ONT - HRL

$370 Find Cheap Flights from Ontario to Harlingen

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Harlingen departing on 2/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Harlingen

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Harlingen, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Harlingen, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$491
United Airlines
Tue 2/24Wed 2/25
ONT - HRL • 1 stop
Cheapest one-way
$370
United Airlines
Fri 2/27
ONT - HRL • 1 stop
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We hope you love your trip to Harlingen!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Harlingen (ONT-HRL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Harlingen that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Harlingen

Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
8:00 am - 4:04 pm
ONT
-
HRL
6h 04m
1 stop
United Airlines Logo
5:22 pm - 9:59 pm
HRL
-
ONT
6h 37m
1 stop
$491United Airlines
Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
8:00 am - 4:04 pm
ONT
-
HRL
6h 04m
1 stop
United Airlines Logo
5:22 pm - 9:59 pm
HRL
-
ONT
6h 37m
1 stop
$565United Airlines
Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
5:00 am - 9:59 pm
ONT
-
HRL
14h 59m
2 stops
United Airlines Logo
5:22 pm - 9:59 pm
HRL
-
ONT
6h 37m
1 stop
$615United Airlines
Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
8:00 am - 4:04 pm
ONT
-
HRL
6h 04m
1 stop
United Airlines Logo
9:20 am - 8:50 pm
HRL
-
ONT
13h 30m
2 stops
$641United Airlines
Thu, Apr 2 - Mon, Apr 6
United Airlines Logo
6:05 am - 4:04 pm
ONT
-
HRL
7h 59m
1 stop
United Airlines Logo
9:20 am - 9:50 pm
HRL
-
ONT
14h 30m
1 stop
$725United Airlines
Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
5:00 am - 9:59 pm
ONT
-
HRL
14h 59m
2 stops
United Airlines Logo
9:20 am - 8:50 pm
HRL
-
ONT
13h 30m
2 stops
$765United Airlines
Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
5:00 am - 9:59 pm
ONT
-
HRL
14h 59m
2 stops
United Airlines Logo
9:20 am - 8:50 pm
HRL
-
ONT
13h 30m
2 stops
$768United Airlines
Tue, Feb 24 - Wed, Feb 25
United Airlines Logo
6:10 am - 9:59 pm
ONT
-
HRL
13h 49m
2 stops
United Airlines Logo
9:20 am - 8:50 pm
HRL
-
ONT
13h 30m
2 stops
$770United Airlines
Fri, Feb 27 - Sun, Mar 1
United Airlines Logo
9:08 pm - 11:24 am
ONT
-
HRL
12h 16m
2 stops
United Airlines Logo
5:22 pm - 9:59 pm
HRL
-
ONT
6h 37m
1 stop
$788United Airlines
Fri, Feb 27 - Sun, Mar 1
United Airlines Logo
6:00 am - 4:04 pm
ONT
-
HRL
8h 04m
1 stop
United Airlines Logo
5:22 pm - 9:59 pm
HRL
-
ONT
6h 37m
1 stop
$827United Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Harlingen flights

Get data-powered insights and trends into flights from Ontario to Harlingen to help you find the cheapest flights, the best time to fly and much more.

What is the most popular layover airport when flying from Ontario to Harlingen?

Percentage of 1-stop round-trip flights from Ontario to Harlingen chosen by KAYAK users via each layover airport in the last 12 months (only includes trips with the same layover airport on both legs).

Dallas (DFW) is the top choice – 63% of KAYAK users who clicked on 1-stop flights from Ontario to Harlingen picked an itinerary connecting there.

What is the cheapest layover airport when flying from Ontario to Harlingen?

Average round-trip price for 1-stop flights from Ontario to Harlingen clicked by KAYAK users in the last 12 months (only includes trips with the same layover airport on both legs).

Flights via Houston (HOU) offer the most affordable fares, with an average round-trip price of $263.

Which layover airport offers the shortest total travel time from Ontario to Harlingen?

Shortest average total travel time for 1-stop one-way flights from Ontario to Harlingen via different layover airports, based on KAYAK user data from the last 12 months.

Consider flying via Dallas (DFW) for the shortest journey. The average one-way travel time for flights connecting there is 7h 03m.

Which layover airport has the quickest connection when flying from Ontario to Harlingen?

Average layover duration at different layover airports for 1-stop one-way flights from Ontario to Harlingen, based on KAYAK user data from the last 12 months.

If you prefer a quick connection, Dallas (DFW) often has the shortest layovers from Ontario to Harlingen, with an average of 2h 04m.

Good to know

Cheapest flight$370
Flight from Ontario to Harlingen

When to book flights from Ontario to Harlingen

Are your dates flexible? Find out the best times to travel from Ontario to Harlingen based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Harlingen

  • What is the cheapest flight from Ontario to Harlingen?

    In the last 3 days, the lowest price for a flight from Ontario to Harlingen was $370 for a one-way ticket and $491 for a round-trip.

  • Do I need a passport to fly between Ontario and Harlingen?

    No

  • Which aircraft models fly most regularly from Ontario to Harlingen?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Harlingen?

    oneworld is the only airline alliance operating flights between Ontario and Harlingen.

  • Which is the best airline for flights from Ontario to Harlingen, Southwest or American Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Harlingen are Southwest and American Airlines. With an average price for the route of $263 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $378 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Ontario to Harlingen?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Harlingen.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Harlingen?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Harlingen from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Harlingen?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Harlingen with an airline and back to Ontario with another airline. Booking your flights between Ontario and HRL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Harlingen?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Harlingen from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Ontario to Harlingen

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Harlingen. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Harlingen? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4280 reviews
7.0Food
8.1Boarding
8.6Crew
8.0Comfort
7.5Entertainment
Airline reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

2.0 MediocreDavid, Feb 2026
SAN - LAS
Read more Southwest reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

3 hour delay. Had to change plans and was still delayed.

No delays and arrived to destination 30 min early. Staff was super friendly.

Everything a cheap airline should be at normal airline rates.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

I am very appreciative of the help provided to me by Dennis and Whitney. I had lost my phone at EWR airport and they were very kind in assisting me. This included advice on how to file a report and also helping me connect with family. The pilot was also great about keeping passengers updated on the flight progress with regular communications over the system.

The screens were inoperable for movies and such, but everything else was just fine

Crew was helpful and cheerful especially when they had no refreshments to work with. The plane was never serviced and had nothing but limited water and coffee onboard. For the price point, a concern of services.

AA did not allow to board a flight because my connecting flight from DFW had been canceled. I got on another flight to another city. No service on the plane and I did not use their entertainment system.

2 hour delay due to equipment failure. No updates via the app and airport screens (which continued to show a departure time in the past). AA eventually switched planes and the new plane was not catered or cleaned correctly.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

They made me pay $40 to check a bag that was listed as free when I bought my ticket. Then before boarding they offered to check any bags free.

The seats from lax to DFW was so tight that I could not move my legs . No WiFi and had to pay . Not a good selection of entertainment

Everything you need to know for your flight from Ontario to Harlingen

Information on your arrival and departure airports