Flight tickets from St Louis to Harlingen

Compare St Louis to Harlingen flight deals

Find the cheapest month or even day of the year to fly to Harlingen

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Flight deals from St Louis Airport to Harlingen Airport

Looking for a cheap last-minute deal or the best return flight from St Louis to Harlingen? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from St Louis to Harlingen

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Harlingen flights are currently cheapest in May.

St Louis to Harlingen: Alternative routes

Compare routes from St Louis to Harlingen below. You may find an airport to fly into that's cheaper, faster, or easier than Harlingen.

St Louis to Harlingen: Flight information

The things to know before you go.
Cheapest flight found₹ 14,746
Cheapest month to flyMay

Finding cheap flights from St Louis to Harlingen: Frequently asked questions

The best price we found for a return flight from St Louis to Harlingen is ₹ 24,445. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from St Louis to Harlingen. But we found flights with one or more stops from ₹ 24,445.
As of April 2026, there are no flights flying from St Louis to Harlingen.
The cheapest month to fly from St Louis to Harlingen is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Harlingen Airport on Saturday, 18 April 2026.
No airlines currently offer direct flights between St Louis Airport and Harlingen Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Harlingen but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Harlingen is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to Harlingen.

Flying from Lambert-St. Louis International Airport (STL) to Valley International Airport (HRL): what you need to know

  • Harlingen's timezone is UTC-5, which is the same as St Louis.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are tried-and-true travel tips. Make sure you're at the airport on time to catch your STL to HRL flight.

  • You'll likely experience bigger queues in popular months like July. Arriving up to four hours in advance for international flights and two hours for a domestic departure will help ensure a smooth travel experience.

  • Consider adding a stopover when booking your ticket from Lambert-St. Louis International Airport to Valley International Airport. Simply deselect 'Direct flights only' to break up your trip, or enjoy a detour to a new and interesting place. Here's where you can stop between STL and HRL:

    • Austin-Bergstrom International Airport

    • Dallas Love Field Airport

    • Dallas/Fort Worth International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Valley International Airport (HRL)

  • Currently, ₹ 14,746 is the lowest price we've found for a one-way Lambert-St. Louis International Airport to Valley International Airport flight. The best price for a return ticket is ₹ 24,445. Keep in mind that fares can change due to availability when booking.

  • It's often best to book in advance if you want to find cheap tickets from STL to HRL. That's because flight prices are based on demand, which tends to increase closer to the date of departure.

  • If you're flexible with your travel dates, try using the 'Whole month' search function. It'll find the cheapest price in each month when looking for a flight from Lambert-St. Louis International Airport to Valley International Airport.

  • Finding cheap flights from STL to HRL couldn't be easier with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you as soon as fares go down.

  • Select your ideal departure and arrival times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to see the best deals on flights from Lambert-St. Louis International Airport to Valley International Airport.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at Valley International Airport (HRL)

Getting from Valley International Airport (HRL) to central Harlingen

  • You'll find HRL at 3002 Heritage Way.

  • Valley International Airport to central Harlingen has a drive time of around 10 minutes. It's approximately 8 kilometres away.

When to fly to Valley International Airport (HRL)

  • It's time to pick your trip dates for your flight from Lambert-St. Louis International Airport to Valley International Airport. October is the most popular month to head to Harlingen. If you prefer a more relaxed vibe, go in April.

  • The warmest month in Harlingen is August, with temperatures ranging between 25ºC and 37ºC. Book your flights from Lambert-St. Louis International Airport to Valley International Airport in this month if this is the kind of weather you like.

  • For cooler conditions, search for a cheap ticket from STL to HRL in January. Average temperatures are between 10ºC and 25ºC then.

Explore more of United States

  • Harlingen has plenty going for it, but there are so many other parts of United States you'll want to see. Around 451 kilometres north-east of Harlingen, a visit to Houston will keep you busy. Don't miss top attractions like The Houston Museum of Natural Science, The Museum of Fine Arts, Houston, Beck Building and Hermann Park.

  • If there's time to check out another side of United States, head for San Antonio, roughly 370 kilometres north of Harlingen. The San Antonio River Walk, San Antonio Missions National Historical Park and San Fernando Cathedral are among the biggest draws.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.