STL - HRL

$245 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 1/17. 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
$245
United Airlines
mar 2/17mer 2/25
STL - HRL • 1 stop
Cheapest one-way
$176
Southwest
sab 1/17
STL - HRL • 1 stop
Top airlines
United 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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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

mar, feb 17 - mer, feb 25
United Airlines Logo
6:00 am - 11:24 am
STL
-
HRL
5h 24m
1 stop
United Airlines Logo
5:22 pm - 10:14 pm
HRL
-
STL
4h 52m
1 stop
$245United Airlines
mar, feb 17 - mer, feb 25
American Airlines Logo
9:23 am - 6:16 pm
STL
-
HRL
8h 53m
2 stops
American Airlines Logo
6:46 pm - 11:22 pm
HRL
-
STL
4h 36m
1 stop
$259American Airlines
mer, feb 18 - sab, feb 28
American Airlines Logo
11:46 am - 6:16 pm
STL
-
HRL
6h 30m
1 stop
American Airlines Logo
6:46 pm - 11:22 pm
HRL
-
STL
4h 36m
1 stop
$266American Airlines
mer, feb 18 - sab, feb 28
American Airlines Logo
10:37 am - 6:16 pm
STL
-
HRL
7h 39m
2 stops
American Airlines Logo
6:46 pm - 11:22 pm
HRL
-
STL
4h 36m
1 stop
$271American Airlines
lun, gen 26 - gio, gen 29
American Airlines Logo
5:04 pm - 11:21 pm
STL
-
HRL
6h 17m
1 stop
American Airlines Logo
6:02 am - 11:05 am
HRL
-
STL
5h 03m
1 stop
$309American Airlines
gio, feb 26 - lun, mar 2
Southwest Logo
3:15 pm - 10:10 pm
STL
-
HRL
6h 55m
1 stop
Southwest Logo
9:45 am - 2:20 pm
HRL
-
STL
4h 35m
1 stop
$323Southwest
mer, feb 18 - sab, feb 28
American Airlines Logo
8:00 am - 6:16 pm
STL
-
HRL
10h 16m
2 stops
American Airlines Logo
6:00 am - 1:50 pm
HRL
-
STL
7h 50m
2 stops
$327American Airlines
gio, feb 26 - lun, mar 2
Southwest Logo
3:15 pm - 10:10 pm
STL
-
HRL
6h 55m
1 stop
Southwest Logo
9:45 am - 5:35 pm
HRL
-
STL
7h 50m
2 stops
$328Southwest
gio, feb 26 - lun, mar 2
Southwest Logo
5:00 am - 11:30 am
STL
-
HRL
6h 30m
2 stops
Southwest Logo
9:45 am - 5:35 pm
HRL
-
STL
7h 50m
2 stops
$334Southwest
ven, gen 23 - dom, gen 25
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
$338United 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 United Airlines ($245) and American Airlines ($259).

Which airlines fly non-stop between St. Louis and Harlingen?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from St. Louis to Harlingen.

There are 2 airlines that fly nonstop from St. Louis to Harlingen. They are American Airlines and Southwest. The cheapest airline for this route is Southwest, with the best round-trip deal found costing $196. On average, the best prices for this route can be found at Southwest.

Good to know

Low seasonMay
Cheapest flight$176
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 $176 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 $357 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 4256 reviews
8.0Comfort
8.1Boarding
8.6Crew
7.5Entertainment
7.0Food
Airline reviews

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

10.0 ExcellentIlevba, Nov 2025
DCA - DAL
Read more Southwest reviews

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.

First, my flight was a usual flight nothing exceptional or unexpected. Over all it was a normal, good flight! Second, your questionaire is wholly lacking in the proper options to which one can answer a question. Often on short flights, there is no food let alone entertainment so why isn't that reflected in your questionaire? A simple "not applicable" would cover that issue appropriately but no, your form arbitrarily enters an answer based on the initial assessment which normally isn't factual. Until you provide an accurate means of assessing flights, I'll no longer be completing of these unimpressive and misleading assessements. Thank you!

Easy to book and to get check in and get on and off.

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.

Kayak was among the missing. There was not the usual advice regarding next gate after arriving in Dallas. No communication after the reminder to check in before the Moline flight. What happened?

They should have allowed for extra time to de-ice the plane before boarding passengers. This delayed us about 10-15 mins after we boarded. Overall experience was fine. Crew was friendly and on top of everything. We didn’t have any issues during the flight.

Our flight from Eagle to Vail was delayed to the point we missed our connection to Savannah. Now we’re a family of 4 in a hotel room with luggage, no toiletries, no clean clothes. Gate attendant said the delay was mechanical but it was put in the system as something else so no compensation. That’s just wrong.

I take this flight about 6-8 times per year. It is convenient and saves an hour or two by skipping PDX, SEA, PHX, or ORD (but it takes longer to get bags to the carousel than Alaska Airlines). I wish the food service were better (but they might cut back on it because it is a red-eye). The WifI seems to go down about an hour out of Anchorage, and then comes back about an hour later...so be warned if this is an issue for you.

WiFi didn’t work the entire flight. Very disappointing. Minimal food and options - sadly the state of current affairs. All other aspects of the flight were fine.

For whatever reason, the flight was not catered -we were told it would be a 45 minute delay waiting for catering - so no food. There were opened candy and peanuts in the seatback pocket. Flight landed early in DFW but due to the assigned gate not being available, we sat on the ground for 30 minutes waiting for the gate to open - making the flight actually arrive at the gate late.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

A little late at the start but all worked out well.

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

Information on your arrival and departure airports