$188+ Cheap flights from Harlingen to Denver (HRL - DEN)
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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — DEN
Oct 15 — Oct 221
Round-trip
1 adult, Economy
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Find cheap flights from Harlingen to Denver 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 Harlingen to Denver
Cheapest
Best
Last-minute
One-way
Cheapest flights from Harlingen to DenverExplore the most affordable flight options available from Harlingen to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
Explore the most affordable flight options available from Harlingen to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
This Southwest deal was found by Cheapflights users on 9/10. 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 10/276:15 am -
1 stop5h 00m
Mon 11/25:35 am -
1 stop5h 45m
Deal found 9/10![Southwest logo]()
$217
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.
Wed 12/164:30 pm -
1 stop6h 30m
Thu 12/175:05 am -
1 stop4h 05m
Deal found 9/14![Southwest logo]()
$221
This Southwest deal was found by Cheapflights users on 9/10. 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 11/194:30 pm -
1 stop6h 30m
Mon 11/235:05 am -
1 stop4h 05m
Deal found 9/10![Southwest logo]()
$262
This Southwest deal was found by Cheapflights users on 9/10. 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 11/1011:35 am -
2 stops7h 25m
Wed 11/111:10 pm -
2 stops7h 35m
Deal found 9/10![Southwest logo]()
$272
This Southwest deal was found by Cheapflights users on 9/10. 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.
Fri 11/275:50 am -
2 stops6h 20m
Wed 12/28:25 am -
2 stops7h 55m
Deal found 9/10![Southwest logo]()
$304
This Southwest deal was found by Cheapflights users on 9/10. 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 11/194:30 pm -
1 stop6h 30m
Tue 11/244:30 pm -
1 stop6h 35m
Deal found 9/10![Southwest logo]()
$306
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 11/107:10 am -
1 stop5h 57m
Wed 11/114:44 pm -
1 stop5h 04m
Deal found 9/10![United Airlines logo]()
$307
Best flights from Harlingen to DenverDiscover carefully curated flight deals from Harlingen to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
Discover carefully curated flight deals from Harlingen to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 11/105:05 am -
1 stop8h 02m
Wed 11/114:44 pm -
1 stop5h 04m
Deal found 9/10![United Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 9/10. 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 10/276:15 am -
1 stop5h 00m
Mon 11/25:35 am -
1 stop5h 45m
Deal found 9/10![Southwest logo]()
$217
This Southwest deal was found by Cheapflights users on 9/10. 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 11/194:30 pm -
1 stop6h 30m
Tue 11/244:30 pm -
1 stop6h 35m
Deal found 9/10![Southwest logo]()
$306
This Southwest deal was found by Cheapflights users on 9/10. 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 11/194:30 pm -
1 stop6h 30m
Wed 11/254:30 pm -
1 stop6h 35m
Deal found 9/10![Southwest logo]()
$332
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.
Thu 10/155:30 pm -
1 stop6h 10m
Mon 10/193:15 pm -
2 stops7h 25m
Deal found 9/14![Southwest logo]()
$355
This Southwest deal was found by Cheapflights users on 9/12. 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.
Sun 9/276:00 am -
1 stop6h 10m
Thu 10/14:10 pm -
1 stop6h 25m
Deal found 9/12![Southwest logo]()
$399
Last-minute flights from Harlingen to DenverDiscover last-minute flight deals from Harlingen to Denver. Data last updated September 15, 2026 and is based on user searches.
Discover last-minute flight deals from Harlingen to Denver. Data last updated September 15, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 9/12. 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.
Sun 9/276:00 am -
1 stop6h 10m
Thu 10/14:10 pm -
1 stop6h 25m
Deal found 9/12![Southwest logo]()
$399
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.
Sun 10/116:00 am -
2 stops5h 45m
Sun 10/186:00 am -
1 stop5h 00m
Deal found 9/13![Southwest logo]()
$409
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.
Thu 10/1511:55 am -
1 stop4h 15m
Mon 10/197:10 am -
1 stop4h 05m
Deal found 9/14![Southwest logo]()
$329
This Southwest deal was found by Cheapflights users on 9/12. 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.
Fri 10/165:30 pm -
1 stop6h 10m
Mon 10/194:10 pm -
1 stop6h 30m
Deal found 9/12![Southwest logo]()
$349
This Southwest deal was found by Cheapflights users on 9/10. 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 10/276:15 am -
1 stop5h 00m
Mon 11/25:35 am -
1 stop5h 45m
Deal found 9/10![Southwest logo]()
$217
One-way flights from Harlingen to DenverSearch for one-way flight options from Harlingen to Denver. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
Search for one-way flight options from Harlingen to Denver. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
This American Airlines deal was found by Cheapflights users on 9/10. 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 9/193:35 pm -
1 stop5h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![American Airlines logo]()
$188
This American Airlines deal was found by Cheapflights users on 9/11. 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.
Thu 9/248:00 pm -
1 stop4h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![American Airlines logo]()
$242
This Southwest deal was found by Cheapflights users on 9/11. 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 9/246:20 am -
2 stops6h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Southwest logo]()
$247
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 9/195:18 pm -
2 stops16h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![United Airlines logo]()
$443
Find flight deals from Harlingen to Denver
Discover tips and strategies to find the most affordable flight options for your journey from Harlingen (HRL) to Denver (DEN). 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 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $217 (Southwest) |
One-way from | $188 (American Airlines) |
Popular in | September |
Cheapest in | August |
Average price | $580 |
Cheapflights Fare Finder
Customize your flight search to find flights from Harlingen to Denver 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 15, 2026.
Use the filters below to find and compare flights from Harlingen to Denver that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Tue 11/10
5:05 am-12:07 pm
1 stop8h 02m
Denver Intl
Wed 11/11
4:44 pm-10:48 pm
1 stop5h 04m
$217
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Tue 10/27
6:15 am-10:15 am
1 stop5h 00m
Denver Intl
Mon 11/2
5:35 am-12:20 pm
1 stop5h 45m
$217
Quickest round-trip
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Thu 9/24
6:20 am-11:25 am
2 stops6h 05m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$247
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Thu 11/19
4:30 pm-10:00 pm
1 stop6h 30m
Denver Intl
Tue 11/24
4:30 pm-12:05 am
1 stop6h 35m
$306
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Thu 11/19
4:30 pm-10:00 pm
1 stop6h 30m
Denver Intl
Wed 11/25
4:30 pm-12:05 am
1 stop6h 35m
$332
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Thu 10/15
5:30 pm-10:40 pm
1 stop6h 10m
Denver Intl
Mon 10/19
3:15 pm-11:40 pm
2 stops7h 25m
$355
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Sun 9/27
6:00 am-11:10 am
1 stop6h 10m
Denver Intl
Thu 10/1
4:10 pm-11:35 pm
1 stop6h 25m
$399
HarlingenDenver
HRL Harlingen Valley Intl - DEN Denver Intl
HRLDEN
Harlingen Valley Intl
Sat 9/19
5:18 pm-8:56 am
2 stops16h 38m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$443
Sorted by cheapest first
Compare providers for flights from Harlingen to Denver
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 Harlingen to Denver 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 Harlingen-Denver flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Harlingen-Denver flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Harlingen-Denver flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Harlingen-Denver 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 Harlingen-Denver 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 Harlingen to Denver
Have a flexible travel schedule? Discover the best time to fly to Denver from Harlingen with our price prediction graph.
HRL-DEN
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 Harlingen to Denver
Reviews of airlines servicing Denver
Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated September 15, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican Airlines from Harlingen to Denver by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Harlingen to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Denver?
Book flights to Denver if you plan to visit one of these locationsThornton
Westminster
Lakewood
Centennial
Black Hawk
Broomfield
Golden
Wheat Ridge
Silverthorne
Central City
Fort Morgan
Greeley
Cripple Creek
Frisco
Winter Park
Limon
Englewood
Manitou Springs
Glendale
Evergreen
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Harlingen to Denver
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Complete your trip
Complete your trip to Denver by adding a car rental and/or hotel reservation to your travel itinerary.
Other flights to Denver
Explore flights to Denver departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2026.
Search flights from Harlingen to Denver by cabin class
Find flights from Harlingen to Denver, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Harlingen and Denver flights
Browse other Harlingen and Denver flight options. Last updated on September 15, 2026.
Other flights from Harlingen
Browse through other flights departing from Harlingen. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 3 airlines flying from Harlingen to Denver
Discover the top 3 airlines that operate flights from Harlingen to Denver. 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 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$197 | Average$338 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$223 | Average$352 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$338 | FlexibilityNo cancel fee | On-time69% |