ONT - HRL

$129 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 9/12. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Bundle and saveSave money when you bundle your flight + hotel.

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Everything you should know

Cheapest round-trip
$328
American Airlines
Sun 5/24Thu 5/28
ONT - HRL • 1 stop
Cheapest one-way
$129
United Airlines
Sat 9/12
ONT - HRL • 1 stop
Top airlines
Cheapest • from $328 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Harlingen. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $263 (round-trip)
Shortest trip • 7h 20m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
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

Sun, May 24 - Thu, May 28
American Airlines Logo
11:59 pm - 10:13 am
ONT
-
HRL
8h 14m
1 stop
American Airlines Logo
8:04 pm - 11:59 pm
HRL
-
ONT
5h 55m
1 stop
$328American Airlines
Wed, Sep 9 - Thu, Sep 10
United Airlines Logo
5:45 am - 3:34 pm
ONT
-
HRL
7h 49m
1 stop
United Airlines Logo
5:16 pm - 9:59 pm
HRL
-
ONT
6h 43m
1 stop
$347United Airlines
Sun, May 24 - Thu, May 28
American Airlines Logo
1:10 pm - 12:14 am
ONT
-
HRL
9h 04m
2 stops
American Airlines Logo
8:04 pm - 11:59 pm
HRL
-
ONT
5h 55m
1 stop
$359American Airlines
Tue, Sep 22 - Wed, Sep 23
United Airlines Logo
5:45 am - 3:34 pm
ONT
-
HRL
7h 49m
1 stop
United Airlines Logo
5:16 pm - 9:59 pm
HRL
-
ONT
6h 43m
1 stop
$397United Airlines
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
5:45 am - 3:34 pm
ONT
-
HRL
7h 49m
1 stop
United Airlines Logo
7:27 am - 6:11 pm
HRL
-
ONT
12h 44m
2 stops
$402United Airlines
Thu, Oct 1 - Mon, Oct 5
United Airlines Logo
6:00 am - 3:58 pm
ONT
-
HRL
7h 58m
1 stop
United Airlines Logo
5:18 pm - 9:58 pm
HRL
-
ONT
6h 40m
1 stop
$403United Airlines
Wed, Sep 9 - Thu, Sep 10
United Airlines Logo
5:45 am - 3:34 pm
ONT
-
HRL
7h 49m
1 stop
United Airlines Logo
5:15 am - 12:12 pm
HRL
-
ONT
8h 57m
2 stops
$408United Airlines
Wed, Sep 9 - Sat, Sep 12
United Airlines Logo
5:00 am - 9:44 pm
ONT
-
HRL
14h 44m
2 stops
United Airlines Logo
5:16 pm - 9:59 pm
HRL
-
ONT
6h 43m
1 stop
$411United Airlines
Sun, May 24 - Thu, May 28
American Airlines Logo
1:10 pm - 12:14 am
ONT
-
HRL
9h 04m
2 stops
American Airlines Logo
10:43 am - 6:22 pm
HRL
-
ONT
9h 39m
2 stops
$413American Airlines
Tue, Sep 22 - Wed, Sep 23
United Airlines Logo
5:45 am - 3:34 pm
ONT
-
HRL
7h 49m
1 stop
United Airlines Logo
5:15 am - 8:04 pm
HRL
-
ONT
16h 49m
2 stops
$425United 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 cheapest month to fly from Ontario to Harlingen?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Harlingen, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Harlingen is April, where tickets cost $0 (return) on average. On the other hand, the most expensive months are November and June, where the average cost of round-trip tickets is $901 and $629 respectively.

Good to know

Low seasonAugust
Cheapest flight$129
Best time to beat the crowds with an average 44% drop in price.
Most popular time to fly with an average 12% increase in price.
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 $129 for a one-way ticket and $328 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 $487 and an overall rating of 7.1.

  • 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 4299 reviews
7.0Food
8.0Comfort
8.1Boarding
8.6Crew
7.5Entertainment
Airline reviews

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

4.0 OkayDavid, Apr 2026
COS - DAL
Read more Southwest reviews

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

The seat was not comfortable. 1D. My back was sore all night and the next day.

One of the best airlines for fast boarding, on time arrivals, and top notch service!

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

Snacks are always pretzels. Why can't you also offer peanuts ?

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

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

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

Seat comfort was poor (no lumbar or lower back support).

The passenger in front of of me reclined their seat back all the way the entire flight. Their headrest was in my face the entire flight! I barely had room for the little plastic cup of water to fit on my tray table; can you make the seats and space between the rows any smaller??? You can’t even get up to use the restroom! Worst flight I’ve had in a very long time!

My Frequent Flyer nber wasn't put on as I was told it was..... This resulted in a last group boarding and no priority tags on My bags.

Cancelled the flight half hour before boarding. Then cancelled the connecting flight too.

I would like a refund for the extra cost the seat I paid for. An oversized person sat next to me and I couldn’t fit on my seat and had to move to another seat.

This was a hard flight. 3 delays out of OKC (1 on the Tarmac). Delay in Atlanta coming to Dallas. total travel time was the equivalent of driving from OKC to Atlanta.

Got home at 3am after deboarding the plane. No compensation offered by American

Flights on time w/o delays. However, my baggage was damaged. Ground crew, throws baggage from plane to the baggage carrier, carelessly.

Business class was very good, one of my best flights

American flight was diverted and delayed but app didn’t show that information so I wasn’t able to change my connection until the last min.

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

Information on your arrival and departure airports