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

As of April 2026, 513 flights take off from Houston and land in Illinois each week. The most common flight departure day for this route is Thu, with 18% of weekly flights taking off on this day.

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

Southwest, United Airlines, and Delta are the most popular carriers operating from Houston to Illinois

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 27% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 6 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 April 2026, there are 73 flights per day flying from Houston to Illinois. The most common time of day flights depart is 11:00AM, with 41% of flights taking off at noon.

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 April 2026, there are 6 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.

$59 Cheap Flights from Houston to Illinois in 2026

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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.

12:27 pm - 3:17 pm

IAH

ORD

2h 50mnonstop

6:16 pm - 9:10 pm

ORD

IAH

2h 54mnonstop

$99Multiple Airlines

Tue, Apr 21 - Fri, Apr 24

12:35 pm - 9:12 pm

IAH

ORD

8h 37m

1 stop

8:25 am - 11:32 am

ORD

IAH

3h 07mnonstop

$100Multiple Airlines

Sat, Apr 25 - Wed, Apr 29

2:29 pm - 5:11 pm

IAH

ORD

2h 42mnonstop

6:16 pm - 9:10 pm

ORD

IAH

2h 54mnonstop

$102Spirit Airlines

Wed, Apr 22 - Sun, Apr 26

8:12 pm - 11:01 pm

IAH

ORD

2h 49mnonstop

4:05 pm - 7:17 pm

ORD

IAH

3h 12mnonstop

$103Frontier

Wed, May 20 - Sat, May 23

9:23 am - 12:13 pm

IAH

ORD

2h 50mnonstop

4:28 pm - 10:50 pm

ORD

IAH

6h 22m

1 stop

$104Frontier

Thu, Apr 30 - Mon, May 4

7:15 am - 9:54 am

IAH

ORD

2h 39mnonstop

4:50 pm - 7:44 pm

ORD

IAH

2h 54mnonstop

$108Spirit Airlines

Wed, Jun 3 - Sat, Jun 6

5:04 am - 9:59 am

IAH

MLI

4h 55m

1 stop

6:30 am - 1:30 pm

MLI

IAH

7h 00m

1 stop

$243United Airlines

Wed, May 27 - Sat, May 30

10:37 am - 6:26 pm

IAH

MLI

7h 49m

2 stops

4:24 pm - 10:28 pm

MLI

IAH

6h 04m

1 stop

$248American Airlines

Wed, May 27 - Sat, May 30

10:37 am - 6:26 pm

IAH

MLI

7h 49m

2 stops

11:07 am - 7:47 pm

MLI

IAH

8h 40m

2 stops

$253American Airlines

Wed, May 27 - Sat, May 30

5:04 am - 10:10 am

IAH

PIA

5h 06m

1 stop

5:33 pm - 12:15 am

PIA

IAH

6h 42m

1 stop

$277United Airlines

Sat, Jun 6 - Wed, Jun 10

Spirit Airlines flights from Houston to Illinois

Our best Spirit Airlines deals on Houston to Illinois flight tickets

Spirit Airlines

Apr 22

IAH2:29 pmHouston George Bush Intcntl

2h 42m

ORD5:11 pmChicago O'Hare Intl

Apr 26

ORD6:16 pmChicago O'Hare Intl

2h 54m

IAH9:10 pmHouston George Bush Intcntl

$102

Spirit Airlines

Jun 3

IAH7:15 amHouston George Bush Intcntl

2h 39m

ORD9:54 amChicago O'Hare Intl

Jun 6

ORD4:50 pmChicago O'Hare Intl

2h 54m

IAH7:44 pmHouston George Bush Intcntl

$108

Spirit Airlines

Jun 30

IAH10:39 amHouston George Bush Intcntl

2h 47m

ORD1:26 pmChicago O'Hare Intl

Jul 23

ORD2:21 pmChicago O'Hare Intl

2h 51m

IAH5:12 pmHouston George Bush Intcntl

$120

Frontier flights from Houston to Illinois

Our best Frontier deals on Houston to Illinois flight tickets

Frontier

Apr 16

IAH9:23 amHouston George Bush Intcntl

2h 50m

ORD12:13 pmChicago O'Hare Intl

Apr 23

ORD5:20 amChicago O'Hare Intl

3h 07m

IAH8:27 amHouston George Bush Intcntl

$103

Frontier

Apr 30

IAH9:23 amHouston George Bush Intcntl

2h 50m

ORD12:13 pmChicago O'Hare Intl

May 4

ORD4:28 pmChicago O'Hare Intl

6h 22m

1 stop

IAH10:50 pmHouston George Bush Intcntl

$104

Frontier

Jun 27

IAH9:52 pmHouston George Bush Intcntl

2h 50m

ORD12:42 amChicago O'Hare Intl

Jul 22

ORD5:29 pmChicago O'Hare Intl

3h 28m

IAH8:57 pmHouston George Bush Intcntl

$106

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Tue 4/21

12:27 pm-3:17 pm

Nonstop2h 50m

Chicago O'Hare Intl

Fri 4/24

6:16 pm-9:10 pm

Nonstop2h 54m

$99

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Sat 4/25

12:35 pm-9:12 pm

1 stop8h 37m

Chicago O'Hare Intl

Wed 4/29

8:25 am-11:32 am

Nonstop3h 07m

$100

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Wed 4/22

2:29 pm-5:11 pm

Nonstop2h 42m

Chicago O'Hare Intl

Sun 4/26

6:16 pm-9:10 pm

Nonstop2h 54m

$102

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Wed 5/20

8:12 pm-11:01 pm

Nonstop2h 49m

Chicago O'Hare Intl

Sat 5/23

4:05 pm-7:17 pm

Nonstop3h 12m

$103

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Thu 4/30

9:23 am-12:13 pm

Nonstop2h 50m

Chicago O'Hare Intl

Mon 5/4

4:28 pm-10:50 pm

1 stop6h 22m

$104

Quickest round-trip

HoustonChicago

IAH - ORD

IAHORD

Houston George Bush Intcntl

Wed 6/3

7:15 am-9:54 am

Nonstop2h 39m

Chicago O'Hare Intl

Sat 6/6

4:50 pm-7:44 pm

Nonstop2h 54m

$108

HoustonMoline

IAH - MLI

IAHMLI

Houston George Bush Intcntl

Wed 5/27

5:04 am-9:59 am

1 stop4h 55m

Moline Quad-City

Sat 5/30

6:30 am-1:30 pm

1 stop7h 00m

$243

HoustonMoline

IAH - MLI

IAHMLI

Houston George Bush Intcntl

Wed 5/27

10:37 am-6:26 pm

2 stops7h 49m

Moline Quad-City

Sat 5/30

4:24 pm-10:28 pm

1 stop6h 04m

$248

HoustonMoline

IAH - MLI

IAHMLI

Houston George Bush Intcntl

Wed 5/27

10:37 am-6:26 pm

2 stops7h 49m

Moline Quad-City

Sat 5/30

11:07 am-7:47 pm

2 stops8h 40m

$253

HoustonPeoria

IAH - PIA

IAHPIA

Houston George Bush Intcntl

Sat 6/6

5:04 am-10:10 am

1 stop5h 06m

Greater Peoria

Wed 6/10

5:33 pm-12:15 am

1 stop6h 42m

$277

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 January. Flight prices, which tend to average around $166, 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 January, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $178.

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

The cheapest day to depart from Houston to Illinois is on a Wednesday when prices can be found for as low as $267. Flights from Houston to Illinois on a Sunday will generally be more expensive and average around $382. 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 $219. Flights at noon are often more expensive with an average ticket price of $666.

What is the cheapest Houston to Illinois flight route?

Fly from Houston George Bush Intcntl to Chicago O'Hare Intl for the best Houston - Illinois flight prices

How far in advance should I book a flight 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 $218 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 $152 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 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 April 2026, there are 6 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 $64	Free Cancellation	Rating 5.7 2,997 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $71	Free Cancellation	Rating 6.3 8,605 reviews	Search Spirit Airlines flights
United Airlines	PriceFrom $148	Free Cancellation	Rating 7.4 9,559 reviews	Search United Airlines flights
Southwest	PriceFrom $162	Free Cancellation	Rating 8.0 4,337 reviews	Search Southwest flights
American Airlines	PriceFrom $166	Free Cancellation	Rating 7.1 11,562 reviews	Search American Airlines flights
Delta	PriceFrom $216	Free Cancellation	Rating 7.9 8,394 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.