Title: CA $633 Cheap United fights from St. Louis to Harlingen - Expedia.ca

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# CA $633 Cheap United fights from St. Louis (STL) to Harlingen (HRL)

[View CA $633 flight on Mon, Mar 23, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:STL,to:HRL,departure:23/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:632.20&airProductToken=AQpmCjEI1YIBEgQ2MjE5GPJcIIg4KJu2iAMwqreIAzhVQABYAWoFMl9lY29yCFVBQTdBRkVOCjEI1YIBEgQ0OTE5GIg4IKdcKPq3iAMw0LiIAzhVQABYAWoFMl9lY29yCFVBQTdBRkVOEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) 

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## United flights from St. Louis to Harlingen (STL→HRL)

Prices were available within the past 7 days and start at CA $633 for one-way flights and CA $998 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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One way

Roundtrip

![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif)

Mon, Mar 23 - Sat, Mar 28

STL

St. Louis

HRL

Harlingen

CA $998

Roundtrip

found 6 days ago

[](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:HRL,departure:23/03/2026TANYT&leg2=from:HRL,to:STL,departure:28/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:997.80&airProductToken=AQpmCjEI1YIBEgQxMzcxGPJcIIg4KJSxiAMwoLKIAzhVQABYAWoFMl9lY29yCFVBQTdBRkVOCjEI1YIBEgQ0MzM4GIg4IKdcKPWyiAMw0LOIAzhVQABYAWoFMl9lY29yCFVBQTdBRkVOCmYKMQjVggESBDQ4NzAYp1wgiDgo4e6IAzC074gDOFNAAFgBagUyX2Vjb3IIU0FLMFBGRE4KMQjVggESBDE2NjMYiDgg8lwoiPCIAzCE8YgDOFNAAFgBagUyX2Vjb3IIU0FLMFBGRE4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL)

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

### October is typically the cheapest month to fly

From CA $244 - CA $512 per traveller.

__Flight from St. Louis to Harlingen (STL - HRL) route information__
| Origin airport      | Lambert-St. Louis Intl. |
| ------------------- | ----------------------- |
| Destination airport | Valley Intl.            |
| Distance            | 1540 km                 |

## Frequently asked questions

### How much is a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?

### What is the cheapest month to fly from STL to HRL with United Airlines?

### Does United Airlines fly nonstop from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?

### What airports does United Airlines fly into in Harlingen?

### Can I change or cancel my United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Valley Intl. Airport (HRL)?

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