$168 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 4/11. 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$211
Peoria
Peoria2 stops$807
Chicago
Chicago1 stop$211
Peoria
Peoria2 stops$807

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

Tue, Apr 21 - Tue, Apr 28
Southwest Logo
7:10 am - 1:15 pm
HRL
-
ORD
6h 05m
1 stop
Southwest Logo
3:45 pm - 8:55 pm
ORD
-
HRL
5h 10m
1 stop
$211Southwest
Wed, Apr 15 - Sun, Apr 19
Southwest Logo
7:10 am - 1:15 pm
HRL
-
ORD
6h 05m
1 stop
Southwest Logo
3:45 pm - 11:00 pm
ORD
-
HRL
7h 15m
1 stop
$250Southwest
Thu, Feb 26 - Tue, Mar 3
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
ORD
4h 49m
1 stop
American Airlines Logo
10:49 am - 6:16 pm
ORD
-
HRL
7h 27m
1 stop
$270American Airlines
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
7:10 am - 1:15 pm
HRL
-
ORD
6h 05m
1 stop
Southwest Logo
11:55 am - 10:00 pm
ORD
-
HRL
10h 05m
2 stops
$278Southwest
Thu, Feb 26 - Thu, Mar 5
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
ORD
4h 49m
1 stop
American Airlines Logo
5:00 am - 10:12 am
ORD
-
HRL
5h 12m
1 stop
$289American Airlines
Wed, Apr 15 - Sun, Apr 19
Southwest Logo
7:10 am - 1:15 pm
HRL
-
ORD
6h 05m
1 stop
Southwest Logo
3:45 pm - 11:50 pm
ORD
-
HRL
8h 05m
2 stops
$295Southwest
Fri, Feb 13 - Fri, Feb 20
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
ORD
4h 49m
1 stop
American Airlines Logo
5:00 am - 10:12 am
ORD
-
HRL
5h 12m
1 stop
$299American Airlines
Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
5:25 pm - 11:59 pm
HRL
-
ORD
6h 34m
1 stop
United Airlines Logo
4:00 pm - 9:56 pm
ORD
-
HRL
5h 56m
1 stop
$303United Airlines
Fri, Feb 27 - Fri, Mar 6
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
ORD
4h 49m
1 stop
American Airlines Logo
5:00 am - 10:12 am
ORD
-
HRL
5h 12m
1 stop
$309American Airlines
Thu, Mar 5 - Mon, Mar 9
Southwest Logo
6:50 am - 2:20 pm
HRL
-
ORD
7h 30m
1 stop
Southwest Logo
4:15 pm - 12:05 am
ORD
-
HRL
7h 50m
2 stops
$334Southwest
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 January and June, when the average cost of round-trip tickets is $514 and $442 respectively.

Good to know

Low seasonJanuary
Cheapest flight$168
Best time to beat the crowds but there is an average 56% increase in price.
Most popular time to fly with an average 1% 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 afternoon, when round-trip flights cost $676 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 4273 reviews
8.0Comfort
8.6Crew
8.1Boarding
7.0Food
7.5Entertainment
Airline reviews

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

10.0 ExcellentAnonymous, Jan 2026
PHX - MDW
Read more Southwest reviews

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

Great vacation. Can't wait till next year for another one.

The seats were comfortable, and the boarding process was pretty smooth.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

Check-in, Boarding and flight were smooth. All the employees and crew was very nice and funny. They gave the kids crayons and workbooks to keep them occupied which was a big win. I’ve flown Southwest many times and that’s the first time I’ve seen that and it is a great addition.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

It was rough. The staff was unprofessional, the choice of on board drinks terrible, it was cramped in space at every airport, they always ran out of overhead bin space so they pressured people to check bags for free or we couldn’t leave on the plane— so I did check my bag to help, and they nearly lost my bag. My bag did not arrive on the luggage belt, another man on my flight and I had to waste our time going to the baggage office to search for our bags. I would only fly southwest again if it was my last choice. Also, my flights were consistently delayed over and over again— at one point they straight up told us we were waiting for the pilot to arrive.

Had to get off plane from prior flight even though I had to reboard same plane to continue to my final destination.

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

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Update to handle the delay was very bad, crews no smiles or welcome or thanks. Don’t care attitude

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

Little warm on the plane and delayed for an hour

So excited very proud first of all I wanna thank kayak all updates very professional and fast alart And amazing cabin crew so nice to me they deserve big salute

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

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.

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

Information on your arrival and departure airports