$143+ Cheap flights from Harlingen to St. Louis (HRL - STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — STL
Oct 25 — Nov 11
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Harlingen to St. Louis 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 Harlingen to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Harlingen to St. LouisExplore the most affordable flight options available from Harlingen to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 25, 2026.
Explore the most affordable flight options available from Harlingen to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 25, 2026.
This United Airlines deal was found by Cheapflights users on 9/22. 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 12/164:39 pm -
1 stop5h 51m
Fri 1/18:32 am -
1 stop7h 31m
Deal found 9/22![United Airlines logo]()
$307
This American Airlines deal was found by Cheapflights users on 9/21. 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 10/156:42 pm -
1 stop5h 00m
Sun 10/255:40 am -
1 stop4h 28m
Deal found 9/21![American Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/22. 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 12/167:25 am -
2 stops8h 10m
Fri 1/18:25 am -
2 stops7h 25m
Deal found 9/22![Southwest logo]()
$409
This Southwest deal was found by Cheapflights users on 9/21. 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 10/156:30 pm -
1 stop4h 00m
Sun 10/255:00 am -
2 stops8h 00m
Deal found 9/21![Southwest logo]()
$423
This Southwest deal was found by Cheapflights users on 9/22. 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 9/246:20 am -
1 stop5h 00m
Tue 9/296:00 am -
1 stop7h 00m
Deal found 9/22![Southwest logo]()
$481
This Southwest deal was found by Cheapflights users on 9/23. 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 9/255:30 am -
1 stop3h 50m
Sun 9/276:05 am -
1 stop8h 30m
Deal found 9/23![Southwest logo]()
$514
This Southwest deal was found by Cheapflights users on 9/21. 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 11/253:40 pm -
1 stop6h 55m
Sun 11/297:55 pm -
1 stop4h 25m
Deal found 9/21![Southwest logo]()
$572
Best flights from Harlingen to St. LouisDiscover carefully curated flight deals from Harlingen to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 25, 2026.
Discover carefully curated flight deals from Harlingen to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 25, 2026.
This United Airlines deal was found by Cheapflights users on 9/22. 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 12/164:39 pm -
1 stop5h 51m
Fri 1/18:32 am -
1 stop7h 31m
Deal found 9/22![United Airlines logo]()
$307
This American Airlines deal was found by Cheapflights users on 9/21. 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 10/156:42 pm -
1 stop5h 00m
Sun 10/255:40 am -
1 stop4h 28m
Deal found 9/21![American Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/22. 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 2/107:40 am -
2 stops7h 25m
Mon 2/222:10 pm -
2 stops8h 00m
Deal found 9/22![Southwest logo]()
$399
This United Airlines deal was found by Cheapflights users on 9/22. 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 2/105:05 am -
2 stops9h 23m
Mon 2/226:15 am -
1 stop4h 44m
Deal found 9/22![United Airlines logo]()
$363
This Southwest deal was found by Cheapflights users on 9/21. 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 10/156:30 pm -
1 stop4h 00m
Sun 10/255:00 am -
2 stops8h 00m
Deal found 9/21![Southwest logo]()
$423
This Southwest deal was found by Cheapflights users on 9/21. 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 11/253:40 pm -
2 stops8h 35m
Sun 11/297:55 pm -
1 stop4h 25m
Deal found 9/21![Southwest logo]()
$577
Last-minute flights from Harlingen to St. LouisDiscover last-minute flight deals from Harlingen to St. Louis. Data last updated September 25, 2026 and is based on user searches.
Discover last-minute flight deals from Harlingen to St. Louis. Data last updated September 25, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 9/22. 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 9/246:20 am -
1 stop5h 00m
Tue 9/296:00 am -
1 stop7h 00m
Deal found 9/22![Southwest logo]()
$481
This Southwest deal was found by Cheapflights users on 9/23. 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 9/255:30 am -
1 stop3h 50m
Sun 9/276:05 am -
1 stop8h 30m
Deal found 9/23![Southwest logo]()
$514
This American Airlines deal was found by Cheapflights users on 9/21. 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 10/156:42 pm -
1 stop5h 00m
Sun 10/255:40 am -
1 stop4h 28m
Deal found 9/21![American Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/21. 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 10/156:30 pm -
1 stop4h 00m
Sun 10/255:00 am -
2 stops8h 00m
Deal found 9/21![Southwest logo]()
$423
One-way flights from Harlingen to St. LouisSearch for one-way flight options from Harlingen to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 25, 2026.
Search for one-way flight options from Harlingen to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 25, 2026.
This American Airlines deal was found by Cheapflights users on 9/22. 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 10/282:46 pm -
1 stop4h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![American Airlines logo]()
$143
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Fri 10/165:18 pm -
1 stop5h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$165
This American Airlines deal was found by Cheapflights users on 9/23. 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 10/236:42 pm -
1 stop5h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![American Airlines logo]()
$171
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/281:59 pm -
1 stop4h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$193
This Southwest deal was found by Cheapflights users on 9/23. 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 10/166:20 am -
2 stops6h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Southwest logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:13 pm -
3 stops25h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Multiple Airlines logo]()
$572
Find flight deals from Harlingen to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Harlingen (HRL) to St. Louis (STL). 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 September 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $307 (American Airlines) |
One-way from | $143 (American Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Harlingen to St. Louis 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 7,457,451 searches. Data last updated September 25, 2026.
Use the filters below to find and compare flights from Harlingen to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Wed 10/28
2:46 pm-7:18 pm
1 stop4h 32m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$143
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Fri 10/16
5:18 pm-10:30 pm
1 stop5h 12m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$165
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Fri 10/23
6:42 pm-11:42 pm
1 stop5h 00m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$171
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Wed 10/28
1:59 pm-6:38 pm
1 stop4h 39m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$193
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Wed 11/25
5:25 pm-10:26 pm
1 stop5h 01m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$193
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Wed 12/16
4:39 pm-10:30 pm
1 stop5h 51m
Lambert-St Louis
Fri 1/1
8:32 am-4:03 pm
1 stop7h 31m
$307
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Thu 10/15
6:42 pm-11:42 pm
1 stop5h 00m
Lambert-St Louis
Sun 10/25
5:40 am-10:08 am
1 stop4h 28m
$327
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Wed 2/10
5:05 am-2:28 pm
2 stops9h 23m
Lambert-St Louis
Mon 2/22
6:15 am-10:59 am
1 stop4h 44m
$363
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Wed 2/10
7:40 am-3:05 pm
2 stops7h 25m
Lambert-St Louis
Mon 2/22
2:10 pm-10:10 pm
2 stops8h 00m
$399
HarlingenSt. Louis
HRL Harlingen Valley Intl - STL Lambert-St Louis
HRLSTL
Harlingen Valley Intl
Thu 10/15
6:30 pm-10:30 pm
1 stop4h 00m
Lambert-St Louis
Sun 10/25
5:00 am-1:00 pm
2 stops8h 00m
$423
Showing 1-10 of 11 resultsSorted by cheapest first
Compare providers for flights from Harlingen to St. Louis
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 Harlingen to St. Louis in September.
| 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 Harlingen-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Harlingen-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Harlingen-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Harlingen-St. Louis 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 Harlingen-St. Louis 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 Harlingen to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Harlingen with our price prediction graph.
HRL-STL
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.
Related info for your journey
Find useful and relevant information for your journey from Harlingen to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Wentzville
Maryland Heights
Collinsville
Edwardsville
Glencoe
Chesterfield
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
Other flight options
Other flights from Harlingen
Popular flights
St. Louis flight routes