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Cheap flights from Illinois to Harlingen from $135

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Harlingen departing on 11/15. 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 Illinois to Harlingen

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:04 pm - 11:21 pmSTL-HRL
6h 17m1 stop
American Airlines Logo
6:43 pm - 10:59 pmHRL-STL
4h 16m1 stop
$233American Airlines
Find Deal
Wed, Jan 21 - Tue, Jan 27
American Airlines Logo
6:00 am - 2:46 pmSTL-HRL
8h 46m2 stops
American Airlines Logo
6:43 pm - 10:59 pmHRL-STL
4h 16m1 stop
$238American Airlines
Find Deal
Wed, Jan 21 - Tue, Jan 27
Southwest Logo
5:30 am - 1:45 pmSTL-HRL
8h 15m1 stop
Southwest Logo
8:15 pm - 12:05 amHRL-STL
3h 50m1 stop
$304Southwest
Find Deal
Fri, Oct 17 - Sun, Oct 19
Delta Logo
8:50 am - 2:43 pmORD-HRL
5h 53m1 stop
Delta Logo
4:05 pm - 9:40 pmHRL-ORD
5h 35m1 stop
$310Delta
Find Deal
Wed, Nov 26 - Sat, Dec 6
Delta Logo
8:50 am - 2:29 pmSTL-HRL
5h 39m1 stop
Delta Logo
3:00 pm - 11:10 pmHRL-STL
8h 10m1 stop
$314Delta
Find Deal
Tue, Mar 24 - Wed, Mar 25
Southwest Logo
4:20 pm - 9:40 pmORD-HRL
5h 20m1 stop
Southwest Logo
10:45 am - 9:30 pmHRL-ORD
10h 45m1 stop
$324Southwest
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Tue, Oct 14 - Mon, Oct 20
Sun Country Air Logo
8:10 pm - 9:09 amORD-HRL
12h 59m1 stop
Sun Country Air Logo
10:19 am - 11:07 amHRL-ORD
24h 48m1 stop
$385Sun Country Air
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Thu, Mar 26 - Sun, Mar 29
United Airlines Logo
5:07 pm - 11:18 pmORD-HRL
6h 11m1 stop
United Airlines Logo
5:00 am - 10:10 amHRL-ORD
5h 10m1 stop
$393United Airlines
Find Deal
Wed, Oct 15 - Sun, Oct 19
United Airlines Logo
2:20 pm - 7:41 pmORD-HRL
5h 21m1 stop
United Airlines Logo
5:00 am - 11:05 amHRL-ORD
6h 05m1 stop
$395United Airlines
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Sat, Oct 18 - Sat, Oct 25
Sun Country Air Logo
11:45 am - 10:53 amORD-HRL
23h 08m1 stop
Sun Country Air Logo
11:49 am - 6:50 pmHRL-ORD
7h 01m1 stop
$402Sun Country Air
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Wed, Dec 31 - Sun, Jan 4

American Airlines flights from Illinois to Harlingen, Texas

Our best American Airlines deals on Illinois to Harlingen, Texas flight tickets
American Airlines
Jan 21
STL5:04 pmLambert-St Louis
6h 17m
1 stop
HRL11:21 pmHarlingen Valley Intl
Jan 27
HRL6:43 pmHarlingen Valley Intl
4h 16m
1 stop
STL10:59 pmLambert-St Louis
$233
Find similar
American Airlines
Jan 21
STL6:00 amLambert-St Louis
8h 46m
2 stops
HRL2:46 pmHarlingen Valley Intl
Jan 27
HRL6:43 pmHarlingen Valley Intl
4h 16m
1 stop
STL10:59 pmLambert-St Louis
$238
Find similar
American Airlines
Jan 21
STL6:00 amLambert-St Louis
8h 46m
2 stops
HRL2:46 pmHarlingen Valley Intl
Jan 27
HRL6:02 amHarlingen Valley Intl
12h 14m
2 stops
STL6:16 pmLambert-St Louis
$251
Find similar

Southwest flights from Illinois to Harlingen, Texas

Our best Southwest deals on Illinois to Harlingen, Texas flight tickets
Southwest
Oct 17
STL5:30 amLambert-St Louis
8h 15m
1 stop
HRL1:45 pmHarlingen Valley Intl
Oct 19
HRL8:15 pmHarlingen Valley Intl
3h 50m
1 stop
STL12:05 amLambert-St Louis
$304
Find similar
Southwest
Oct 14
ORD4:20 pmChicago O'Hare Intl
5h 20m
1 stop
HRL9:40 pmHarlingen Valley Intl
Oct 20
HRL10:45 amHarlingen Valley Intl
10h 45m
1 stop
ORD9:30 pmChicago O'Hare Intl
$324
Find similar
Southwest
Oct 7
STL5:40 pmLambert-St Louis
4h 00m
1 stop
HRL9:40 pmHarlingen Valley Intl
Oct 9
HRL9:45 amHarlingen Valley Intl
5h 00m
1 stop
STL2:45 pmLambert-St Louis
$345
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Harlingen, Texas 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 October 2, 2025.
Use the filters below to find and compare flights from Illinois to Harlingen, Texas that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 1/21

5:04 pm-11:21 pm

1 stop6h 17m

Harlingen Valley Intl

Tue 1/27

6:43 pm-10:59 pm

1 stop4h 16m

$233

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Wed 1/21

6:00 am-2:46 pm

2 stops8h 46m

Harlingen Valley Intl

Tue 1/27

6:43 pm-10:59 pm

1 stop4h 16m

$238

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Fri 10/17

5:30 am-1:45 pm

1 stop8h 15m

Harlingen Valley Intl

Sun 10/19

8:15 pm-12:05 am

1 stop3h 50m

$304

ChicagoHarlingen

ORD - HRL

ORDHRL

Chicago O'Hare Intl

Wed 11/26

8:50 am-2:43 pm

1 stop5h 53m

Harlingen Valley Intl

Sat 12/6

4:05 pm-9:40 pm

1 stop5h 35m

$310

St. LouisHarlingen

STL - HRL

STLHRL

Lambert-St Louis

Tue 3/24

8:50 am-2:29 pm

1 stop5h 39m

Harlingen Valley Intl

Wed 3/25

3:00 pm-11:10 pm

1 stop8h 10m

$314

ChicagoHarlingen

ORD - HRL

ORDHRL

Chicago O'Hare Intl

Tue 10/14

4:20 pm-9:40 pm

1 stop5h 20m

Harlingen Valley Intl

Mon 10/20

10:45 am-9:30 pm

1 stop10h 45m

$324

ChicagoHarlingen

ORD - HRL

ORDHRL

Chicago O'Hare Intl

Thu 3/26

8:10 pm-9:09 am

1 stop12h 59m

Harlingen Valley Intl

Sun 3/29

10:19 am-11:07 am

1 stop24h 48m

$385

ChicagoHarlingen

ORD - HRL

ORDHRL

Chicago O'Hare Intl

Wed 10/15

5:07 pm-11:18 pm

1 stop6h 11m

Harlingen Valley Intl

Sun 10/19

5:00 am-10:10 am

1 stop5h 10m

$393

ChicagoHarlingen

ORD - HRL

ORDHRL

Chicago O'Hare Intl

Sat 10/18

2:20 pm-7:41 pm

1 stop5h 21m

Harlingen Valley Intl

Sat 10/25

5:00 am-11:05 am

1 stop6h 05m

$395

ChicagoHarlingen

ORD - HRL

ORDHRL

Chicago O'Hare Intl

Wed 12/31

11:45 am-10:53 am

1 stop23h 08m

Harlingen Valley Intl

Sun 1/4

11:49 am-6:50 pm

1 stop7h 01m

$402

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Illinois to Harlingen, Texas

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, Texas?

The month of April is, on average, the cheapest month to fly to Harlingen, Texas from Illinois, with most prices found around $273. If you are unable to visit Harlingen, Texas during the month of April, then departing from Illinois during the month January is also very affordable. Most momondo users find prices during this month for around $316.

What is the cheapest day to depart on your flight to Harlingen, Texas?

The cheapest day to depart on your flight to Harlingen, Texas is on a Wednesday when prices can be found for as low as $295. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Harlingen, Texas for around $482.

What is the cheapest time of day to depart on your flight to Harlingen, Texas?

Our most recent data shows that the best time of day to fly to Harlingen, Texas is in the evening. Flights from Illinois to Harlingen, Texas during this time can be as low as $347. Flights in the morning are often more expensive with an average ticket price of $433.

What is the cheapest Illinois to Harlingen Valley Intl flight route?

Fly from Chicago O'Hare Intl to Harlingen Valley Intl for the best Illinois - Harlingen Valley Intl flight prices

What cabin class options are available on Illinois to Harlingen Valley Intl flights?

There is only 1 cabin class available to choose from on Illinois to Harlingen Valley Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Harlingen, Texas flights?

You could potentially save up to 52% on your flight if you consider stops on a Illinois to Harlingen, Texas flight.

Cheap Illinois to Harlingen, Texas flight deals and tips

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

Direct flights

None
There are no direct flights from Illinois to Harlingen, Texas. There are no popular flight routes from Illinois to Harlingen, Texas.
Search flight deals

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

    Prices for flights from Illinois to Harlingen Valley Intl Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Harlingen Valley Intl Airport.

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

    The travel and health documents required for your trip to Harlingen Valley Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Harlingen Valley Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Illinois to Harlingen, Texas?

Best airlines flying from Illinois to Harlingen, Texas

Compare and see reviews for airlines that fly from Illinois to Harlingen, Texas with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $208Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,933 reviews
Search United Airlines flights
American AirlinesPriceFrom $267Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Harlingen for you.

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

Yes. momondo enables you to select and highlight flights to Harlingen from Illinois with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Harlingen from Illinois.

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

If you are simply researching potential flights to Harlingen, momondo offers a useful price alert feature which will track prices for flights to Harlingen from Illinois and alert you when they change.

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