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

Frontier, Southwest, 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 August 2026, 576 flights take off from Houston and land in Illinois each week. The most common flight departure day for this route is Tue, with 17% of weekly flights taking off on this day.

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

As of August 2026, there are 82 flights per day flying from Houston to Illinois. The most common time of day flights depart is 11:00AM, with 42% of flights taking off at noon.

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 41% 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.

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 August 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

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.

6:08 am - 1:10 pmIAH Houston George Bush Intcntl-STL Lambert-St Louis

7h 02m1 stop Atlanta Hartsfield-Jackson

2:29 pm - 7:17 amSTL Lambert-St Louis-IAH Houston George Bush Intcntl

16h 48m1 stop Atlanta Hartsfield-Jackson

$120Frontier

Mon, Sep 14 - Mon, Sep 21

9:04 pm - 1:10 pmIAH Houston George Bush Intcntl-STL Lambert-St Louis

16h 06m1 stop Atlanta Hartsfield-Jackson

2:29 pm - 7:17 amSTL Lambert-St Louis-IAH Houston George Bush Intcntl

16h 48m1 stop Atlanta Hartsfield-Jackson

$126Frontier

Thu, Sep 17 - Mon, Sep 21

6:15 am - 1:45 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

7h 30m1 stop Fort Lauderdale

7:25 am - 10:30 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

3h 05mnonstop

$179Multiple Airlines

Sun, Sep 20 - Wed, Sep 23

6:15 am - 1:45 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

7h 30m1 stop Fort Lauderdale

7:25 am - 10:30 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

3h 05mnonstop

$179Multiple Airlines

Sun, Sep 13 - Wed, Sep 16

8:50 pm - 11:15 pmHOU Houston Hobby-MDW Chicago Midway

2h 25mnonstop

5:25 am - 7:50 amMDW Chicago Midway-HOU Houston Hobby

2h 25mnonstop

$185Southwest

Tue, Sep 22 - Thu, Sep 24

11:25 am - 3:30 pmHOU Houston Hobby-MDW Chicago Midway

4h 05m1 stop New Orleans Louis Armstrong

7:25 am - 9:55 amMDW Chicago Midway-HOU Houston Hobby

2h 30mnonstop

$191Southwest

Tue, Sep 22 - Thu, Sep 24

11:00 am - 6:45 pmHOU Houston Hobby-ORD Chicago O'Hare Intl

7h 45m1 stop Atlanta Hartsfield-Jackson

5:30 am - 1:18 pmORD Chicago O'Hare Intl-HOU Houston Hobby

7h 48m1 stop Atlanta Hartsfield-Jackson

$205Delta

Tue, Sep 29 - Wed, Sep 30

5:30 pm - 11:59 pmHOU Houston Hobby-ORD Chicago O'Hare Intl

6h 29m1 stop Atlanta Hartsfield-Jackson

3:49 pm - 11:13 pmORD Chicago O'Hare Intl-HOU Houston Hobby

7h 24m1 stop Atlanta Hartsfield-Jackson

$205Delta

Mon, Dec 7 - Tue, Dec 8

11:33 am - 2:22 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 49mnonstop

11:00 am - 1:51 pmORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 51mnonstop

$209American Airlines

Thu, Oct 8 - Mon, Oct 12

9:06 am - 11:58 amIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 52mnonstop

6:53 am - 9:40 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 47mnonstop

$209American Airlines

Tue, Sep 22 - Thu, Oct 1

Cheap last minute flights

Enter your travel dates to find the best prices.

12:53 pm - 3:59 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

3h 06mnonstop

7:25 am - 10:30 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

3h 05mnonstop

$196Frontier

Sat, Aug 22 - Tue, Sep 22

9:58 pm - 12:49 amIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 51mnonstop

7:25 am - 10:30 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

3h 05mnonstop

$199Frontier

Thu, Aug 20 - Tue, Sep 22

10:30 am - 1:00 pmHOU Houston Hobby-MDW Chicago Midway

2h 30mnonstop

7:50 am - 1:55 pmMDW Chicago Midway-HOU Houston Hobby

6h 05m1 stop Louisville Intl

$331Southwest

Sat, Aug 22 - Sat, Sep 19

3:15 pm - 5:40 pmHOU Houston Hobby-MDW Chicago Midway

2h 25mnonstop

1:45 pm - 4:15 pmMDW Chicago Midway-HOU Houston Hobby

2h 30mnonstop

$333Southwest

Sat, Aug 22 - Sat, Sep 19

10:50 am - 4:51 pmHOU Houston Hobby-ORD Chicago O'Hare Intl

6h 01m1 stop Atlanta Hartsfield-Jackson

3:40 pm - 10:39 pmORD Chicago O'Hare Intl-HOU Houston Hobby

6h 59m1 stop Atlanta Hartsfield-Jackson

$341Delta

Sat, Aug 22 - Sat, Sep 19

5:20 am - 12:39 pmIAH Houston George Bush Intcntl-MDW Chicago Midway

7h 19m1 stop Detroit Metropolitan Wayne County

2:00 pm - 9:30 pmMDW Chicago Midway-IAH Houston George Bush Intcntl

7h 30m1 stop Minneapolis St Paul

$341Delta

Sat, Aug 22 - Sat, Sep 19

11:24 am - 6:17 pmIAH Houston George Bush Intcntl-PIA Greater Peoria

6h 53m1 stop Chicago O'Hare Intl

12:20 pm - 6:04 pmPIA Greater Peoria-IAH Houston George Bush Intcntl

5h 44m1 stop Dallas/Fort Worth

$381American Airlines

Sat, Aug 22 - Tue, Aug 25

6:37 pm - 11:59 pmIAH Houston George Bush Intcntl-PIA Greater Peoria

5h 22m1 stop Chicago O'Hare Intl

6:00 am - 12:26 pmPIA Greater Peoria-IAH Houston George Bush Intcntl

6h 26m1 stop Chicago O'Hare Intl

$381American Airlines

Sat, Aug 22 - Wed, Aug 26

5:06 pm - 8:05 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 59mnonstop

6:29 pm - 9:20 pmORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 51mnonstop

$457United Airlines

Wed, Aug 19 - Wed, Aug 26

5:00 am - 10:06 amIAH Houston George Bush Intcntl-PIA Greater Peoria

5h 06m1 stop Chicago O'Hare Intl

3:35 pm - 8:47 pmPIA Greater Peoria-IAH Houston George Bush Intcntl

5h 12m1 stop Chicago O'Hare Intl

$490United Airlines

Thu, Aug 20 - Sat, Aug 22

Cheap direct flights

Enter your travel dates to find the best prices.

11:25 am - 2:17 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 52mnonstop

7:40 am - 10:39 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 59mnonstop

$146Frontier

Tue, Oct 6 - Thu, Oct 8

11:36 am - 2:25 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 49mnonstop

7:40 am - 10:39 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 59mnonstop

$146Frontier

Fri, Oct 23 - Mon, Oct 26

11:36 am - 2:25 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 49mnonstop

7:40 am - 10:39 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 59mnonstop

$146Frontier

Fri, Oct 16 - Mon, Oct 19

8:50 pm - 11:15 pmHOU Houston Hobby-MDW Chicago Midway

2h 25mnonstop

5:25 am - 7:50 amMDW Chicago Midway-HOU Houston Hobby

2h 25mnonstop

$185Southwest

Tue, Sep 22 - Thu, Sep 24

7:55 pm - 10:20 pmHOU Houston Hobby-MDW Chicago Midway

2h 25mnonstop

5:25 am - 7:50 amMDW Chicago Midway-HOU Houston Hobby

2h 25mnonstop

$204Southwest

Fri, Sep 11 - Fri, Sep 18

5:00 am - 7:55 amIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 55mnonstop

6:29 pm - 9:20 pmORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 51mnonstop

$209United Airlines

Thu, Oct 1 - Thu, Oct 1

9:45 pm - 12:23 amIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 38mnonstop

9:38 pm - 12:30 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 52mnonstop

$209United Airlines

Mon, Sep 28 - Mon, Oct 5

11:33 am - 2:22 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 49mnonstop

11:00 am - 1:51 pmORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 51mnonstop

$209American Airlines

Thu, Oct 8 - Mon, Oct 12

9:06 am - 11:58 amIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 52mnonstop

6:53 am - 9:40 amORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 47mnonstop

$209American Airlines

Tue, Sep 22 - Thu, Oct 1

11:00 am - 1:54 pmIAH Houston George Bush Intcntl-ORD Chicago O'Hare Intl

2h 54mnonstop

9:16 pm - 11:59 pmORD Chicago O'Hare Intl-IAH Houston George Bush Intcntl

2h 43mnonstop

$210Alaska Airlines

Thu, Sep 10 - Mon, Sep 14

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Frontier flights from Houston to Illinois

Our best Frontier deals on Houston to Illinois flight tickets

Frontier

Sep 14

IAH6:08 amHouston George Bush Intcntl

7h 02m

1 stop

STL1:10 pmLambert-St Louis

Sep 21

STL2:29 pmLambert-St Louis

16h 48m

1 stop

IAH7:17 amHouston George Bush Intcntl

$120

Frontier

Sep 17

IAH9:04 pmHouston George Bush Intcntl

16h 06m

1 stop

STL1:10 pmLambert-St Louis

Sep 21

STL2:29 pmLambert-St Louis

16h 48m

1 stop

IAH7:17 amHouston George Bush Intcntl

$126

Frontier

Sep 29

IAH9:04 pmHouston George Bush Intcntl

16h 06m

1 stop

STL1:10 pmLambert-St Louis

Oct 28

STL10:35 amLambert-St Louis

11h 35m

1 stop

IAH10:10 pmHouston George Bush Intcntl

$136

Delta flights from Houston to Illinois

Our best Delta deals on Houston to Illinois flight tickets

Delta

Sep 9

HOU2:25 pmHouston Hobby

6h 31m

1 stop

ORD8:56 pmChicago O'Hare Intl

Sep 29

ORD8:05 amChicago O'Hare Intl

5h 13m

1 stop

HOU1:18 pmHouston Hobby

$205

Delta

Sep 9

HOU5:26 pmHouston Hobby

6h 33m

1 stop

ORD11:59 pmChicago O'Hare Intl

Sep 29

ORD1:55 pmChicago O'Hare Intl

8h 44m

2 stops

HOU10:39 pmHouston Hobby

$210

Delta

Sep 29

HOU6:00 amHouston Hobby

10h 13m

2 stops

ORD4:13 pmChicago O'Hare Intl

Sep 30

ORD11:17 amChicago O'Hare Intl

11h 22m

2 stops

HOU10:39 pmHouston Hobby

$215

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HoustonSt. Louis

IAH Houston George Bush Intcntl - STL Lambert-St Louis

IAHSTL

Houston George Bush Intcntl

Mon 9/14

6:08 am-1:10 pm

1 stop7h 02m

Lambert-St Louis

Mon 9/21

2:29 pm-7:17 am

1 stop16h 48m

$120

HoustonSt. Louis

IAH Houston George Bush Intcntl - STL Lambert-St Louis

IAHSTL

Houston George Bush Intcntl

Thu 9/17

9:04 pm-1:10 pm

1 stop16h 06m

Lambert-St Louis

Mon 9/21

2:29 pm-7:17 am

1 stop16h 48m

$126

HoustonChicago

IAH Houston George Bush Intcntl - ORD Chicago O'Hare Intl

IAHORD

Houston George Bush Intcntl

Sun 9/20

6:15 am-1:45 pm

1 stop7h 30m

Chicago O'Hare Intl

Wed 9/23

7:25 am-10:30 am

Nonstop3h 05m

$179

HoustonChicago

IAH Houston George Bush Intcntl - ORD Chicago O'Hare Intl

IAHORD

Houston George Bush Intcntl

Sun 9/13

6:15 am-1:45 pm

1 stop7h 30m

Chicago O'Hare Intl

Wed 9/16

7:25 am-10:30 am

Nonstop3h 05m

$179

Quickest round-trip

HoustonChicago

HOU Houston Hobby - MDW Chicago Midway

HOUMDW

Houston Hobby

Tue 9/22

8:50 pm-11:15 pm

Nonstop2h 25m

Chicago Midway

Thu 9/24

5:25 am-7:50 am

Nonstop2h 25m

$185

HoustonChicago

HOU Houston Hobby - MDW Chicago Midway

HOUMDW

Houston Hobby

Tue 9/22

11:25 am-3:30 pm

1 stop4h 05m

Chicago Midway

Thu 9/24

7:25 am-9:55 am

Nonstop2h 30m

$191

HoustonChicago

HOU Houston Hobby - ORD Chicago O'Hare Intl

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-1:18 pm

1 stop7h 48m

$205

HoustonChicago

HOU Houston Hobby - ORD Chicago O'Hare Intl

HOUORD

Houston Hobby

Mon 12/7

5:30 pm-11:59 pm

1 stop6h 29m

Chicago O'Hare Intl

Tue 12/8

3:49 pm-11:13 pm

1 stop7h 24m

$205

HoustonChicago

IAH Houston George Bush Intcntl - ORD Chicago O'Hare Intl

IAHORD

Houston George Bush Intcntl

Thu 10/8

11:33 am-2:22 pm

Nonstop2h 49m

Chicago O'Hare Intl

Mon 10/12

11:00 am-1:51 pm

Nonstop2h 51m

$209

HoustonChicago

IAH Houston George Bush Intcntl - ORD Chicago O'Hare Intl

IAHORD

Houston George Bush Intcntl

Tue 9/22

9:06 am-11:58 am

Nonstop2h 52m

Chicago O'Hare Intl

Thu 10/1

6:53 am-9:40 am

Nonstop2h 47m

$209

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 December. Flight prices, which tend to average around $210, 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 December, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $210.

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 $307. Flights from Houston to Illinois on a Sunday will generally be more expensive and average around $475. 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 $243. Flights at noon are often more expensive with an average ticket price of $656.

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 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 $245 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 $190 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

Best Price Found	$59
Fastest flight time	1h 57m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Houston in the past 72 hours is $59. The best round-trip flight deal from Houston to Illinois found on momondo in the last 72 hours is $120.

The fastest flight from Houston to Illinois takes 1h 57m

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 August 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 5.6 2,661 reviews	Search Frontier flights
United Airlines	PriceFrom $158	Free Cancellation	Rating 7.4 10,104 reviews	Search United Airlines flights
American Airlines	PriceFrom $177	Free Cancellation	Rating 7.1 11,961 reviews	Search American Airlines flights
Southwest	PriceFrom $197	Free Cancellation	Rating 8.0 4,219 reviews	Search Southwest flights
Delta	PriceFrom $228	Free Cancellation	Rating 7.8 8,498 reviews	Search Delta flights
JetBlue	PriceFrom $268	Free Cancellation	Rating 7.1 3,036 reviews	Search JetBlue 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.