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Cheap flights from Ontario to Harlingen from $129

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Harlingen departing on 9/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Harlingen

Cheap round-trip flights

Enter your travel dates to find the best prices.
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
Sun, May 24 - Thu, May 28
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
Wed, Sep 9 - Thu, Sep 10
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
Sun, May 24 - Thu, May 28
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
Tue, Sep 22 - Wed, Sep 23
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
Wed, Sep 9 - Wed, Sep 16
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
Thu, Oct 1 - Mon, Oct 5
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 - Thu, Sep 10
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
Wed, Sep 9 - Sat, Sep 12
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
Sun, May 24 - Thu, May 28
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
Tue, Sep 22 - Wed, Sep 23

United Airlines flights from Ontario to Harlingen

Our best United Airlines deals on Ontario to Harlingen flight tickets
United Airlines
Sep 9
ONT5:45 amOntario
7h 49m
1 stop
HRL3:34 pmHarlingen Valley Intl
Sep 10
HRL5:16 pmHarlingen Valley Intl
6h 43m
1 stop
ONT9:59 pmOntario
$347
United Airlines
Sep 22
ONT5:45 amOntario
7h 49m
1 stop
HRL3:34 pmHarlingen Valley Intl
Sep 23
HRL5:16 pmHarlingen Valley Intl
6h 43m
1 stop
ONT9:59 pmOntario
$397
United Airlines
Sep 9
ONT5:45 amOntario
7h 49m
1 stop
HRL3:34 pmHarlingen Valley Intl
Sep 16
HRL7:27 amHarlingen Valley Intl
12h 44m
2 stops
ONT6:11 pmOntario
$402

American Airlines flights from Ontario to Harlingen

Our best American Airlines deals on Ontario to Harlingen flight tickets
American Airlines
May 24
ONT11:59 pmOntario
8h 14m
1 stop
HRL10:13 amHarlingen Valley Intl
May 28
HRL8:04 pmHarlingen Valley Intl
5h 55m
1 stop
ONT11:59 pmOntario
$328
American Airlines
May 24
ONT1:10 pmOntario
9h 04m
2 stops
HRL12:14 amHarlingen Valley Intl
May 28
HRL8:04 pmHarlingen Valley Intl
5h 55m
1 stop
ONT11:59 pmOntario
$359
American Airlines
May 24
ONT1:10 pmOntario
9h 04m
2 stops
HRL12:14 amHarlingen Valley Intl
May 28
HRL10:43 amHarlingen Valley Intl
9h 39m
2 stops
ONT6:22 pmOntario
$413

momondo 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, momondo users made 832,500 searches. Data last updated May 13, 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
Quickest round-trip

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Sun 5/24

11:59 pm-10:13 am

1 stop8h 14m

Harlingen Valley Intl

Thu 5/28

8:04 pm-11:59 pm

1 stop5h 55m

$328

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Wed 9/9

5:45 am-3:34 pm

1 stop7h 49m

Harlingen Valley Intl

Thu 9/10

5:16 pm-9:59 pm

1 stop6h 43m

$347

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Sun 5/24

1:10 pm-12:14 am

2 stops9h 04m

Harlingen Valley Intl

Thu 5/28

8:04 pm-11:59 pm

1 stop5h 55m

$359

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Tue 9/22

5:45 am-3:34 pm

1 stop7h 49m

Harlingen Valley Intl

Wed 9/23

5:16 pm-9:59 pm

1 stop6h 43m

$397

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Wed 9/9

5:45 am-3:34 pm

1 stop7h 49m

Harlingen Valley Intl

Wed 9/16

7:27 am-6:11 pm

2 stops12h 44m

$402

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Thu 10/1

6:00 am-3:58 pm

1 stop7h 58m

Harlingen Valley Intl

Mon 10/5

5:18 pm-9:58 pm

1 stop6h 40m

$403

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Wed 9/9

5:45 am-3:34 pm

1 stop7h 49m

Harlingen Valley Intl

Thu 9/10

5:15 am-12:12 pm

2 stops8h 57m

$408

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Wed 9/9

5:00 am-9:44 pm

2 stops14h 44m

Harlingen Valley Intl

Sat 9/12

5:16 pm-9:59 pm

1 stop6h 43m

$411

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Sun 5/24

1:10 pm-12:14 am

2 stops9h 04m

Harlingen Valley Intl

Thu 5/28

10:43 am-6:22 pm

2 stops9h 39m

$413

OntarioHarlingen

ONT - HRL

ONTHRL

Ontario

Tue 9/22

5:45 am-3:34 pm

1 stop7h 49m

Harlingen Valley Intl

Wed 9/23

5:15 am-8:04 pm

2 stops16h 49m

$425

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Harlingen from

How to get the cheapest flight ticket from Ontario to Harlingen

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Harlingen?

If you aren’t able to travel during the month of October, then book flights to Harlingen from Ontario during April instead. Flights to Harlingen in April, while not as cheap as those in October, still average around $0.

Can stopping save me money on Ontario to Harlingen flights?

You could potentially save up to 44% on your flight if you consider stops on a Ontario to Harlingen flight.

When to book flights from Ontario to Harlingen

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Harlingen according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Harlingen (ONT to HRL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Harlingen

Fastest flight time

7h 49m

Direct flights

None
The fastest flight from Ontario to Harlingen takes 7h 49m
There are no direct flights from Ontario to Harlingen. There are no popular flight routes from Ontario to Harlingen.
Search flight deals

Frequently asked questions about flying from Ontario to Harlingen

  • How far is Ontario to Harlingen Valley Intl by plane?

    The straight-line distance from Ontario to Harlingen Valley Intl is 1306.7 mi. By plane, this route typically takes 7h 49m.

  • When did momondo last update prices for flights from Ontario Airport to Harlingen Valley Intl Airport?

    Prices for flights from Ontario Airport to Harlingen Valley Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Harlingen Valley Intl Airport?

  • How old do you have to be to fly from Ontario Airport to Harlingen Valley Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Harlingen Valley Intl Airport.

  • What documentation or ID do you need to fly to Harlingen Valley Intl Airport?

    The necessary travel and health documents for your Harlingen Valley Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Harlingen?

Best airlines flying from Ontario to Harlingen

Compare and see reviews for airlines that fly from Ontario to Harlingen with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $250Free CancellationRating
7.9
4,296 reviews
Search Southwest flights
American AirlinesPriceFrom $256Free CancellationRating
7.1
11,662 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Harlingen?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Harlingen from Ontario.

Can I find flights from Ontario to Harlingen with flexible booking policies on momondo?

momondo does allow users to show only those flights to Harlingen from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Harlingen?

Once you have performed a search for Ontario to Harlingen flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to Harlingen right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Ontario to Harlingen now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Harlingen and let you know when they change.

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