$144+ Cheap flights from Ontario to Harlingen (ONT - HRL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — HRL
Aug 15 — Aug 221
Round-trip
1 adult, Economy
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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
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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
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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 July 16, 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 July 16, 2026.
This Southwest deal was found by Cheapflights users on 7/13. 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 8/1012:50 pm
ONT
- HRL
1 stop5h 40m
Southwest
Mon 8/175:30 am
HRL
- ONT
1 stop5h 45m
Southwest
Deal found 7/13![Southwest logo]()
$343
This American Airlines deal was found by Cheapflights users on 7/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:37 pm
ONT
- HRL
1 stop8h 11m
American Airlines
Mon 10/56:42 pm
HRL
- ONT
1 stop7h 10m
American Airlines
Deal found 7/12![American Airlines logo]()
$374
This American Airlines deal was found by Cheapflights users on 7/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3012:37 pm
ONT
- HRL
1 stop8h 11m
American Airlines
Sun 10/45:51 am
HRL
- ONT
1 stop5h 38m
American Airlines
Deal found 7/12![American Airlines logo]()
$393
This American Airlines deal was found by Cheapflights users on 7/13. 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 9/102:22 pm
ONT
- HRL
1 stop6h 26m
American Airlines
Sun 9/138:00 pm
HRL
- ONT
1 stop5h 36m
American Airlines
Deal found 7/13![American Airlines logo]()
$457
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:01 am
ONT
- HRL
2 stops28h 58m
United Airlines
Sat 8/291:59 pm
HRL
- ONT
1 stop6h 13m
United Airlines
Deal found 7/12![United Airlines logo]()
$466
This American Airlines deal was found by Cheapflights users on 7/13. 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 9/1112:37 pm
ONT
- HRL
1 stop8h 11m
American Airlines
Sun 9/135:51 am
HRL
- ONT
1 stop5h 38m
American Airlines
Deal found 7/13![American Airlines logo]()
$478
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 July 16, 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 July 16, 2026.
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/810:15 am
ONT
- HRL
2 stops6h 35m
Southwest
Tue 8/114:25 pm
HRL
- ONT
1 stop7h 40m
Southwest
Deal found 7/10![Southwest logo]()
$344
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
ONT
- HRL
1 stop7h 59m
United Airlines
Mon 10/55:18 pm
HRL
- ONT
2 stops23h 53m
United Airlines
Deal found 7/12![United Airlines logo]()
$466
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:01 am
ONT
- HRL
2 stops28h 58m
United Airlines
Sat 8/291:59 pm
HRL
- ONT
1 stop6h 13m
United Airlines
Deal found 7/12![United Airlines logo]()
$466
This United Airlines deal was found by Cheapflights users on 7/13. 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.
Sat 9/125:00 am
ONT
- HRL
2 stops14h 52m
United Airlines
Sun 9/135:18 pm
HRL
- ONT
1 stop6h 41m
United Airlines
Deal found 7/13![United Airlines logo]()
$530
This United Airlines deal was found by Cheapflights users on 7/14. 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.
Sat 8/221:56 pm
ONT
- HRL
2 stops24h 03m
United Airlines
Wed 8/261:59 pm
HRL
- ONT
2 stops24h 13m
United Airlines
Deal found 7/14![United Airlines logo]()
$568
Last-minute flights from Ontario to HarlingenDiscover last-minute flight deals from Ontario to Harlingen. Data last updated July 16, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Harlingen. Data last updated July 16, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 7/14. 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 7/232:00 pm
ONT
- HRL
1 stop5h 45m
Southwest
Thu 7/305:15 am
HRL
- ONT
1 stop5h 40m
Southwest
Deal found 7/14![Southwest logo]()
$549
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/811:55 am
ONT
- HRL
1 stop7h 00m
Southwest
Tue 8/114:25 pm
HRL
- ONT
1 stop7h 40m
Southwest
Deal found 7/10![Southwest logo]()
$338
This Southwest deal was found by Cheapflights users on 7/13. 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 8/1012:50 pm
ONT
- HRL
1 stop5h 40m
Southwest
Mon 8/175:30 am
HRL
- ONT
1 stop5h 45m
Southwest
Deal found 7/13![Southwest logo]()
$343
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:01 am
ONT
- HRL
2 stops28h 58m
United Airlines
Sat 8/291:59 pm
HRL
- ONT
1 stop6h 13m
United Airlines
Deal found 7/12![United Airlines logo]()
$466
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 July 16, 2026.
Search for one-way flight options from Ontario to Harlingen. Find affordable one-way fares based on user searches. Data last updated July 16, 2026.
This American Airlines deal was found by Cheapflights users on 7/11. 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.
Wed 8/122:27 pm
ONT
- HRL
1 stop6h 27m
American Airlines
Deal found 7/11![American Airlines logo]()
$144
This Southwest deal was found by Cheapflights users on 7/13. 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 9/1012:50 pm
ONT
- HRL
2 stops7h 45m
Southwest
Deal found 7/13![Southwest logo]()
$149
This Southwest deal was found by Cheapflights users on 7/11. 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.
Wed 8/128:35 am
ONT
- HRL
2 stops9h 35m
Southwest
Deal found 7/11![Southwest logo]()
$155
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/146:00 am
ONT
- HRL
1 stop7h 59m
United Airlines
Deal found 7/12![United Airlines logo]()
$269
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/285:00 am
ONT
- HRL
2 stops12h 49m
United Airlines
Deal found 7/12![United Airlines logo]()
$280
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:45 am
ONT
- HRL
1 stop5h 45m
United Airlines
Deal found 7/12![United Airlines logo]()
$330
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/79:00 am
ONT
- HRL
2 stops11h 51m
United Airlines
Deal found 7/12![United Airlines logo]()
$335
This United Airlines deal was found by Cheapflights users on 7/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:08 am
ONT
- HRL
3 stops13h 44m
United Airlines
Deal found 7/11![United Airlines logo]()
$483
This United Airlines deal was found by Cheapflights users on 7/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/105:45 am
ONT
- HRL
1 stop5h 45m
United Airlines
Deal found 7/11![United Airlines logo]()
$490
This United Airlines deal was found by Cheapflights users on 7/13. 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 9/105:00 am
ONT
- HRL
3 stops12h 39m
United Airlines
Deal found 7/13![United Airlines logo]()
$499
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 July 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $338 (Southwest) |
One-way from | $144 (American Airlines) |
Popular in | May |
Cheapest in | June |
Average price | $566 |
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 2,558,603 searches. Data last updated July 16, 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
Quickest round-trip
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Sat 8/8
10:15 am-6:50 pm
2 stops6h 35m
Harlingen Valley Intl
Tue 8/11
4:25 pm-10:05 pm
1 stop7h 40m
$344
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Thu 10/1
6:00 am-3:59 pm
1 stop7h 59m
Harlingen Valley Intl
Mon 10/5
5:18 pm-3:11 pm
2 stops23h 53m
$466
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Tue 8/25
9:01 am-3:59 pm
2 stops28h 58m
Harlingen Valley Intl
Sat 8/29
1:59 pm-6:12 pm
1 stop6h 13m
$466
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Sat 9/12
5:00 am-9:52 pm
2 stops14h 52m
Harlingen Valley Intl
Sun 9/13
5:18 pm-9:59 pm
1 stop6h 41m
$530
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Sat 8/22
1:56 pm-3:59 pm
2 stops24h 03m
Harlingen Valley Intl
Wed 8/26
1:59 pm-12:12 pm
2 stops24h 13m
$568
Cheapest one-way
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Thu 9/10
2:22 pm-10:48 pm
1 stop6h 26m
$144
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Wed 8/12
8:35 am-8:10 pm
2 stops9h 35m
$155
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Fri 8/14
6:00 am-3:59 pm
1 stop7h 59m
$269
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Tue 7/28
5:00 am-7:49 pm
2 stops12h 49m
$280
Quickest one-way
OntarioHarlingen
ONT - HRL
ONTHRL
Ontario
Wed 7/29
5:45 am-1:30 pm
1 stop5h 45m
$330
Showing 1-10 of 13 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 July.
| 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 July 16, 2026.
Read through reviews of airlines operating flights from Ontario to Harlingen, such as Southwest and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreMike,Aug 2025
OKC - AUS
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.
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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 July 16, 2026.
Ontario and Harlingen flights
Browse other Ontario and Harlingen flight options. Last updated on July 16, 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 July 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Ontario to Harlingen
Discover the top 2 airlines 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 2,558,603 searches. Data last updated July 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$250 | Average$263 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$487 | FlexibilityNo cancel fee | On-time71% |