DEN - HRL

$99 Find Cheap Flights from Denver to Harlingen

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Harlingen departing on 2/26. 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 Harlingen

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

Cheapest round-trip
$232
Overall average: $344
Southwest
Wed 3/4Sat 3/7
DEN - HRL • 1 stop
Cheapest non-stop
$543
United Airlines
Sat 3/14Sat 3/21
DEN - HRL • Non-stop
Top airlines
Southwest
Cheapest • from $232 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
October
Cheapest • 20% price drop
March
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 Denver to Harlingen 1 day a week: Sat.
Direct flights
Direct flights
Direct flights
Direct flights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Harlingen!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Denver to Harlingen (DEN-HRL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to Harlingen 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 Denver to Harlingen

Wed, Mar 4 - Sat, Mar 7
Southwest Logo
8:35 am - 5:05 pm
DEN
-
HRL
7h 30m
1 stop
Southwest Logo
5:05 am - 12:45 pm
HRL
-
DEN
8h 40m
1 stop
$232Southwest
Wed, Mar 4 - Sat, Mar 7
Southwest Logo
9:50 am - 5:05 pm
DEN
-
HRL
6h 15m
2 stops
Southwest Logo
5:05 am - 12:45 pm
HRL
-
DEN
8h 40m
1 stop
$238Southwest
Sat, Feb 14 - Fri, Feb 20
American Airlines Logo
12:33 pm - 6:16 pm
DEN
-
HRL
4h 43m
1 stop
American Airlines Logo
8:06 pm - 11:54 pm
HRL
-
DEN
4h 48m
1 stop
$253American Airlines
Thu, Mar 26 - Sun, Mar 29
Southwest Logo
6:00 am - 11:45 am
DEN
-
HRL
4h 45m
1 stop
Southwest Logo
5:30 am - 11:25 am
HRL
-
DEN
6h 55m
2 stops
$288Southwest
Wed, Mar 4 - Sat, Mar 7
Southwest Logo
8:45 am - 5:05 pm
DEN
-
HRL
7h 20m
2 stops
Southwest Logo
12:10 pm - 5:15 pm
HRL
-
DEN
6h 05m
2 stops
$292Southwest
Wed, Feb 18 - Sun, Feb 22
American Airlines Logo
8:00 am - 2:14 pm
DEN
-
HRL
5h 14m
1 stop
American Airlines Logo
8:06 pm - 11:54 pm
HRL
-
DEN
4h 48m
1 stop
$298American Airlines
Thu, Feb 26 - Sun, Mar 1
Southwest Logo
4:05 pm - 10:10 pm
DEN
-
HRL
5h 05m
1 stop
Southwest Logo
8:05 pm - 11:55 pm
HRL
-
DEN
4h 50m
1 stop
$318Southwest
Wed, Feb 18 - Sun, Feb 22
American Airlines Logo
10:20 am - 6:16 pm
DEN
-
HRL
6h 56m
1 stop
American Airlines Logo
8:06 pm - 11:54 pm
HRL
-
DEN
4h 48m
1 stop
$338American Airlines
Thu, Mar 26 - Sun, Mar 29
Southwest Logo
3:00 pm - 12:05 am
DEN
-
HRL
8h 05m
2 stops
Southwest Logo
5:30 am - 11:25 am
HRL
-
DEN
6h 55m
2 stops
$339Southwest
Wed, Feb 25 - Sun, Mar 1
Southwest Logo
2:10 pm - 9:50 pm
DEN
-
HRL
6h 40m
1 stop
Southwest Logo
6:00 pm - 11:35 pm
HRL
-
DEN
6h 35m
2 stops
$343Southwest
Booking Insights

KAYAK's insights & trends for Denver to Harlingen flights

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Harlingen, 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 Denver to Harlingen is October, where tickets cost $259 (return) on average. On the other hand, the most expensive months are April and September, where the average cost of round-trip tickets is $368 and $368 respectively.

Find deals

Good to know

Low seasonJune
Cheapest flight$99
Best time to beat the crowds but there is an average 7% increase in price.
Most popular time to fly with an average 6% increase in price.
Flight from Denver to Harlingen

When to book flights from Denver to Harlingen

Are your dates flexible? Find out the best times to travel from Denver to Harlingen 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 Denver to Harlingen

  • What is the cheapest flight from Denver to Harlingen?

    In the last 3 days, the lowest price for a flight from Denver to Harlingen was $99 for a one-way ticket and $232 for a round-trip.

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

    A passport is not required to fly from Denver to Harlingen.

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

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

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

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

  • Which airline alliances offer flights from Denver to Harlingen?

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

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

    The two airlines most popular with KAYAK users for flights from Denver to Harlingen are Southwest and American Airlines. With an average price for the route of $309 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 $360 and an overall rating of 7.2.

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

    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 Denver to Harlingen.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Harlingen from Denver 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 Denver to Harlingen?

    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 Harlingen with an airline and back to Denver with another airline. Booking your flights between Denver and HRL 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 Denver to Harlingen?

    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 Harlingen from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from Denver to Harlingen?

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

Direct departures

Denver Intl to Harlingen Valley Intl

Saturday

United Airlines

United Airlines

See more direct flights

Direct returns

Harlingen Valley Intl to Denver Intl

Saturday

United Airlines

United Airlines

See more direct flights

Reviews of the top airlines flying from Denver to Harlingen

 
See real verified KAYAK customer reviews for airlines flying from Denver to Harlingen. 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 Denver to Harlingen? 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 4267 reviews
7.0Food
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
Airline reviews

Everything went smoothly and we even arrived a little bit early.

10.0 ExcellentAmy, Jan 2026
DEN - STL
Read more Southwest reviews

Everything went smoothly and we even arrived a little bit early.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

No delays and arrived to destination 30 min early. Staff was super friendly.

Everything a cheap airline should be at normal airline rates.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Connecting flight is on time and boarding was a breeze!

WiFi did not work. For as outrageous as these flights cost, when they’re advertised with certain services/ features they should be in working order

Crew was helpful and cheerful especially when they had no refreshments to work with. The plane was never serviced and had nothing but limited water and coffee onboard. For the price point, a concern of services.

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.

2 hour delay due to equipment failure. No updates via the app and airport screens (which continued to show a departure time in the past). AA eventually switched planes and the new plane was not catered or cleaned correctly.

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.

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

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.

The seats from lax to DFW was so tight that I could not move my legs . No WiFi and had to pay . Not a good selection of entertainment

The flight was good. We had to spend almost an hour on the tarmac when we arrived in Dallas. Waiting for a gate. What’s the point of arriving early if you have no gate to park at?

Lower WiFi prices; allow us to see our flight on a map; more variety of drink choices.

Kayak was among the missing. There was not the usual advice regarding next gate after arriving in Dallas. No communication after the reminder to check in before the Moline flight. What happened?

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

Information on your arrival and departure airports

Denver (DEN)
Harlingen (HRL)