$129+ Cheap flights from St. Louis to Harlingen (STL - HRL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HRL
Jun 11 — Jun 181
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis to Harlingen with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Harlingen
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to HarlingenExplore the most affordable flight options available from St. Louis to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 12, 2026.
Explore the most affordable flight options available from St. Louis to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 12, 2026.
This American Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:29 am
STL
- HRL
1 stop4h 44m
American Airlines
Tue 6/234:57 pm
HRL
- STL
1 stop4h 40m
American Airlines
Deal found 5/9![American Airlines logo]()
$328
This American Airlines deal was found by Cheapflights users on 5/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:25 am
STL
- HRL
1 stop4h 48m
American Airlines
Sat 5/305:18 pm
HRL
- STL
1 stop4h 24m
American Airlines
Deal found 5/11![American Airlines logo]()
$332
This American Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/239:41 am
STL
- HRL
1 stop7h 07m
American Airlines
Wed 5/274:57 pm
HRL
- STL
1 stop4h 45m
American Airlines
Deal found 5/8![American Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/172:20 pm
STL
- HRL
2 stops6h 30m
Southwest
Tue 6/235:00 pm
HRL
- STL
1 stop4h 10m
Southwest
Deal found 5/9![Southwest logo]()
$368
This Southwest deal was found by Cheapflights users on 5/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:35 am
STL
- HRL
2 stops6h 35m
Southwest
Sat 5/307:00 am
HRL
- STL
2 stops11h 05m
Southwest
Deal found 5/11![Southwest logo]()
$430
This American Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:29 am
STL
- HRL
1 stop4h 44m
American Airlines
Wed 6/244:57 pm
HRL
- STL
1 stop4h 40m
American Airlines
Deal found 5/9![American Airlines logo]()
$431
This Southwest deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1511:15 am
STL
- HRL
1 stop5h 00m
Southwest
Mon 5/1812:30 pm
HRL
- STL
1 stop10h 10m
Southwest
Deal found 5/10![Southwest logo]()
$433
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:40 pm
STL
- HRL
2 stops5h 55m
Southwest
Wed 5/276:20 am
HRL
- STL
1 stop6h 05m
Southwest
Deal found 5/8![Southwest logo]()
$434
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:20 am
STL
- HRL
1 stop4h 57m
American Airlines
Sun 5/172:51 pm
HRL
- STL
1 stop4h 39m
American Airlines
Deal found 5/10![American Airlines logo]()
$441
Best flights from St. Louis to HarlingenDiscover carefully curated flight deals from St. Louis to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 12, 2026.
Discover carefully curated flight deals from St. Louis to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 12, 2026.
This American Airlines deal was found by Cheapflights users on 5/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:25 am
STL
- HRL
1 stop4h 48m
American Airlines
Sat 5/305:18 pm
HRL
- STL
1 stop4h 24m
American Airlines
Deal found 5/11![American Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:50 am
STL
- HRL
2 stops6h 15m
Southwest
Tue 6/2312:45 pm
HRL
- STL
2 stops6h 35m
Southwest
Deal found 5/9![Southwest logo]()
$427
This United Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2511:15 am
STL
- HRL
1 stop4h 44m
United Airlines
Wed 8/261:59 pm
HRL
- STL
2 stops22h 03m
United Airlines
Deal found 5/10![United Airlines logo]()
$464
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:40 pm
STL
- HRL
2 stops5h 55m
Southwest
Wed 5/276:20 am
HRL
- STL
1 stop6h 05m
Southwest
Deal found 5/8![Southwest logo]()
$434
This United Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/178:35 am
STL
- HRL
1 stop7h 24m
United Airlines
Sun 6/215:10 am
HRL
- STL
1 stop4h 57m
United Airlines
Deal found 5/9![United Airlines logo]()
$498
Last-minute flights from St. Louis to HarlingenDiscover last-minute flight deals from St. Louis to Harlingen. Data last updated May 12, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Harlingen. Data last updated May 12, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1511:15 am
STL
- HRL
1 stop5h 00m
Southwest
Mon 5/1812:30 pm
HRL
- STL
1 stop10h 10m
Southwest
Deal found 5/10![Southwest logo]()
$433
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:20 am
STL
- HRL
1 stop4h 57m
American Airlines
Sun 5/172:51 pm
HRL
- STL
1 stop4h 39m
American Airlines
Deal found 5/10![American Airlines logo]()
$441
This American Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/239:41 am
STL
- HRL
1 stop7h 07m
American Airlines
Wed 5/274:57 pm
HRL
- STL
1 stop4h 45m
American Airlines
Deal found 5/8![American Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:40 pm
STL
- HRL
2 stops5h 55m
Southwest
Wed 5/276:20 am
HRL
- STL
1 stop6h 05m
Southwest
Deal found 5/8![Southwest logo]()
$434
This American Airlines deal was found by Cheapflights users on 5/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:25 am
STL
- HRL
1 stop4h 48m
American Airlines
Sat 5/305:18 pm
HRL
- STL
1 stop4h 24m
American Airlines
Deal found 5/11![American Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 5/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:35 am
STL
- HRL
2 stops6h 35m
Southwest
Sat 5/307:00 am
HRL
- STL
2 stops11h 05m
Southwest
Deal found 5/11![Southwest logo]()
$430
This American Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:29 am
STL
- HRL
1 stop4h 44m
American Airlines
Tue 6/234:57 pm
HRL
- STL
1 stop4h 40m
American Airlines
Deal found 5/9![American Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/172:20 pm
STL
- HRL
2 stops6h 30m
Southwest
Tue 6/235:00 pm
HRL
- STL
1 stop4h 10m
Southwest
Deal found 5/9![Southwest logo]()
$368
This American Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:29 am
STL
- HRL
1 stop4h 44m
American Airlines
Wed 6/244:57 pm
HRL
- STL
1 stop4h 40m
American Airlines
Deal found 5/9![American Airlines logo]()
$431
One-way flights from St. Louis to HarlingenSearch for one-way flight options from St. Louis to Harlingen. Find affordable one-way fares based on user searches. Data last updated May 12, 2026.
Search for one-way flight options from St. Louis to Harlingen. Find affordable one-way fares based on user searches. Data last updated May 12, 2026.
This American Airlines deal was found by Cheapflights users on 5/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/287:20 pm
STL
- HRL
1 stop4h 54m
American Airlines
Deal found 5/11![American Airlines logo]()
$129
This American Airlines deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:29 am
STL
- HRL
1 stop4h 44m
American Airlines
Deal found 5/12![American Airlines logo]()
$137
This Southwest deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:05 am
STL
- HRL
2 stops5h 55m
Southwest
Deal found 5/12![Southwest logo]()
$219
Find flight deals from St. Louis to Harlingen
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Harlingen (HRL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $328 (American Airlines) |
One-way from | $129 (American Airlines) |
Popular in | December |
Cheapest in | October |
Average price | $400 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Harlingen that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 12, 2026.
Use the filters below to find and compare flights from St. Louis to Harlingen that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Tue 5/26
5:25 am-10:13 am
1 stop4h 48m
Harlingen Valley Intl
Sat 5/30
5:18 pm-9:42 pm
1 stop4h 24m
$332
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Wed 6/17
5:50 am-12:05 pm
2 stops6h 15m
Harlingen Valley Intl
Tue 6/23
12:45 pm-7:20 pm
2 stops6h 35m
$427
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Sat 5/23
3:40 pm-9:35 pm
2 stops5h 55m
Harlingen Valley Intl
Wed 5/27
6:20 am-12:25 pm
1 stop6h 05m
$434
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Tue 8/25
11:15 am-3:59 pm
1 stop4h 44m
Harlingen Valley Intl
Wed 8/26
1:59 pm-12:02 pm
2 stops22h 03m
$464
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Wed 6/17
8:35 am-3:59 pm
1 stop7h 24m
Harlingen Valley Intl
Sun 6/21
5:10 am-10:07 am
1 stop4h 57m
$498
Cheapest one-way
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Thu 5/28
6:00 am-4:25 pm
2 stops10h 25m
$134
Quickest one-way
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Thu 6/18
5:29 am-10:13 am
1 stop4h 44m
$137
St. LouisHarlingen
STL - HRL
STLHRL
Lambert-St Louis
Thu 6/18
5:05 am-11:00 am
2 stops5h 55m
$219
Sorted by cheapest first
Compare providers for flights from St. Louis to Harlingen
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Harlingen in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Harlingen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Harlingen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Harlingen flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Harlingen flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Harlingen flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Harlingen
Have a flexible travel schedule? Discover the best time to fly to Harlingen from St. Louis with our price prediction graph.
STL-HRL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Harlingen
What’s the top layover airport for flights from St. Louis to Harlingen?
Share of 1-stop round-trip flights from St. Louis to Harlingen chosen by Cheapflights users in the past 12 months, using the same layover each way.
Houston (IAH) – chosen by Cheapflights users on 50% of 1-stop itineraries from St. Louis to Harlingen on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to Harlingen?
Average round-trip fare for 1-stop flights from St. Louis to Harlingen, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Houston (HOU) is the most affordable 1-stop option, with an average round-trip price of $217.
What’s the fastest layover option from St. Louis to Harlingen?
Shortest average travel time for 1-stop one-way flights from St. Louis to Harlingen, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Houston (HOU) have the shortest average one-way travel time for 1-stop routes: 4h 55m.
Which airport typically offers the quickest layover for flights from St. Louis to Harlingen?
Average layover duration for 1-stop one-way flights from St. Louis to Harlingen, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Houston (IAH) offer the fastest connection on this route, with an average layover time of 1h 17m.
Reviews of airlines servicing Harlingen
Get insights into the airlines that provide service to Harlingen. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Harlingen. Reviews last updated May 12, 2026.
Get a feel of what it's like to fly with Southwest and American Airlines from St. Louis to Harlingen by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Harlingen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Harlingen flight routes
Other flight options
Other flights from St. Louis
Popular flights
Alternative routes for St. Louis to Harlingen
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Harlingen by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Harlingen by cabin class
Find flights from St. Louis to Harlingen, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Harlingen
Explore flights to Harlingen departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 12, 2026.
St. Louis and Harlingen flights
Browse other St. Louis and Harlingen flight options. Last updated on May 12, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on May 12, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from St. Louis to Harlingen
Discover the top 2 airlines that operate flights from St. Louis to Harlingen. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$212 | Average$390 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$216 | Average$347 | FlexibilityNo cancel fee | On-time63% |