$90 Cheap Flights from Harlingen (HRL) to Denver (DEN)

View $90 flight on Mon, Jan 26, 2026Opens in a new window

Popular airlines from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN)

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Harlingen to Denver (HRL-DEN)

Prices were available within the past 7 days and start at $90 for one-way flights and $171 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Sat, Jan 24 - Tue, Jan 27
HRL
Harlingen
DEN
Denver
$171 Roundtrip, found 5 days ago
$171
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Jan 24 from Harlingen to Denver, returning Tue, Jan 27, priced at $171 found 5 days ago
Southwest Airlines
Sat, Jan 10 - Wed, Jan 14
HRL
Harlingen
DEN
Denver
$176 Roundtrip, found 5 days ago
$176
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Jan 10 from Harlingen to Denver, returning Wed, Jan 14, priced at $176 found 5 days ago
American Airlines
Wed, Jan 21 - Sun, Jan 25
HRL
Harlingen
DEN
Denver
$179 Roundtrip, found 3 hours ago
$179
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Jan 21 from Harlingen to Denver, returning Sun, Jan 25, priced at $179 found 3 hours ago
Southwest Airlines
Sat, Jan 10 - Wed, Jan 14
HRL
Harlingen
DEN
Denver
$181 Roundtrip, found 5 days ago
$181
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Jan 10 from Harlingen to Denver, returning Wed, Jan 14, priced at $181 found 5 days ago
American Airlines
Sat, Jan 24 - Tue, Jan 27
HRL
Harlingen
DEN
Denver
$184 Roundtrip, found 5 days ago
$184
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Jan 24 from Harlingen to Denver, returning Tue, Jan 27, priced at $184 found 5 days ago
Southwest Airlines
Thu, Jan 22 - Sun, Jan 25
HRL
Harlingen
DEN
Denver
$184 Roundtrip, just found
$184
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Jan 22 from Harlingen to Denver, returning Sun, Jan 25, priced at $184 just found
Southwest Airlines
Mon, Jan 5 - Fri, Jan 9
HRL
Harlingen
DEN
Denver
$188 Roundtrip, found 1 day ago
$188
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Mon, Jan 5 from Harlingen to Denver, returning Fri, Jan 9, priced at $188 found 1 day ago
United
Wed, Jan 21 - Sun, Jan 25
HRL
Harlingen
DEN
Denver
$201 Roundtrip, found 3 hours ago
$201
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Jan 21 from Harlingen to Denver, returning Sun, Jan 25, priced at $201 found 3 hours ago
Delta
Fri, Dec 19 - Fri, Jan 9
HRL
Harlingen
DEN
Denver
$222 Roundtrip, found 1 day ago
$222
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Dec 19 from Harlingen to Denver, returning Fri, Jan 9, priced at $222 found 1 day ago
Sun Country Airlines
Thu, Feb 26 - Sun, Mar 1
HRL
Harlingen
DEN
Denver
$483 Roundtrip, found 6 days ago
$483
Roundtrip
found 6 days ago
Select Sun Country Airlines flight, departing Thu, Feb 26 from Harlingen to Denver, returning Sun, Mar 1, priced at $483 found 6 days ago

Find the cheapest month to fly from Harlingen (HRL) to Denver (DEN)

October is typically the cheapest month to fly

From $170 - $308 per traveler.

Alternative airports near Denver

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

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $339
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $339
Flights from Harlingen (HRL) to Denver (DEN)
Origin airport
Valley Intl.
Destination airport
Denver Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$170
Distance
1024 mi

Harlingen to Denver Flights

The cheapest times to fly from Harlingen to Denver

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 Denver are during the month of January. You can find some of the cheapest flights from Harlingen to Denver with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Harlingen to Denver

Sunday is one of the best days to book for cheap flights from Harlingen to Denver: 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 Denver

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 Denver in 2026. You can also book with separate airlines for your outbound and return journeys, from $90 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 Denver 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 Denver 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.

 

Frequently asked questions

How much does a flight from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN) cost?
Lock in a cheap one-way flight from $90 or cheap return flight from $171 from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN) 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 Denver Intl. Airport (DEN)?
Traveling in January can help you save, as it's the cheapest month for flights between HRL and DEN. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN)?
To find the cheapest airline flying from HRL to DEN, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN)?
Direct flights from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from HRL to DEN?
Usually you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the time of year, carrier and other factors.*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 Denver Intl. Airport (DEN)?
To reach Denver Intl. Airport (DEN) without delays, choose a flight that takes off from Valley Intl. Airport (HRL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Denver Intl. Airport (DEN) last-minute?
Booking your flight from HRL to DEN shortly before your journey is generally more expensive. However, if you're flexible with your travel times and dates, you could land a cheap last-minute fare.
Is it cheaper to book a HRL to DEN flight and hotel package?
Compared with arranging flights and hotels separately, booking a HRL to DEN flight and hotel package with Expedia could result in significant savings. What's more, managing everything in one place will take the hassle out of planning your trip. Just secure your flights and select from our wide range of hotels, then tailor your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN)?
You can usually cancel or reschedule your HRL to DEN 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 whether any costs are involved. You'll also find further details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.