What is the cheapest airline that flies from Lambert-St Louis to Chicago?

Southwest, United Airlines, and Frontier are the most popular carriers operating from Lambert-St Louis to Chicago

How many flights depart from St. Louis to Chicago on average per week?

193 flights are operational weekly from St. Louis to Chicago as of October 2025. The most popular departure day for this route is Thu, with 35% of flights per week taking off on this day.

What airlines fly to Chicago?

American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Chicago from St. Louis according to our data. American Airlines is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Chicago. Keep in mind that there are 5 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.

How many flights depart from St. Louis to Chicago on average per day?

As of October 2025, there are 27 flights per day flying from St. Louis to Chicago. The most common time of day flights depart is 8:00AM, with 53% of flights taking off at noon.

Is flying the fastest way to get from St. Louis to Chicago?

The quickest way is to book a flight from St. Louis to Chicago, which can be as quick as 1h 05m onboard Southwest. You can also get a train from St. Louis to Chicago, or a bus from St. Louis to Chicago which can take you longer to arrive at your destination.

Is flying the cheapest way to get from St. Louis to Chicago?

Taking a train to your destination is the cheapest option we’ve found in the past few days. The cheapest price we’ve found for this option is $59, making it less expensive than a flight from St. Louis to Chicago and cheaper than a bus from St. Louis to Chicago.

When did momondo last update prices for flights from Lambert-St Louis Airport to Chicago?

Prices for flights from Lambert-St Louis Airport to Chicago are refreshed on a daily basis.

How many operators does momondo search for flights from Lambert-St Louis Airport to Chicago?

As of October 2025, there are 4 operators available to choose from for flights from Lambert-St Louis Airport to Chicago.

How old do you have to be to fly from Lambert-St Louis Airport to Chicago?

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 Lambert-St Louis Airport to Chicago.

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

The travel and health documents required for your trip to Chicago can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$49 Cheap Flights from St. Louis to Chicago in 2025/26

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Find the cheapest flights from St. Louis to Chicago

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:35 pm - 8:45 pmSTL-MDW

1h 10mnonstop

6:20 am - 7:35 amMDW-STL

1h 15mnonstop

$97Southwest

Find Deal

Thu, Dec 4 - Mon, Dec 8

8:01 pm - 9:30 pmSTL-ORD

1h 29mnonstop

8:50 am - 10:20 amORD-STL

1h 30mnonstop

$97American Airlines

Find Deal

Thu, Dec 18 - Tue, Jan 6

2:25 pm - 7:20 pmSTL-MDW

4h 55m1 stop

6:20 am - 7:35 amMDW-STL

1h 15mnonstop

$107Southwest

Find Deal

Thu, Dec 4 - Mon, Dec 8

12:04 pm - 5:27 pmSTL-ORD

5h 23m1 stop

9:53 pm - 11:22 amORD-STL

13h 29m1 stop

$110Frontier

Find Deal

Thu, Dec 4 - Thu, Dec 4

6:22 pm - 12:59 amSTL-ORD

6h 37m1 stop

6:05 pm - 9:07 amORD-STL

15h 02m1 stop

$119Frontier

Find Deal

Thu, Nov 13 - Tue, Nov 18

6:00 am - 7:27 amSTL-ORD

1h 27mnonstop

4:42 pm - 6:13 pmORD-STL

1h 31mnonstop

$134American Airlines

Find Deal

Wed, Jan 21 - Sat, Jan 31

5:00 pm - 9:46 pmSTL-MDW

4h 46m1 stop

5:25 pm - 11:40 pmMDW-STL

6h 15m1 stop

$157Delta

Find Deal

Tue, Feb 24 - Wed, Feb 25

11:40 am - 4:45 pmSTL-ORD

5h 05m1 stop

5:59 pm - 11:42 pmORD-STL

5h 43m1 stop

$157Delta

Find Deal

Thu, Dec 4 - Mon, Dec 8

8:00 am - 9:29 amSTL-ORD

1h 29mnonstop

9:15 am - 10:52 amORD-STL

1h 37mnonstop

$194United Airlines

Find Deal

Wed, Dec 17 - Sat, Jan 10

8:00 am - 9:29 amSTL-ORD

1h 29mnonstop

10:50 am - 12:15 pmORD-STL

1h 25mnonstop

$207United Airlines

Find Deal

Sun, Dec 7 - Wed, Dec 10

United Airlines flights from St. Louis to Chicago

Our best United Airlines deals on St. Louis to Chicago flight tickets

United Airlines

Dec 17

STL8:00 amLambert-St Louis

1h 29m

ORD9:29 amChicago O'Hare Intl

Jan 10

ORD9:15 amChicago O'Hare Intl

1h 37m

STL10:52 amLambert-St Louis

$194

Find similar

United Airlines

Dec 7

STL8:00 amLambert-St Louis

1h 29m

ORD9:29 amChicago O'Hare Intl

Dec 10

ORD10:50 amChicago O'Hare Intl

1h 25m

STL12:15 pmLambert-St Louis

$207

Find similar

United Airlines

Nov 13

STL6:30 amLambert-St Louis

1h 29m

ORD7:59 amChicago O'Hare Intl

Nov 27

ORD9:20 amChicago O'Hare Intl

1h 31m

STL10:51 amLambert-St Louis

$299

Find similar

American Airlines flights from St. Louis to Chicago

Our best American Airlines deals on St. Louis to Chicago flight tickets

American Airlines

Dec 18

STL8:01 pmLambert-St Louis

1h 29m

ORD9:30 pmChicago O'Hare Intl

Jan 6

ORD8:50 amChicago O'Hare Intl

1h 30m

STL10:20 amLambert-St Louis

$97

Find similar

American Airlines

Jan 21

STL6:00 amLambert-St Louis

1h 27m

ORD7:27 amChicago O'Hare Intl

Jan 31

ORD4:42 pmChicago O'Hare Intl

1h 31m

STL6:13 pmLambert-St Louis

$134

Find similar

American Airlines

Dec 4

STL5:15 amLambert-St Louis

1h 30m

ORD6:45 amChicago O'Hare Intl

Dec 4

ORD12:04 pmChicago O'Hare Intl

1h 25m

STL1:29 pmLambert-St Louis

$166

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 12/4

7:35 pm-8:45 pm

Nonstop1h 10m

Chicago Midway

Mon 12/8

6:20 am-7:35 am

Nonstop1h 15m

$97

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/18

8:01 pm-9:30 pm

Nonstop1h 29m

Chicago O'Hare Intl

Tue 1/6

8:50 am-10:20 am

Nonstop1h 30m

$97

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 12/4

2:25 pm-7:20 pm

1 stop4h 55m

Chicago Midway

Mon 12/8

6:20 am-7:35 am

Nonstop1h 15m

$107

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/4

12:04 pm-5:27 pm

1 stop5h 23m

Chicago O'Hare Intl

Thu 12/4

9:53 pm-11:22 am

1 stop13h 29m

$110

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 11/13

6:22 pm-12:59 am

1 stop6h 37m

Chicago O'Hare Intl

Tue 11/18

6:05 pm-9:07 am

1 stop15h 02m

$119

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/21

6:00 am-7:27 am

Nonstop1h 27m

Chicago O'Hare Intl

Sat 1/31

4:42 pm-6:13 pm

Nonstop1h 31m

$134

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Tue 2/24

5:00 pm-9:46 pm

1 stop4h 46m

Chicago Midway

Wed 2/25

5:25 pm-11:40 pm

1 stop6h 15m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/4

11:40 am-4:45 pm

1 stop5h 05m

Chicago O'Hare Intl

Mon 12/8

5:59 pm-11:42 pm

1 stop5h 43m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 12/17

8:00 am-9:29 am

Nonstop1h 29m

Chicago O'Hare Intl

Sat 1/10

9:15 am-10:52 am

Nonstop1h 37m

$194

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sun 12/7

8:00 am-9:29 am

Nonstop1h 29m

Chicago O'Hare Intl

Wed 12/10

10:50 am-12:15 pm

Nonstop1h 25m

$207

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 St. Louis to Chicago

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 Chicago?

The month of August is, on average, the cheapest month to fly to Chicago from St. Louis, with most prices found around $199. If you’re not able to fly to Chicago in August, then January is your next best option. Flight prices from St. Louis to Chicago during January average around $230.

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

The cheapest day to depart on your flight to Chicago is on a Thursday when prices can be found for as low as $679. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Chicago for around $909.

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

Our most recent data shows that the best time of day to fly to Chicago is in the morning. Flights from St. Louis to Chicago during this time can be as low as $607. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $1,225.

What is the cheapest Lambert-St Louis to Chicago flight route?

Fly from Lambert-St Louis to Chicago Midway for the best Lambert-St Louis - Chicago flight prices

How far in advance should I book a flight to Chicago?

You are more likely to see cheaper flights to Chicago from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $280 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from St. Louis for as low as $178 on momondo.

What cabin class options are available on Lambert-St Louis to Chicago flights?

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

How have St. Louis to Chicago flight prices changed over time?

As of October 2025, prices for St. Louis to Chicago flights are approximately 31% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Chicago

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Chicago according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Chicago (STL to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Chicago

Best Price Found	$158
Fastest flight time	1h 05m
Direct flights	Every day
Airports in Chicago	2 airports

The best one-way flight to Chicago from St. Louis in the past 72 hours is $158. The best round-trip flight deal from St. Louis to Chicago found on momondo in the last 72 hours is $273.

The fastest flight from St. Louis to Chicago takes 1h 05m

Direct flights go from St. Louis to Chicago every day.

There are 2 airports near Chicago: Chicago O'Hare Intl (ORD), Chicago Midway (MDW)

Search flight deals

Is flying the fastest way to get from St. Louis to Chicago?
The quickest way is to book a flight from St. Louis to Chicago, which can be as quick as 1h 05m onboard Southwest. You can also get a train from St. Louis to Chicago, or a bus from St. Louis to Chicago which can take you longer to arrive at your destination.
Is flying the cheapest way to get from St. Louis to Chicago?
Taking a train to your destination is the cheapest option we’ve found in the past few days. The cheapest price we’ve found for this option is $59, making it less expensive than a flight from St. Louis to Chicago and cheaper than a bus from St. Louis to Chicago.
How far is Lambert-St Louis to Chicago by plane?
Lambert-St Louis and Chicago are 262.0 mi apart from one another. Flights usually cover this in 1h 05m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to Chicago?
Prices for flights from Lambert-St Louis Airport to Chicago are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Chicago?
As of October 2025, there are 4 operators available to choose from for flights from Lambert-St Louis Airport to Chicago.
How old do you have to be to fly from Lambert-St Louis Airport to Chicago?
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 Lambert-St Louis Airport to Chicago.
What documentation or ID do you need to fly to Chicago?
The travel and health documents required for your trip to Chicago can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from St. Louis to Chicago?
Based on momondo bookings for flights between St. Louis and Chicago, the leading plane model is Airbus A319, making up 14.05% of the total bookings. Other popular models include Boeing 737-800 with 12.61%, Canadair (Bombardier) Regional Jet CRJ-550 with 10.04%, and Canadair (Bombardier) Regional Jet 700 with 9.30%.
What is the most popular airline from St. Louis to Chicago?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Chicago is Southwest, representing 37% of all bookings. The subsequent popular airlines are American Airlines at 28%, United Airlines at 18%, and Southern / Mokulele at 17%.

Best airlines flying from St. Louis to Chicago

Compare and see reviews for airlines that fly from St. Louis to Chicago with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $113	Free Cancellation	Rating 7.2 11,034 reviews	Search American Airlines flights
United Airlines	PriceFrom $115	Free Cancellation	Rating 7.4 8,999 reviews	Search United Airlines flights
Southwest	PriceFrom $117	Free Cancellation	Rating 8.0 4,243 reviews	Search Southwest flights
Southern / Mokulele	PriceFrom $140	Free Cancellation	Rating 0.0 0 reviews	Search Southern / Mokulele flights

Southwest Flights From St. Louis to Chicago
Southwest flight deals from St. Louis to Chicago start from $117 round-trip. Over the 4 Southwest flights for this route in a normal week, average airfare is usually $322 round-trip - but some users have found much cheaper deals with momondo.
United Airlines Flights From St. Louis to Chicago
United Airlines (7.4/10 from 8,999 reviews) operates around 29 flights from St. Louis to Chicago in any given week. The average United Airlines airfare for this route is around $311, with deals from around $115 rare but found on momondo. Referenced prices are for round-trip St. Louis to Chicago flight searches in the last 72 hours.

Merrillville

New Buffalo

Hammond

Benton Harbor

Saint Joseph

Portage

Lansing

Schererville

Valparaiso

Crown Point

Munster

Chesterton

Monticello

Porter

Griffith

Saint John

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Chicago?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from St. Louis.

Can I find flights from St. Louis to Chicago with flexible booking policies on momondo?

All flight searches from St. Louis to Chicago on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Chicago?

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 Chicago from St. Louis.

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

If you are not ready to book a flight from St. Louis to Chicago now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Chicago and let you know when they change.