HRL - DEN

$99 Find Cheap Flights from Harlingen to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Harlingen to Denver departing on 2/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harlingen to Denver, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harlingen to Denver, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$197
Overall average: $338
Southwest
Sat 2/14Wed 2/18
HRL - DEN • 1 stop
Cheapest one-way
$99
Southwest
Tue 2/10
HRL - DEN • 1 stop
Top airlines
Southwest
Cheapest • from $197 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
September
Cheapest • 40% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Nonstop flights
1 day a week
There are direct flights from Harlingen to Denver 1 day a week: Sat.
Direct flights
Direct flights
Direct flights
Direct flights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Denver!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Harlingen to Denver (HRL-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Harlingen to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Harlingen to Denver

Sat, Feb 14 - Wed, Feb 18
Southwest Logo
5:25 pm - 11:10 pm
HRL
-
DEN
6h 45m
1 stop
Southwest Logo
12:45 pm - 8:50 pm
DEN
-
HRL
7h 05m
1 stop
$197Southwest
Sat, Feb 28 - Sat, Mar 7
Southwest Logo
12:30 pm - 6:25 pm
HRL
-
DEN
6h 55m
1 stop
Southwest Logo
10:25 am - 5:40 pm
DEN
-
HRL
6h 15m
1 stop
$227Southwest
Sat, Feb 28 - Sat, Mar 7
Southwest Logo
12:30 pm - 6:25 pm
HRL
-
DEN
6h 55m
1 stop
Southwest Logo
3:30 pm - 11:55 pm
DEN
-
HRL
7h 25m
2 stops
$232Southwest
Tue, Feb 10 - Sat, Feb 14
Southwest Logo
6:30 am - 10:40 am
HRL
-
DEN
5h 10m
1 stop
Southwest Logo
2:20 pm - 9:30 pm
DEN
-
HRL
6h 10m
1 stop
$253Southwest
Sat, Apr 4 - Thu, Apr 9
Southwest Logo
6:15 pm - 12:20 am
HRL
-
DEN
7h 05m
1 stop
Southwest Logo
8:00 am - 4:15 pm
DEN
-
HRL
7h 15m
1 stop
$257Southwest
Tue, Feb 10 - Sat, Feb 14
Southwest Logo
12:15 pm - 7:35 pm
HRL
-
DEN
8h 20m
2 stops
Southwest Logo
5:50 am - 11:40 am
DEN
-
HRL
4h 50m
1 stop
$258Southwest
Thu, May 28 - Sun, May 31
Southwest Logo
6:55 am - 12:35 pm
HRL
-
DEN
6h 40m
1 stop
Southwest Logo
7:40 am - 12:40 pm
DEN
-
HRL
4h 00m
1 stop
$259Southwest
Sat, Apr 18 - Wed, Apr 22
American Airlines Logo
8:03 pm - 11:39 pm
HRL
-
DEN
4h 36m
1 stop
American Airlines Logo
7:26 am - 2:17 pm
DEN
-
HRL
5h 51m
1 stop
$268American Airlines
Wed, Feb 18 - Sun, Feb 22
Southwest Logo
6:30 am - 1:10 pm
HRL
-
DEN
7h 40m
2 stops
Southwest Logo
6:00 am - 11:30 am
DEN
-
HRL
4h 30m
1 stop
$278Southwest
Sat, May 16 - Tue, May 19
United Airlines Logo
5:18 pm - 11:58 pm
HRL
-
DEN
7h 40m
1 stop
United Airlines Logo
3:35 pm - 9:59 pm
DEN
-
HRL
5h 24m
1 stop
$281United Airlines
Booking Insights

KAYAK's insights & trends for Harlingen to Denver flights

Get data-powered insights and trends into flights from Harlingen to Denver to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Harlingen to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Harlingen to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Harlingen to Denver is September, where tickets cost $206 (return) on average. On the other hand, the most expensive months are June and March, where the average cost of round-trip tickets is $481 and $475 respectively.

Good to know

Low seasonAugust
Cheapest flight$99
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 25% lower on average.
Flight from Harlingen to Denver

When to book flights from Harlingen to Denver

Are your dates flexible? Find out the best times to travel from Harlingen to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Harlingen to Denver

  • What is the cheapest flight from Harlingen to Denver?

    In the last 3 days, the lowest price for a flight from Harlingen to Denver was $99 for a one-way ticket and $197 for a round-trip.

  • Do I need a passport to fly between Harlingen and Denver?

    No

  • Which airports will I be using when flying from Harlingen to Denver?

    When flying out of Harlingen you will be using Harlingen Valley Intl. You will be landing at Denver, also known as Denver Intl.

  • Which aircraft models fly most regularly from Harlingen to Denver?

    The Embraer 175 (Enhanced Winglets) is the aircraft model that flies most regularly on the Harlingen to Denver flight route.

  • Which airline alliances offer flights from Harlingen to Denver?

    oneworld is the only airline alliance operating flights between Harlingen and Denver.

  • Which is the best airline for flights from Harlingen to Denver, Southwest or American Airlines?

    The two airlines most popular with KAYAK users for flights from Harlingen to Denver are Southwest and American Airlines. With an average price for the route of $327 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $352 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Harlingen to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Harlingen to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Harlingen to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Harlingen is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Harlingen to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Harlingen with another airline. Booking your flights between Harlingen and DEN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Harlingen to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Harlingen up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from Harlingen to Denver?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Harlingen Valley Intl to Denver Intl.
Find which airlines fly direct from Harlingen Valley Intl Airport to Denver Intl Airport, which days they fly and book direct flights.

Direct departures

Harlingen Valley Intl to Denver Intl

Saturday

United Airlines

United Airlines

See more direct flights

Direct returns

Denver Intl to Harlingen Valley Intl

Saturday

United Airlines

United Airlines

See more direct flights

Reviews of the top airlines flying from Harlingen to Denver

 
See real verified KAYAK customer reviews for airlines flying from Harlingen to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Harlingen to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4268 reviews
7.5Entertainment
8.0Comfort
7.0Food
8.1Boarding
8.6Crew
Airline reviews

Great vacation. Can't wait till next year for another one.

10.0 ExcellentJohn, Jan 2026
SAT - PHX
Read more Southwest reviews

Great vacation. Can't wait till next year for another one.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

Check-in, Boarding and flight were smooth. All the employees and crew was very nice and funny. They gave the kids crayons and workbooks to keep them occupied which was a big win. I’ve flown Southwest many times and that’s the first time I’ve seen that and it is a great addition.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

Had to get off plane from prior flight even though I had to reboard same plane to continue to my final destination.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

Flight was canceled. I asked to be rerouted to OKC and then took an Uber.

AA did not allow to board a flight because my connecting flight from DFW had been canceled. I got on another flight to another city. No service on the plane and I did not use their entertainment system.

Don't change gate multiple times make people run across the airport. Announce delays in a timely manner. Have maintenance crew ready. Don't delay and keep passengers on the plane for 3 hrs. on tarmac.

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

Concern Regarding Significant Gate Delay and Jet Bridge Issue Dear Customer Relations Team, I am writing to express my disappointment with the experience I had on my recent flight AA 2414 on Sunday January 18, 2026. What should have been a routine departure turned into a frustrating and avoidable delay due to an issue with the jet bridge at the gate. As a result, the flight was delayed by approximately 90 minutes while multiple gate changes were attempted. The lack of clear communication during this period made the situation even more challenging. Passengers were left uncertain about the cause of the delay, the expected timeline, and the next steps. This not only disrupted travel plans but also created unnecessary stress for everyone on board. I understand that operational issues can arise, but a malfunctioning jet bridge and the resulting extended delay suggest an area where procedures or equipment maintenance may need attention. I hope you will review this incident to prevent similar disruptions in the future. I would appreciate acknowledgment of this concern and consideration of appropriate compensation for the inconvenience and lost time caused by this delay. Thank you for taking the time to review my experience. I look forward to hearing from you. Sincerely, Dion Dillard

They made me pay $40 to check a bag that was listed as free when I bought my ticket. Then before boarding they offered to check any bags free.

My seat tv didn’t work the whole trip. And the seat space is too small despite being seated at the front.

The seat cushions were very worn so they were extremely uncomfortable.

Delayed, no updates, had a rewards number but was not working

Everything you need to know for your flight from Harlingen to Denver

Information on your arrival and departure airports