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 3/17. 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
$279
Typical prices: $288-$369
American Airlines
Tue 2/10Wed 2/18
STL - HRL • 1 stop
Cheapest one-way
$115
American Airlines
Tue 3/17
STL - HRL • 1 stop
Top airlines
American Airlines
Cheapest • from $279 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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

Tue, Feb 10 - Wed, Feb 18
American Airlines Logo
12:03 pm - 6:14 pm
STL
-
HRL
6h 11m
1 stop
American Airlines Logo
6:46 pm - 11:22 pm
HRL
-
STL
4h 36m
1 stop
$279American Airlines
Tue, Feb 10 - Wed, Feb 18
American Airlines Logo
6:00 am - 6:14 pm
STL
-
HRL
12h 14m
2 stops
American Airlines Logo
6:46 pm - 11:22 pm
HRL
-
STL
4h 36m
1 stop
$299American Airlines
Fri, Feb 6 - Sun, Feb 8
United Airlines Logo
6:00 am - 11:26 am
STL
-
HRL
5h 26m
1 stop
United Airlines Logo
5:25 pm - 10:00 pm
HRL
-
STL
4h 35m
1 stop
$309United Airlines
Fri, Feb 6 - Tue, Feb 10
American Airlines Logo
5:04 pm - 11:21 pm
STL
-
HRL
6h 17m
1 stop
American Airlines Logo
11:06 am - 4:14 pm
HRL
-
STL
5h 08m
1 stop
$319American Airlines
Wed, Mar 18 - Sun, Mar 22
Southwest Logo
4:05 pm - 9:25 pm
STL
-
HRL
5h 20m
1 stop
Southwest Logo
5:30 am - 11:50 am
HRL
-
STL
6h 20m
1 stop
$349Southwest
Fri, Feb 6 - Tue, Feb 10
United Airlines Logo
6:00 am - 11:26 am
STL
-
HRL
5h 26m
1 stop
United Airlines Logo
12:10 pm - 10:58 pm
HRL
-
STL
10h 48m
2 stops
$351United Airlines
Wed, Mar 18 - Sun, Mar 22
Southwest Logo
2:25 pm - 9:25 pm
STL
-
HRL
7h 00m
2 stops
Southwest Logo
5:30 am - 11:50 am
HRL
-
STL
6h 20m
1 stop
$374Southwest
Thu, Feb 12 - Mon, Feb 16
American Airlines Logo
5:12 am - 10:12 am
STL
-
HRL
5h 00m
1 stop
American Airlines Logo
6:46 pm - 11:22 pm
HRL
-
STL
4h 36m
1 stop
$375American Airlines
Fri, Feb 6 - Sun, Feb 8
American Airlines Logo
5:04 pm - 11:21 pm
STL
-
HRL
6h 17m
1 stop
American Airlines Logo
6:02 am - 1:03 pm
HRL
-
STL
7h 01m
2 stops
$405American Airlines
Thu, Feb 12 - Mon, Feb 16
Southwest Logo
3:15 pm - 10:10 pm
STL
-
HRL
6h 55m
1 stop
Southwest Logo
9:45 am - 9:55 pm
HRL
-
STL
12h 10m
2 stops
$425Southwest
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, Texas?

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, Texas departing in February.
Find deals

Good to know

Low seasonMay
Cheapest flight$115
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 8% 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 $279 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 $309 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 $372 and an overall rating of 7.2.

  • 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 4268 reviews
7.5Entertainment
8.0Comfort
8.1Boarding
8.6Crew
7.0Food
Airline reviews

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

10.0 ExcellentPieter, Jan 2026
LGB - DAL
Read more Southwest reviews

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.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

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.

2 hour delay due to equipment failure. No updates via the app and airport screens (which continued to show a departure time in the past). AA eventually switched planes and the new plane was not catered or cleaned correctly.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

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

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

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

They made me pay $40 to check a bag that was listed as free when I bought my ticket. Then before boarding they offered to check any bags free.

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

The seats from lax to DFW was so tight that I could not move my legs . No WiFi and had to pay . Not a good selection of entertainment

The flight was good. We had to spend almost an hour on the tarmac when we arrived in Dallas. Waiting for a gate. What’s the point of arriving early if you have no gate to park at?

Lower WiFi prices; allow us to see our flight on a map; more variety of drink choices.

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)