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Harlingen

$358+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — HRL
Jul 7 — Jul 141
Tue 7/7
Tue 7/14
1 adult, Economy
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Cheap flight deals from Ontario to Harlingen

Cheapest flights from Ontario to Harlingen
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 June 7, 2026.

This Southwest deal was found by Cheapflights users on 6/7. 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 8/188:25 am
ONT
-
HRL
1 stop6h 20m
Southwest
Tue 8/254:25 pm
HRL
-
ONT
1 stop7h 40m
Southwest
Deal found 6/7$358
This United Airlines deal was found by Cheapflights users on 6/7. 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
1 stop6h 41m
United Airlines
Deal found 6/7$403
This United Airlines deal was found by Cheapflights users on 6/6. 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 9/296:00 am
ONT
-
HRL
1 stop7h 59m
United Airlines
Wed 9/302:00 pm
HRL
-
ONT
2 stops10h 59m
United Airlines
Deal found 6/6$408
This American Airlines deal was found by Cheapflights users on 6/4. 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 7/57:15 pm
ONT
-
HRL
2 stops12h 57m
American Airlines
Sat 7/115:18 pm
HRL
-
ONT
1 stop8h 41m
American Airlines
Deal found 6/4$424
This Southwest deal was found by Cheapflights users on 6/7. 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 7/141:05 pm
ONT
-
HRL
1 stop8h 00m
Southwest
Sat 7/255:10 pm
HRL
-
ONT
1 stop7h 25m
Southwest
Deal found 6/7$428
This Southwest deal was found by Cheapflights users on 6/5. 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 7/55:30 am
ONT
-
HRL
2 stops8h 30m
Southwest
Sat 7/114:10 pm
HRL
-
ONT
1 stop5h 40m
Southwest
Deal found 6/5$432

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 June 7, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$358
(Southwest)

Popular in

November

Cheapest in

August

Average price

$629
Provider with most accurate pricing for Ontario-Harlingen Valley Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Harlingen Valley Intl flights.
Search Deals
From Ontario to Harlingen Valley Intl
Search Deals
Highest demand for flights based on searches. 37% potential increase in price ($258 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 13% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 June 7, 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

Price

Cheapest round-trip

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Tue 9/29

6:00 am-1:23 pm

1 stop5h 23m

Harlingen Valley Intl

Wed 9/30

2:00 pm-10:59 pm

2 stops10h 59m

$408

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Tue 7/14

1:05 pm-11:05 pm

1 stop8h 00m

Harlingen Valley Intl

Sat 7/25

5:10 pm-10:35 pm

1 stop7h 25m

$428
Quickest round-trip

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Sun 7/5

2:40 pm-11:55 pm

1 stop7h 15m

Harlingen Valley Intl

Sat 7/11

4:10 pm-7:50 pm

1 stop5h 40m

$476

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Fri 6/19

5:45 am-3:59 pm

1 stop8h 14m

Harlingen Valley Intl

Tue 6/23

5:20 pm-9:55 pm

1 stop6h 35m

$519

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Fri 6/19

5:45 am-3:59 pm

1 stop8h 14m

Harlingen Valley Intl

Mon 6/22

5:20 pm-9:55 pm

1 stop6h 35m

$519

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

$532
Cheapest one-way

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Wed 8/12

5:00 am-3:59 pm

2 stops8h 59m

$375

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Tue 7/21

6:00 am-9:54 pm

2 stops13h 54m

$403
Quickest one-way

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Sun 7/5

5:45 am-1:30 pm

1 stop5h 45m

$553

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/4

Sorted 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 June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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 Ontario to Harlingen

How much does it cost to fly round-trip from Ontario 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 June 7, 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.
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Southwest
8.0
Very good
4,256 reviews
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
American Airlines
7.1
Good
11,648 reviews
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

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.

  • How long is the flight from Ontario to Harlingen?

    A quick flight from Ontario to Harlingen can take about 5h 23m. United Airlines provides one of the quickest options available for as low as $408. The distance from Ontario to Harlingen is about 1305 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ontario to Harlingen round-trip?

    Southwest, at $250, was found to be the cheapest airline from Ontario to Harlingen. An alternate airline flying to your destination would be American Airlines. Southwest is priced at 43% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Ontario to Harlingen that include hotel bookings?

    Yes. In addition to deals on Ontario to Harlingen flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Harlingen?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Harlingen.

  • Can I find deals for business class flights from Ontario to Harlingen?

    Yes. Cheapflights offers flight deals from Ontario to Harlingen by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Ontario to Harlingen

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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 June 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$250Average$263FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$256Average$487FlexibilityNo cancel feeOn-time71%

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