered. But I did bring my own snack knowing there would not be a gluten free option

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

We got delayed getting out of DFW for broken overhead bins. Once the flight got underway the captain kept the seatbelt sign lit the entire flight despite little perceptible turbulence, preventing use of the rest rooms and any sort of refreshment service in the main cabin.

There were flight delays making our flight arrive at our destination after midnight didn’t seem to have enough crew or airplanes for the flights laid over in Dallas should’ve had plenty of time to make it to our next flight only made it because that flight was also delayed because our plane wasn’t even at the airport yet overall have not had a good experience on American

Seat comfort was poor (no lumbar or lower back support).

The passenger in front of of me reclined their seat back all the way the entire flight. Their headrest was in my face the entire flight! I barely had room for the little plastic cup of water to fit on my tray table; can you make the seats and space between the rows any smaller??? You can’t even get up to use the restroom! Worst flight I’ve had in a very long time!

My Frequent Flyer nber wasn't put on as I was told it was..... This resulted in a last group boarding and no priority tags on My bags.

Cancelled the flight half hour before boarding. Then cancelled the connecting flight too.

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

Information on your arrival and departure airports