$100 Cheap Flights from Harlingen (HRL) to Denver (DEN)

View $100 flight on Sun, May 25, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Harlingen to Denver (HRL-DEN)

Prices were available within the past 7 days and start at $100 for one-way flights and $199 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Sun, May 25 - Wed, May 28
HRL
Harlingen
DEN
Denver
$199 Roundtrip, found 3 hours ago
$199
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sun, May 25 from Harlingen to Denver, returning Wed, May 28, priced at $199 found 3 hours ago
Southwest Airlines
Sun, May 25 - Wed, May 28
HRL
Harlingen
DEN
Denver
$204 Roundtrip, found 3 hours ago
$204
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sun, May 25 from Harlingen to Denver, returning Wed, May 28, priced at $204 found 3 hours ago
Southwest Airlines
Sat, May 24 - Tue, May 27
HRL
Harlingen
DEN
Denver
$219 Roundtrip, found 3 hours ago
$219
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sat, May 24 from Harlingen to Denver, returning Tue, May 27, priced at $219 found 3 hours ago
American Airlines
Fri, May 30 - Mon, Jun 2
HRL
Harlingen
DEN
Denver
$219 Roundtrip, found 3 hours ago
$219
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Fri, May 30 from Harlingen to Denver, returning Mon, Jun 2, priced at $219 found 3 hours ago
American Airlines
Fri, May 30 - Mon, Jun 2
HRL
Harlingen
DEN
Denver
$222 Roundtrip, found 3 hours ago
$222
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Fri, May 30 from Harlingen to Denver, returning Mon, Jun 2, priced at $222 found 3 hours ago
Southwest Airlines
Sat, May 24 - Tue, May 27
HRL
Harlingen
DEN
Denver
$224 Roundtrip, found 3 hours ago
$224
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sat, May 24 from Harlingen to Denver, returning Tue, May 27, priced at $224 found 3 hours ago
Southwest Airlines
Mon, Jun 9 - Wed, Jun 11
HRL
Harlingen
DEN
Denver
$227 Roundtrip, found 2 days ago
$227
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Mon, Jun 9 from Harlingen to Denver, returning Wed, Jun 11, priced at $227 found 2 days ago
American Airlines
Fri, May 30 - Sun, Jun 1
HRL
Harlingen
DEN
Denver
$229 Roundtrip, found 2 hours ago
$229
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Fri, May 30 from Harlingen to Denver, returning Sun, Jun 1, priced at $229 found 2 hours ago
United
Tue, Sep 9 - Mon, Sep 15
HRL
Harlingen
DEN
Denver
$239 Roundtrip, found 5 hours ago
$239
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Sep 9 from Harlingen to Denver, returning Mon, Sep 15, priced at $239 found 5 hours ago
Delta
Thu, Nov 20 - Sun, Nov 23
HRL
Harlingen
DEN
Denver
$259 Roundtrip, found 4 hours ago
$259
Roundtrip
found 4 hours ago
Select Delta flight, departing Thu, Nov 20 from Harlingen to Denver, returning Sun, Nov 23, priced at $259 found 4 hours ago
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
$198
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 May. 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 2025. You can also book with separate airlines for your outbound and return journeys, from $100 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?
Discover the latest flight deals from HRL to DEN by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from HRL to DEN?
The cheapest flights from HRL to DEN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from HRL to DEN?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from HRL to DEN. Sort your results by “Price (lowest to highest)” to snap up a great deal.
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.

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*Available to One Key members.