$140 Find Cheap Flights from Harlingen to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Harlingen to Illinois departing on 12/23. 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 Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harlingen to Illinois, 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 Harlingen to Illinois, as well as popular online travel agencies
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Cheap Flights from Harlingen to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$251
Peoria
Peoria2 stops$454
Chicago
Chicago1 stop$251
Peoria
Peoria2 stops$454

Book Cheap Harlingen to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Harlingen to Illinois 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 Harlingen to Illinois

Wed, Dec 3 - Wed, Dec 10
American Airlines Logo
6:10 pm - 11:35 pmHRL-ORD
5h 25m1 stop
American Airlines Logo
7:15 am - 3:30 pmORD-HRL
8h 15m1 stop
$251American Airlines
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Thu, Dec 25 - Thu, Jan 1
Multiple Airlines Logo
11:49 am - 4:42 pmHRL-ORD
28h 53m1 stop
Multiple Airlines Logo
6:14 pm - 10:53 amORD-HRL
16h 39m1 stop
$274Multiple Airlines
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Wed, Dec 3 - Wed, Dec 10
American Airlines Logo
6:10 pm - 11:35 pmHRL-ORD
5h 25m1 stop
American Airlines Logo
8:11 am - 3:30 pmORD-HRL
7h 19m1 stop
$275American Airlines
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Fri, Dec 26 - Tue, Dec 30
Sun Country Air Logo
12:37 pm - 6:44 pmHRL-ORD
6h 07m1 stop
Sun Country Air Logo
6:44 pm - 10:53 amORD-HRL
16h 09m1 stop
$315Sun Country Air
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Tue, Feb 24 - Wed, Feb 25
American Airlines Logo
2:46 pm - 10:26 pmHRL-ORD
7h 40m1 stop
American Airlines Logo
2:55 pm - 10:51 pmORD-HRL
7h 56m1 stop
$331American Airlines
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Wed, Nov 12 - Sun, Nov 16
United Airlines Logo
12:10 pm - 7:56 pmHRL-ORD
7h 46m1 stop
United Airlines Logo
6:00 am - 10:59 amORD-HRL
4h 59m1 stop
$339United Airlines
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Thu, Nov 13 - Mon, Nov 17
United Airlines Logo
5:00 pm - 12:15 amHRL-ORD
7h 15m1 stop
United Airlines Logo
2:21 pm - 9:54 pmORD-HRL
7h 33m1 stop
$359United Airlines
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Mon, Dec 22 - Fri, Jan 2
Sun Country Air Logo
11:43 am - 10:26 amHRL-ORD
22h 43m1 stop
Sun Country Air Logo
11:51 am - 10:02 amORD-HRL
22h 11m1 stop
$385Sun Country Air
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Thu, Nov 13 - Mon, Nov 17
Southwest Logo
5:45 am - 1:00 pmHRL-ORD
7h 15m2 stops
Southwest Logo
2:15 pm - 9:55 pmORD-HRL
7h 40m2 stops
$429Southwest
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Mon, Dec 22 - Fri, Jan 2
Southwest Logo
5:50 am - 1:00 pmHRL-ORD
7h 10m2 stops
Southwest Logo
3:05 pm - 11:55 pmORD-HRL
8h 50m2 stops
$449Southwest
Find Deal
Booking Insights

KAYAK's insights & trends for Harlingen to Illinois flights

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

What is the cheapest Harlingen to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Harlingen found in the last 72 hours was to Chicago, at $676 round-trip. The most popular route is from Harlingen (HRL) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $676.

What is the cheapest month to fly from Harlingen to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Harlingen to Illinois, 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 Harlingen to Illinois is May, when tickets cost $257 (return) on average. On the other hand, the most expensive months are June and February, when the average cost of round-trip tickets is $442 and $372 respectively.

What’s the cheapest day of the week to fly from Harlingen to Illinois?

The average price of all round-trip flights from Harlingen to Illinois clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Harlingen to Illinois, look for departures on Tuesdays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from Illinois, Tuesday is the cheapest day to fly and Monday is the most expensive.

Good to know

Low seasonFebruary
Cheapest flight$140
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly with an average 10% increase in price.
Flight from Harlingen to Chicago O'Hare Airport

FAQs - booking Illinois flights

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

    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 Harlingen to Illinois.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Harlingen to Illinois 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 Harlingen to Illinois?

    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 from Harlingen to Illinois with an airline and back with another airline.

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

    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 from Harlingen to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $351 on average. Morning departures are around 6% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $676.

Reviews of the top 3 airlines serving from Harlingen to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Harlingen to Illinois. 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 Harlingen to Illinois? 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 4241 reviews
8.6Crew
8.1Boarding
8.0Comfort
7.5Entertainment
7.0Food
Airline reviews

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

2.0 MediocreThomas, Oct 2025SAT - STL
Read more Southwest reviews

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

Excellent. Would encourage Southwest to keep current boarding procedures with free style seating. Makes for a fantastic experience

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

Worst experience I had on Southwest. Still better than most, but the seating was barely tolerable.

It was okay. The plane was delayed from earlier in the day, but they kept updating the departure time, sometimes later, sometimes earlier. That was stressful. Once we finally got on and took off, it was fine. I was supposed to have a connection in Chicago to Los Angeles, and the time for so late I was rebooked to arrive in LA 3 hours late. The departure time to Chicago later became early enough to have taken my original connection and arrive earlier but that wasn't an option.

Everything was on time. I was disappointed by the front section female, African American flight attendant. I did not see her name tag or would have identified by name not race. As passengers moved to the bathroom early in flight, she would say with a disdainful tone “I have to say the seat belt light is on” then go back to her book. Better trained flight attendants say something like be careful the seat belt light is on.

Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.

Bring back peanuts Take our drink orders when were all seated, especially after you switch to assigned seating.

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

Excellent experience. Starting with the agent at the Premier bag drop who noticed I was very early for my scheduled flight and offered to rebook me on an earlier flight with my seat preference. She would not let me leave the counter until she knew that all of the changes and new boarding pass showed up on my United app. At the gate, the flight boarded quickly such that we departed early and the flight was smooth. We arrived 20 minutes early at ORD and I was able to be home in time for dinner. One of the best flights I've had.

Salina to travers city was great! But the sept 24 Tranverse city was not! Traverse city to chichago was cancelled, i went to Denver & got to Salina 6 hours later!

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

This was the best 2 flights I have had with American out of SGF. Great crew both flights.

Excellent - explanations were clear staff was nice and flight was comfortable

Lost bag and 2 days no word leaving for cruise no clothes or stuff

Any flight to ORD after about 2pm this summer has been challenging. Flight was delayed getting in (coming from ORD) and that led to it not leaving before a ground stop due to lightening before they could fuel the plane, and so forth. They made up some time but we were still late in arriving at ORD, and that led to missed connections.

Food was ok, but not as good as I have had before on AA.

Pretty good. The food was just mediocre, the boarding and crew were good.

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

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