$134+ Cheap flights from Ontario to Harlingen (ONT - 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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — HRL
Oct 17 — Oct 241
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario 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 Ontario to Harlingen
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to HarlingenExplore the most affordable flight options available from Ontario 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 Ontario 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 9/16. 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.
Fri 11/61:20 pm -
2 stops8h 15m
Mon 11/95:50 am -
1 stop5h 25m
Deal found 9/16![Southwest logo]()
$271
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:00 am -
1 stop8h 01m
Tue 11/175:25 pm -
1 stop6h 15m
Deal found 9/15![United Airlines logo]()
$313
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:00 am -
1 stop8h 01m
Sat 10/317:10 am -
2 stops12h 51m
Deal found 9/15![United Airlines logo]()
$318
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.
Wed 9/302:22 pm -
1 stop6h 26m
Sun 10/45:51 am -
1 stop5h 38m
Deal found 9/14![American Airlines logo]()
$410
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 9/286:00 am -
1 stop7h 59m
Tue 10/65:05 am -
2 stops9h 41m
Deal found 9/14![United Airlines logo]()
$421
Best flights from Ontario to HarlingenDiscover carefully curated flight deals from Ontario 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 Ontario 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 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.
Tue 10/276:00 am -
1 stop8h 01m
Sat 10/315:05 am -
2 stops9h 28m
Deal found 9/14![United Airlines logo]()
$318
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:00 am -
1 stop8h 01m
Tue 11/175:25 pm -
1 stop6h 15m
Deal found 9/16![United Airlines logo]()
$381
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:25 am -
2 stops11h 23m
Sun 11/15:05 am -
2 stops9h 24m
Deal found 9/15![United Airlines logo]()
$421
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 am -
2 stops10h 27m
Mon 10/52:00 pm -
2 stops10h 51m
Deal found 9/16![United Airlines logo]()
$440
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:00 am -
1 stop8h 01m
Wed 11/185:05 am -
2 stops9h 28m
Deal found 9/15![United Airlines logo]()
$520
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.
Mon 9/286:00 am -
1 stop7h 59m
Sat 10/37:15 am -
2 stops10h 07m
Deal found 9/13![United Airlines logo]()
$524
Last-minute flights from Ontario to HarlingenDiscover last-minute flight deals from Ontario to Harlingen. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Harlingen. Data last updated September 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/252:22 pm -
1 stop6h 26m
Sun 10/48:00 pm -
1 stop5h 36m
Deal found 9/13![American Airlines logo]()
$449
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 9/286:00 am -
1 stop7h 59m
Tue 10/65:05 am -
2 stops9h 41m
Deal found 9/14![United Airlines logo]()
$421
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.
Wed 9/302:22 pm -
1 stop6h 26m
Sun 10/45:51 am -
1 stop5h 38m
Deal found 9/14![American Airlines logo]()
$410
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:25 am -
2 stops10h 27m
Mon 10/55:18 pm -
1 stop6h 41m
Deal found 9/15![United Airlines logo]()
$435
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:00 am -
1 stop8h 01m
Sat 10/317:10 am -
2 stops12h 51m
Deal found 9/15![United Airlines logo]()
$318
One-way flights from Ontario to HarlingenSearch for one-way flight options from Ontario to Harlingen. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Ontario to Harlingen. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/99:25 am -
2 stops11h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![United Airlines logo]()
$134
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.
Mon 11/912:40 pm -
1 stop8h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Southwest logo]()
$160
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.
Mon 9/286:00 am -
1 stop7h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![United Airlines logo]()
$260
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.
Tue 9/228:30 am -
1 stop6h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Southwest logo]()
$274
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/237:20 am -
1 stop5h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![American Airlines logo]()
$295
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/239:01 am -
2 stops10h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![United Airlines logo]()
$300
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/315:00 am -
2 stops12h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![United Airlines logo]()
$312
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:00 am -
1 stop7h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![United Airlines logo]()
$319
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/271:04 pm -
2 stops7h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![American Airlines logo]()
$335
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/241:04 pm -
2 stops7h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![American Airlines logo]()
$345
Find flight deals from Ontario to Harlingen
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) 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 | $271 (Southwest) |
One-way from | $134 (United Airlines) |
Popular in | May |
Cheapest in | June |
Average price | $344 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario 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 Ontario to Harlingen that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Mon 9/28
6:00 am-3:59 pm
1 stop7h 59m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$260
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Tue 9/22
8:30 am-4:45 pm
1 stop6h 15m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$274
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Wed 9/23
7:20 am-3:05 pm
1 stop5h 45m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$295
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Fri 9/25
6:00 am-3:59 pm
1 stop7h 59m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$295
Quickest round-trip
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Sat 9/26
6:00 am-1:23 pm
1 stop5h 23m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$295
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Tue 9/22
1:04 pm-10:48 pm
2 stops7h 44m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$300
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Sat 9/26
1:05 pm-10:48 pm
2 stops7h 43m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$300
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Wed 9/23
9:01 am-9:52 pm
2 stops10h 51m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$300
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Thu 12/31
5:00 am-7:39 pm
2 stops12h 39m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$312
OntarioHarlingen
ONT Ontario - HRL Harlingen Valley Intl
ONTHRL
Ontario
Tue 10/27
6:00 am-4:01 pm
1 stop8h 01m
Harlingen Valley Intl
Sat 10/31
5:05 am-12:33 pm
2 stops9h 28m
$318
Showing 1-10 of 15 resultsSorted by cheapest first
Compare providers for flights from Ontario 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 Ontario 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 Ontario-Harlingen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Harlingen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Harlingen flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-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 Ontario-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 Ontario to Harlingen
Have a flexible travel schedule? Discover the best time to fly to Harlingen from Ontario with our price prediction graph.
ONT-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.
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 Ontario to Harlingen, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.1
Entertainment
6.8
Boarding
7.4
Food
6.4
Comfort
7.2
Crew
7.9
Reviews
1 / 20
2.0
MediocreChi,Sep 2023
ONT - PHX
Overall
7.1
Entertainment
6.8
Boarding
7.4
Food
6.4
Comfort
7.2
Crew
7.9
Reviews
1 / 20
2.0
MediocreChi,Sep 2023
ONT - PHX
Related info for your journey
Find useful and relevant information for your journey from Ontario to Harlingen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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.
Alternative routes
Complete your trip
Flights by cabin class
Harlingen flight routes
Other flight options
Other flights from Ontario
Popular flights
Alternative routes for Ontario to Harlingen
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Harlingen by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Harlingen by cabin class
Find flights from Ontario 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.
Ontario and Harlingen flights
Browse other Ontario and Harlingen flight options. Last updated on September 17, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. 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 airline flying from Ontario to Harlingen
Discover the top airline that operate flights from Ontario 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$256 | Average$487 | FlexibilityNo cancel fee | On-time71% |