HRL - DEN

$129 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 12/18. 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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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

Wed, Jan 7 - Tue, Jan 13
Southwest Logo
6:40 pm - 10:40 pmHRL-DEN
5h 00m1 stop
Southwest Logo
10:55 am - 6:00 pmDEN-HRL
6h 05m1 stop
$197Southwest
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Mon, Jan 12 - Fri, Jan 16
Southwest Logo
7:35 am - 11:50 amHRL-DEN
5h 15m1 stop
Southwest Logo
4:35 pm - 10:15 pmDEN-HRL
4h 40m1 stop
$228Southwest
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Mon, Jan 12 - Fri, Jan 16
Southwest Logo
12:15 pm - 7:35 pmHRL-DEN
8h 20m2 stops
Southwest Logo
4:35 pm - 10:15 pmDEN-HRL
4h 40m1 stop
$233Southwest
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Sat, Apr 18 - Wed, Apr 22
American Airlines Logo
10:05 am - 3:46 pmHRL-DEN
6h 41m1 stop
American Airlines Logo
5:00 am - 11:32 amDEN-HRL
5h 32m1 stop
$259American Airlines
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Sat, Apr 18 - Wed, Apr 22
American Airlines Logo
12:11 pm - 3:46 pmHRL-DEN
4h 35m1 stop
American Airlines Logo
8:33 am - 4:09 pmDEN-HRL
6h 36m1 stop
$307American Airlines
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Wed, Nov 26 - Fri, Nov 28
United Airlines Logo
5:00 pm - 11:36 pmHRL-DEN
7h 36m1 stop
United Airlines Logo
7:45 am - 3:59 pmDEN-HRL
7h 14m1 stop
$313United Airlines
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Wed, Nov 26 - Fri, Nov 28
Multiple Airlines Logo
12:22 pm - 11:44 pmHRL-DEN
36h 22m2 stops
Multiple Airlines Logo
8:30 pm - 10:31 amDEN-HRL
13h 01m1 stop
$343Multiple Airlines
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Wed, Nov 12 - Sun, Nov 16
United Airlines Logo
12:10 pm - 4:09 pmHRL-DEN
4h 59m1 stop
United Airlines Logo
5:00 am - 10:59 amDEN-HRL
4h 59m1 stop
$369United Airlines
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Tue, Mar 17 - Sun, Mar 22
Multiple Airlines Logo
12:25 pm - 8:25 pmHRL-DEN
9h 00m1 stop
Multiple Airlines Logo
7:25 pm - 10:33 amDEN-HRL
14h 08m1 stop
$427Multiple Airlines
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Tue, Apr 7 - Wed, Apr 8
Delta Logo
3:00 pm - 10:36 pmHRL-DEN
8h 36m1 stop
Delta Logo
3:45 pm - 2:29 pmDEN-HRL
21h 44m2 stops
$477Delta
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Everything you should know

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
Cheapest round-trip
$197
Typical prices: $257-$349
Southwest
Wed 1/7Tue 1/13
HRL - DEN • 1 stop
Cheapest one-way
$129
Typical prices: $201-$309
Multiple Airlines
Thu 12/18
HRL - DEN • 1 stop
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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.

How much is a round-trip flight from Harlingen, Texas to Denver?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Harlingen, Texas to Denver departing in January.

What’s the cheapest day of the week to fly from Harlingen to Denver?

The average price of all round-trip flights from Harlingen to Denver clicked on KAYAK for each day over the last 12 months.

When flying from Harlingen to Denver, you should consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to Harlingen, you’ll find the best rates on Tuesdays and the most expensive ones on Mondays.

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$129
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 24% 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 $129 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?

    Star Alliance, and oneworld are the airline alliances operating flights between Harlingen and Denver, with Star Alliance being the most commonly used for this route.

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

    The two airlines most popular with KAYAK users for flights from Harlingen to Denver are Southwest and United Airlines. With an average price for the route of $313 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $436 and an overall rating of 7.4.

  • 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.

Reviews of the top 3 airlines serving 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 4241 reviews
8.6Crew
8.1Boarding
8.0Comfort
7.5Entertainment
7.0Food
Airline reviews

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

10.0 ExcellentStacy, Oct 2025SMF - DEN
Read more Southwest reviews

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.

The Southwest employees (all two of them) were very nice and cheerful despite the fact the line to self-check a bag (simply drop it off) was hundreds of people long. Thank God I arrived early to the airport because I stood in this line for at least an hour. Once on the flight that had been delayed by an hour, we had no Wi-Fi and thus no entertainment. Finally, I hope the investor strong arm tactics against Southwest pay off in a short-term windfall to your C-Suite because the rest of you are screwed. I have been a faithful Southwest customer for 15 years due to everything you just got rid of. I'm flying to Idaho and Washington in October, both places I used to simply book with Southwest without a second thought now with Frontier (Washington) and United (Idaho) because they offer everything the "new" Southwest does but cheaper and at better times, destinations, etc. This really makes me sad...

Flights delayed by 4-6 hours. Boarding was a mess and unclear. Bags were not at arrival airport and had never even been put on the plane. No idea when I’ll get them. Don’t fly into Denver!

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

We sat on the plane on the tarmac for 4 hours.

Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.

The entertainment available didn’t work for anyone on the flight. Long 6 hr flight with no entertainment option and the staff didn’t know until an hour into the flight when we made sure they knew about it. They had no way to fix it.

Late FA meant slow boarding. WiFi did not work. I’m a medium plus sized passenger. The seatbelt was for the first time ever barely fitting. And we delayed on the tarmac 40 min

My husband and I had boarded the flight from Denver to Chicago, and one of the last passengers to get on the plane opened the overhead bin above my husband's seat and threw his bag out of the bin to make space for his own. He said, "Mine is bigger!" The flight attendant supported the new passenger. They didn't care that my husband has two artificial knees and must have the foot room in front of his seat to be able to fit his legs in -- and to be able to stand, much less walk, at the end of the flight. I have never seen this happen before, and it was a disaster.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

The only thing to like was that we eventually got to our destination

Poor seat in rear of aircraft Food at Admiral’s Club Terminal D at DFW inedible

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

We were delayed for a “couple of maintenance issues.” They were resolved rather quickly but a computer glitch caused someone in the airport to have to bring a physical copy of the paperwork so we could leave. I don’t know where they had to drive from to get to our plane but it took forever & we were 1 1/2 hrs late in leaving. The flight itself was fine.

We didn't take off until an hour after we boarded.

The flight was fine. This survey is not. There is no option for N/A so items which don’t apply to my experience still must be rated. In those instances I give a “3” rating which ultimately skews the results.

The actual trip was fine, however, the changes made to our flights and the layovers were had to endure were awful.

Flight from Dallas to OKC was good, but my trip was interrupted due to a delayed flight from Austin to DFW, which happens all the time. I frequently miss my connection from DFW and American can never seem to make this work!

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

Information on your arrival and departure airports

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