What airlines fly to Illinois?

United Airlines, Frontier and American Airlines are the top three most popular airlines that fly to Illinois from Houston according to our data. United Airlines is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

How many flights depart from Houston to Illinois on average per day?

As of June 2026, there are 91 flights per day flying from Houston to Illinois. The most common time of day flights depart is 11:00AM, with 45% of flights taking off at noon.

What is the cheapest airline that flies from Houston to Illinois?

Frontier, American Airlines, and Delta are the most popular carriers operating from Houston to Illinois

How many flights depart from Houston to Illinois on average per week?

As of June 2026, 637 flights take off from Houston and land in Illinois each week. The most common flight departure day for this route is Mon, with 18% of weekly flights taking off on this day.

When did momondo last update prices for flights from Houston to Illinois?

Prices for flights from Houston to Illinois are updated daily.

How many operators does momondo search for flights from Houston to Illinois?

As of June 2026, there are 5 operators available to choose from for flights from Houston to Illinois.

How old do you have to be to fly from Houston to Illinois?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Houston to Illinois.

What documentation or ID do you need to fly to Illinois?

The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$79 Cheap Flights from Houston to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Houston to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:52 pm - 12:42 am

IAH

ORD

2h 50mnonstop

5:29 pm - 8:57 pm

ORD

IAH

3h 28mnonstop

$134Frontier

Thu, Aug 27 - Mon, Aug 31

9:58 pm - 12:49 am

IAH

ORD

2h 51mnonstop

5:29 pm - 8:57 pm

ORD

IAH

3h 28mnonstop

$135Frontier

Tue, Jul 28 - Tue, Sep 1

11:00 am - 6:45 pm

HOU

ORD

7h 45m

1 stop

5:30 am - 1:24 pm

ORD

HOU

7h 54m

1 stop

$199Delta

Tue, Sep 29 - Wed, Sep 30

2:25 pm - 8:55 pm

HOU

ORD

6h 30m

1 stop

12:40 pm - 10:35 pm

ORD

HOU

9h 55m

2 stops

$204Delta

Tue, Sep 29 - Wed, Sep 30

2:35 pm - 5:00 pm

HOU

MDW

2h 25mnonstop

7:10 pm - 9:45 pm

MDW

HOU

2h 35mnonstop

$209Southwest

Tue, Jul 14 - Wed, Jul 15

10:40 pm - 1:05 am

HOU

MDW

2h 25mnonstop

10:10 am - 4:40 pm

MDW

HOU

6h 30m

1 stop

$214Southwest

Mon, Nov 23 - Tue, Dec 1

5:41 am - 11:02 am

HOU

MLI

5h 21m

1 stop

11:32 am - 5:44 pm

MLI

HOU

6h 12m

1 stop

$244American Airlines

Sat, Aug 8 - Sat, Aug 15

6:13 am - 10:58 am

IAH

MLI

4h 45m

1 stop

6:50 pm - 11:51 pm

MLI

IAH

5h 01m

1 stop

$246American Airlines

Sat, Jul 4 - Fri, Jul 10

8:30 pm - 10:45 pm

IAH

STL

2h 15mnonstop

11:10 am - 1:25 pm

STL

IAH

2h 15mnonstop

$284United Airlines

Wed, Jul 8 - Tue, Jul 21

5:06 pm - 11:14 pm

IAH

MLI

6h 08m

1 stop

8:13 am - 1:36 pm

MLI

IAH

5h 23m

1 stop

$323United Airlines

Sat, Aug 29 - Wed, Sep 2

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Frontier flights from Houston to Illinois

Our best Frontier deals on Houston to Illinois flight tickets

Frontier

Aug 27

IAH9:52 pmHouston George Bush Intcntl

2h 50m

ORD12:42 amChicago O'Hare Intl

Aug 31

ORD5:29 pmChicago O'Hare Intl

3h 28m

IAH8:57 pmHouston George Bush Intcntl

$134

Frontier

Jul 28

IAH9:58 pmHouston George Bush Intcntl

2h 51m

ORD12:49 amChicago O'Hare Intl

Sep 1

ORD5:29 pmChicago O'Hare Intl

3h 28m

IAH8:57 pmHouston George Bush Intcntl

$135

Frontier

Aug 13

IAH9:42 pmHouston George Bush Intcntl

2h 51m

ORD12:33 amChicago O'Hare Intl

Aug 15

ORD5:30 pmChicago O'Hare Intl

3h 17m

IAH8:47 pmHouston George Bush Intcntl

$136

Delta flights from Houston to Illinois

Our best Delta deals on Houston to Illinois flight tickets

Delta

Jul 28

HOU5:17 pmHouston Hobby

6h 36m

1 stop

ORD11:53 pmChicago O'Hare Intl

Aug 4

ORD6:40 amChicago O'Hare Intl

5h 36m

1 stop

HOU12:16 pmHouston Hobby

$229

Delta

Jul 28

HOU6:00 amHouston Hobby

10h 23m

2 stops

ORD4:23 pmChicago O'Hare Intl

Aug 4

ORD6:40 amChicago O'Hare Intl

5h 36m

1 stop

HOU12:16 pmHouston Hobby

$234

Delta

Aug 4

HOU10:50 amHouston Hobby

6h 01m

1 stop

ORD4:51 pmChicago O'Hare Intl

Aug 6

ORD5:30 amChicago O'Hare Intl

6h 46m

1 stop

HOU12:16 pmHouston Hobby

$237

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Thu 8/27

9:52 pm-12:42 am

Nonstop2h 50m

Chicago O'Hare Intl

Mon 8/31

5:29 pm-8:57 pm

Nonstop3h 28m

$134

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Tue 7/28

9:58 pm-12:49 am

Nonstop2h 51m

Chicago O'Hare Intl

Tue 9/1

5:29 pm-8:57 pm

Nonstop3h 28m

$135

HoustonChicago

HOU - ORD

HOUORD

Houston Hobby

Tue 9/29

11:00 am-6:45 pm

1 stop7h 45m

Chicago O'Hare Intl

Wed 9/30

5:30 am-1:24 pm

1 stop7h 54m

$199

HoustonChicago

HOU - ORD

HOUORD

Houston Hobby

Tue 9/29

2:25 pm-8:55 pm

1 stop6h 30m

Chicago O'Hare Intl

Wed 9/30

12:40 pm-10:35 pm

2 stops9h 55m

$204

HoustonChicago

HOU - MDW

HOUMDW

Houston Hobby

Tue 7/14

2:35 pm-5:00 pm

Nonstop2h 25m

Chicago Midway

Wed 7/15

7:10 pm-9:45 pm

Nonstop2h 35m

$209

HoustonChicago

HOU - MDW

HOUMDW

Houston Hobby

Mon 11/23

10:40 pm-1:05 am

Nonstop2h 25m

Chicago Midway

Tue 12/1

10:10 am-4:40 pm

1 stop6h 30m

$214

HoustonMoline

HOU - MLI

HOUMLI

Houston Hobby

Sat 8/8

5:41 am-11:02 am

1 stop5h 21m

Moline Quad-City

Sat 8/15

11:32 am-5:44 pm

1 stop6h 12m

$244

HoustonMoline

IAH - MLI

IAHMLI

Houston George Bush Intcntl

Sat 7/4

6:13 am-10:58 am

1 stop4h 45m

Moline Quad-City

Fri 7/10

6:50 pm-11:51 pm

1 stop5h 01m

$246

Quickest round-trip

HoustonSt. Louis

IAH - STL

IAHSTL

Houston George Bush Intcntl

Wed 7/8

8:30 pm-10:45 pm

Nonstop2h 15m

Lambert-St Louis

Tue 7/21

11:10 am-1:25 pm

Nonstop2h 15m

$284

HoustonMoline

IAH - MLI

IAHMLI

Houston George Bush Intcntl

Sat 8/29

5:06 pm-11:14 pm

1 stop6h 08m

Moline Quad-City

Wed 9/2

8:13 am-1:36 pm

1 stop5h 23m

$323

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Houston to Illinois

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

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Houston is in September. Flight prices, which tend to average around $173, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $215.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Houston to Illinois is on a Saturday when prices can be found for as low as $301. Flights from Houston to Illinois on a Monday will generally be more expensive and average around $417. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Houston to Illinois during this time can be as low as $234. Flights at noon are often more expensive with an average ticket price of $683.

What is the cheapest Houston to Illinois flight route?

Fly from Houston George Bush Intcntl to Chicago Midway for the best Houston - Illinois flight prices

How far in advance should I book a flight from Houston to Illinois?

You are more likely to see cheaper flights to Illinois from Houston when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $226 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Houston for as low as $139 on momondo.

What cabin class options are available on Houston to Illinois flights?

There are 4 cabin classes available to choose from on Houston to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Houston to Illinois flight deals and tips

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

Fastest flight time	2h 00m
Direct flights	Every day
Airports in Illinois	98 airports

The fastest flight from Houston to Illinois takes 2h 00m

Direct flights go from Houston to Illinois every day.

There are 98 airports in Illinois. From Houston there are direct flights to Chicago Midway (MDW), Lambert-St Louis (STL).

Search flight deals

Frequently asked questions about flying from Houston to Illinois

When did momondo last update prices for flights from Houston to Illinois?
Prices for flights from Houston to Illinois are updated daily.
How many operators does momondo search for flights from Houston to Illinois?
As of June 2026, there are 5 operators available to choose from for flights from Houston to Illinois.
How old do you have to be to fly from Houston to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Houston to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Houston to Illinois

Compare and see reviews for airlines that fly from Houston to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $59	Free Cancellation	Rating 5.6 2,881 reviews	Search Frontier flights
United Airlines	PriceFrom $157	Free Cancellation	Rating 7.4 9,845 reviews	Search United Airlines flights
Southwest	PriceFrom $167	Free Cancellation	Rating 7.9 4,235 reviews	Search Southwest flights
American Airlines	PriceFrom $172	Free Cancellation	Rating 7.1 11,670 reviews	Search American Airlines flights
Delta	PriceFrom $216	Free Cancellation	Rating 7.8 8,406 reviews	Search Delta flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Houston to Illinois. Millions of users trust and use momondo every year so you are in good hands.

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

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

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

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 Illinois from Houston.

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

Yes momondo offers price alerts on flights to Illinois from Houston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.