$107 Cheap Flights from Harlingen (HRL) to St. Louis (STL)

View $107 flight on Wed, Jan 21, 2026Opens in a new window

Popular airlines from Valley Intl. Airport (HRL) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Harlingen to St. Louis (HRL-STL)

Prices were available within the past 7 days and start at $107 for one-way flights and $225 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Jan 15 - Mon, Jan 19
HRL
Harlingen
STL
St. Louis
$225 Roundtrip, found 1 day ago
$225
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Jan 15 from Harlingen to St. Louis, returning Mon, Jan 19, priced at $225 found 1 day ago
Southwest Airlines
Thu, Jan 15 - Mon, Jan 19
HRL
Harlingen
STL
St. Louis
$226 Roundtrip, found 1 day ago
$226
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Jan 15 from Harlingen to St. Louis, returning Mon, Jan 19, priced at $226 found 1 day ago
American Airlines
Fri, Jan 30 - Wed, Feb 4
HRL
Harlingen
STL
St. Louis
$228 Roundtrip, found 6 days ago
$228
Roundtrip
found 6 days ago
Select American Airlines flight, departing Fri, Jan 30 from Harlingen to St. Louis, returning Wed, Feb 4, priced at $228 found 6 days ago
American Airlines
Mon, Feb 2 - Mon, Feb 9
HRL
Harlingen
STL
St. Louis
$233 Roundtrip, found 8 hours ago
$233
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Mon, Feb 2 from Harlingen to St. Louis, returning Mon, Feb 9, priced at $233 found 8 hours ago
Delta
Thu, Jan 29 - Sat, Jan 31
HRL
Harlingen
STL
St. Louis
$238 Roundtrip, found 6 days ago
$238
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Jan 29 from Harlingen to St. Louis, returning Sat, Jan 31, priced at $238 found 6 days ago
American Airlines
Mon, Feb 2 - Mon, Feb 9
HRL
Harlingen
STL
St. Louis
$241 Roundtrip, found 8 hours ago
$241
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Mon, Feb 2 from Harlingen to St. Louis, returning Mon, Feb 9, priced at $241 found 8 hours ago
Southwest Airlines
Thu, Feb 5 - Mon, Feb 9
HRL
Harlingen
STL
St. Louis
$241 Roundtrip, found 3 days ago
$241
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Thu, Feb 5 from Harlingen to St. Louis, returning Mon, Feb 9, priced at $241 found 3 days ago
Southwest Airlines
Fri, Jan 30 - Wed, Feb 4
HRL
Harlingen
STL
St. Louis
$243 Roundtrip, found 6 days ago
$243
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Fri, Jan 30 from Harlingen to St. Louis, returning Wed, Feb 4, priced at $243 found 6 days ago
Delta
Thu, Feb 5 - Mon, Feb 9
HRL
Harlingen
STL
St. Louis
$244 Roundtrip, found 3 days ago
$244
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Feb 5 from Harlingen to St. Louis, returning Mon, Feb 9, priced at $244 found 3 days ago
United
Sat, Feb 21 - Mon, Feb 23
HRL
Harlingen
STL
St. Louis
$249 Roundtrip, found 1 day ago
$249
Roundtrip
found 1 day ago
Select United flight, departing Sat, Feb 21 from Harlingen to St. Louis, returning Mon, Feb 23, priced at $249 found 1 day ago

Find the cheapest month to fly from Harlingen (HRL) to St. Louis (STL)

September is typically the cheapest month to fly

From $195 - $358 per traveler.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $359
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $359

Frequently asked questions

How much does a flight from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $107 or cheap return flight from $225 from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from HRL to STL is January, when demand is low. Off-peak season is usually when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest HRL to STL flight.
How many flights per day from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL)?
You'll need to catch a flight with a layover when traveling from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from HRL to STL?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Flights after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from HRL to STL just before your journey is typically more expensive. But if there's some wiggle room with your departure dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a HRL to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a HRL to STL flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one convenient place takes the hassle out of planning your trip. Just secure your flights and select from our extensive range of stays, then personalize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Valley Intl. Airport (HRL) to Lambert-St. Louis Intl. Airport (STL)?
Generally, it's possible to cancel or reschedule your HRL to STL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Valley Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$224
Distance
962 mi

Book with confidence

Harlingen to St. Louis Flights

The cheapest times to fly from Harlingen to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Harlingen to St. Louis are during the month of January. You can find some of the cheapest flights from Harlingen to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Harlingen to St. Louis

Sunday is one of the best days to book for cheap flights from Harlingen to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Harlingen to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Harlingen to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $107 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Harlingen to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Harlingen to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Harlingen to St. Louis Flights

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*Available to One Key members.