STL - HRL

$121 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 3/8. 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
$245
Typical prices: $333-$485
American Airlines
Mon 2/23Wed 3/4
STL - HRL • 1 stop
Cheapest one-way
$121
United Airlines
Sun 3/8
STL - HRL • 1 stop
Top airlines
American Airlines
Cheapest • from $245 (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

Mon, Feb 23 - Wed, Mar 4
American Airlines Logo
5:12 am - 10:12 am
STL
-
HRL
5h 00m
1 stop
American Airlines Logo
6:00 am - 11:01 am
HRL
-
STL
5h 01m
1 stop
$245American Airlines
Wed, Feb 18 - Wed, Feb 25
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
$268American 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
$277Southwest
Tue, Feb 24 - Sat, Feb 28
United Airlines Logo
9:55 am - 9:59 pm
STL
-
HRL
12h 04m
2 stops
United Airlines Logo
5:22 pm - 10:14 pm
HRL
-
STL
4h 52m
1 stop
$280United Airlines
Mon, Feb 23 - Wed, Mar 4
American Airlines Logo
5:12 am - 10:12 am
STL
-
HRL
5h 00m
1 stop
American Airlines Logo
2:45 pm - 11:48 pm
HRL
-
STL
9h 03m
2 stops
$288American Airlines
Wed, Feb 18 - Wed, Feb 25
Southwest Logo
11:55 am - 5:05 pm
STL
-
HRL
5h 10m
1 stop
Southwest Logo
6:30 am - 1:35 pm
HRL
-
STL
7h 05m
2 stops
$298Southwest
Mon, Feb 23 - Fri, Feb 27
American Airlines Logo
5:12 am - 10:12 am
STL
-
HRL
5h 00m
1 stop
American Airlines Logo
10:42 am - 5:13 pm
HRL
-
STL
6h 31m
1 stop
$306American Airlines
Thu, Mar 26 - Mon, Mar 30
Southwest Logo
6:30 am - 11:45 am
STL
-
HRL
5h 15m
1 stop
Southwest Logo
5:30 pm - 12:05 am
HRL
-
STL
6h 35m
2 stops
$308Southwest
Mon, Feb 23 - Fri, Feb 27
Southwest Logo
2:25 pm - 6:40 pm
STL
-
HRL
4h 15m
1 stop
Southwest Logo
9:45 am - 9:30 pm
HRL
-
STL
11h 45m
2 stops
$330Southwest
Wed, Feb 18 - Wed, Feb 25
Southwest Logo
8:55 am - 5:05 pm
STL
-
HRL
8h 10m
2 stops
Southwest Logo
6:30 am - 1:35 pm
HRL
-
STL
7h 05m
2 stops
$334Southwest
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.

Good to know

Low seasonMay
Cheapest flight$121
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 16% 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 $121 for a one-way ticket and $245 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 $378 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 4280 reviews
8.0Comfort
7.0Food
8.6Crew
7.5Entertainment
8.1Boarding
Airline reviews

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

10.0 ExcellentAnonymous, Feb 2026
STL - DAL
Read more Southwest reviews

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.

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.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

I am very appreciative of the help provided to me by Dennis and Whitney. I had lost my phone at EWR airport and they were very kind in assisting me. This included advice on how to file a report and also helping me connect with family. The pilot was also great about keeping passengers updated on the flight progress with regular communications over the system.

The screens were inoperable for movies and such, but everything else was just fine

Crew was helpful and cheerful especially when they had no refreshments to work with. The plane was never serviced and had nothing but limited water and coffee onboard. For the price point, a concern of services.

AA did not allow to board a flight because my connecting flight from DFW had been canceled. I got on another flight to another city. No service on the plane and I did not use their entertainment system.

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.

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

Information on your arrival and departure airports