$186+ Cheap flights from Denver to Harlingen (DEN - HRL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/21. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — HRL
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Denver to Harlingen with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Denver to Harlingen
Cheapest
Best
Last-minute
One-way
Cheapest flights from Denver to HarlingenExplore the most affordable flight options available from Denver to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from Denver to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/101:10 pm -
1 stop6h 35m
Tue 11/174:30 pm -
1 stop6h 35m
Deal found 9/15![Southwest logo]()
$195
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 am -
1 stop6h 15m
Tue 11/34:30 pm -
1 stop6h 30m
Deal found 9/16![Southwest logo]()
$207
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/31:10 pm -
2 stops7h 40m
Sun 12/65:50 am -
2 stops6h 20m
Deal found 9/16![Southwest logo]()
$315
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/39:03 am -
1 stop5h 02m
Wed 10/76:42 pm -
1 stop6h 16m
Deal found 9/17![American Airlines logo]()
$343
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/218:00 am -
1 stop6h 00m
Tue 12/225:45 pm -
1 stop7h 35m
Deal found 9/13![Southwest logo]()
$371
Best flights from Denver to HarlingenDiscover carefully curated flight deals from Denver to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Denver to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:45 pm -
2 stops8h 05m
Tue 11/177:25 am -
2 stops7h 10m
Deal found 9/15![Southwest logo]()
$205
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/14:20 pm -
1 stop4h 32m
Sun 10/45:05 am -
1 stop6h 02m
Deal found 9/13![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 am -
1 stop6h 15m
Tue 11/34:30 pm -
1 stop6h 30m
Deal found 9/16![Southwest logo]()
$207
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/288:30 am -
1 stop6h 30m
Sun 1/317:20 am -
2 stops6h 20m
Deal found 9/16![Southwest logo]()
$310
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/264:44 pm -
1 stop5h 04m
Fri 10/305:05 am -
1 stop4h 57m
Deal found 9/14![United Airlines logo]()
$376
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/217:00 am -
1 stop7h 00m
Tue 12/225:45 pm -
2 stops7h 25m
Deal found 9/13![Southwest logo]()
$376
Last-minute flights from Denver to HarlingenDiscover last-minute flight deals from Denver to Harlingen. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Harlingen. Data last updated September 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:26 am -
1 stop6h 39m
Wed 9/305:28 pm -
1 stop6h 06m
Deal found 9/14![American Airlines logo]()
$395
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:10 am -
2 stops6h 40m
Wed 9/304:25 pm -
1 stop4h 25m
Deal found 9/14![Southwest logo]()
$400
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:25 am -
1 stop3h 55m
Fri 10/25:30 am -
1 stop4h 50m
Deal found 9/13![Southwest logo]()
$399
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3012:50 pm -
1 stop6h 25m
Sun 10/47:35 am -
1 stop4h 20m
Deal found 9/15![Southwest logo]()
$397
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/14:20 pm -
1 stop4h 32m
Sun 10/45:05 am -
1 stop6h 02m
Deal found 9/13![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:15 pm -
2 stops7h 20m
Sun 10/47:35 am -
1 stop4h 20m
Deal found 9/13![Southwest logo]()
$393
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/39:03 am -
1 stop5h 02m
Wed 10/76:42 pm -
1 stop6h 16m
Deal found 9/17![American Airlines logo]()
$343
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/264:44 pm -
1 stop5h 04m
Fri 10/305:05 am -
1 stop4h 57m
Deal found 9/14![United Airlines logo]()
$376
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 am -
1 stop6h 15m
Tue 11/34:30 pm -
1 stop6h 30m
Deal found 9/16![Southwest logo]()
$207
One-way flights from Denver to HarlingenSearch for one-way flight options from Denver to Harlingen. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Denver to Harlingen. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/217:00 am -
1 stop7h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Southwest logo]()
$186
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/285:00 am -
1 stop4h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Southwest logo]()
$249
Find flight deals from Denver to Harlingen
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Harlingen (HRL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $195 (Southwest) |
One-way from | $186 (Southwest) |
Popular in | July |
Cheapest in | February |
Average price | $388 |
Good round-trip deal | $476 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Denver to Harlingen that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
Use the filters below to find and compare flights from Denver to Harlingen that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Mon 12/21
7:00 am-3:00 pm
1 stop7h 00m
Harlingen Valley Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$186
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Tue 11/10
12:45 pm-9:50 pm
2 stops8h 05m
Harlingen Valley Intl
Tue 11/17
7:25 am-1:35 pm
2 stops7h 10m
$205
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Thu 10/29
5:00 am-12:15 pm
1 stop6h 15m
Harlingen Valley Intl
Tue 11/3
4:30 pm-10:00 pm
1 stop6h 30m
$207
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Thu 1/28
8:30 am-4:00 pm
1 stop6h 30m
Harlingen Valley Intl
Sun 1/31
7:20 am-12:40 pm
2 stops6h 20m
$310
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Thu 10/1
4:20 pm-9:52 pm
1 stop4h 32m
Harlingen Valley Intl
Sun 10/4
5:05 am-10:07 am
1 stop6h 02m
$374
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Mon 10/26
4:44 pm-10:48 pm
1 stop5h 04m
Harlingen Valley Intl
Fri 10/30
5:05 am-9:02 am
1 stop4h 57m
$376
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Mon 12/21
7:00 am-3:00 pm
1 stop7h 00m
Harlingen Valley Intl
Tue 12/22
5:45 pm-12:10 am
2 stops7h 25m
$376
Quickest round-trip
DenverHarlingen
DEN Denver Intl - HRL Harlingen Valley Intl
DENHRL
Denver Intl
Sat 11/28
8:00 am-3:45 pm
2 stops6h 45m
Harlingen Valley Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$382
Sorted by cheapest first
Compare providers for flights from Denver to Harlingen
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Harlingen in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Denver-Harlingen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Harlingen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-Harlingen flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Denver-Harlingen flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Harlingen flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Denver to Harlingen
Have a flexible travel schedule? Discover the best time to fly to Harlingen from Denver with our price prediction graph.
DEN-HRL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Denver to Harlingen
Reviews of airlines servicing Harlingen
Get insights into the airlines that provide service to Harlingen. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Harlingen. Reviews last updated September 17, 2026.
Read through reviews of airlines operating flights from Denver to Harlingen, such as Southwest and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Related info for your journey
Find useful and relevant information for your journey from Denver to Harlingen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Denver to Harlingen
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Complete your trip
Complete your trip to Harlingen by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Denver to Harlingen by cabin class
Find flights from Denver to Harlingen, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Harlingen
Explore flights to Harlingen departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Denver and Harlingen flights
Browse other Denver and Harlingen flight options. Last updated on September 17, 2026.
Other flights from Denver
Browse through other flights departing from Denver. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Denver to Harlingen
Discover the top 2 airlines that operate flights from Denver to Harlingen. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$199 | Average$337 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$266 | Average$476 | FlexibilityNo cancel fee | On-time69% |