What airlines fly to St. Louis?

American Airlines, United Airlines and Southern / Mokulele are the top three most popular airlines that fly to St. Louis from Chicago according to our data. American Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest travel time from Chicago to St. Louis?

Flights connecting via Quincy (UIN) have the shortest average one-way travel time: 3h 35m.

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

The number of flights available between Chicago and St. Louis is 52 per day as of November 2025. The most frequent departure time is 6:00PM, with 41% of daily flights leaving in the afternoon.

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

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

Which layover airport offers the lowest fares from Chicago to St. Louis?

Flights via Burlington (BRL) offer the lowest average round-trip price of $156.

Which airport is the most popular layover for flights between Chicago and St. Louis?

Quincy (UIN) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Chicago to St. Louis?

Quincy (UIN) has the shortest average layover time for this route: 0h 38m.

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

As of November 2025, there are 369 flights per week flying from Chicago to St. Louis. The most common day of the week flights depart is Fri, with 19% of flights taking off on this day.

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

A train from Chicago to St. Louis is currently going to be the least expensive option currently available. You can also find deals for a flight from Chicago to St. Louis starting at $134, or consider a bus from Chicago to St. Louis starting at $77. Both of these alternative options are worth considering when looking to reach your destination.

What is the carbon footprint of flying from Chicago to Lambert-St Louis?

The carbon footprint of a Chicago to Lambert-St Louis flight is around 162lb, which may vary slightly based on airline and stops. There is a CO2 sorter on our flight search results to help you select the lowest possible footprint. The carbon footprint of a train for this route is 64% less. If you can take the time, the carbon footprint of a bus for this journey would be 37lb, some 78% less than flying.

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

Prices for flights from Chicago to Lambert-St Louis Airport were last updated today.

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

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

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

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 Chicago to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The travel and health documents required for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

Q: What is the typical price of a round-trip flight between Chicago and St. Louis?

Prices are currently low for flights on this route. Typical prices usually range from $229 to $554. The lowest price recently found on this route was $134.

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Cheap round-trip flights

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11:25 am - 12:35 pmMDW-STL

1h 10mnonstop

2:30 pm - 3:40 pmSTL-MDW

1h 10mnonstop

$134Southwest

Find Deal

Thu, Jan 1 - Mon, Jan 5

7:07 am - 8:35 amORD-STL

1h 28mnonstop

4:53 pm - 6:37 pmSTL-ORD

1h 44mnonstop

$134American Airlines

Find Deal

Thu, Jan 1 - Mon, Jan 5

7:07 am - 8:35 amORD-STL

1h 28mnonstop

9:08 am - 10:35 amSTL-ORD

1h 27mnonstop

$135American Airlines

Find Deal

Thu, Jan 1 - Mon, Jan 5

2:40 pm - 7:55 pmORD-STL

5h 15m1 stop

5:45 am - 11:10 amSTL-ORD

5h 25m1 stop

$137Southwest

Find Deal

Tue, Mar 31 - Tue, Apr 7

9:23 pm - 10:45 pmORD-STL

1h 22mnonstop

10:00 am - 11:29 amSTL-ORD

1h 29mnonstop

$144United Airlines

Find Deal

Sat, Dec 6 - Tue, Dec 9

5:59 pm - 10:16 pmMDW-STL

4h 17m1 stop

5:13 pm - 10:22 pmSTL-MDW

5h 09m1 stop

$157Delta

Find Deal

Wed, Dec 24 - Wed, Dec 31

6:35 am - 11:12 amORD-STL

4h 37m1 stop

10:19 am - 5:21 pmSTL-ORD

7h 02m1 stop

$157Delta

Find Deal

Wed, Dec 31 - Tue, Jan 13

9:33 pm - 7:47 pmORD-STL

22h 14m1 stop

4:27 pm - 3:34 pmSTL-ORD

23h 07m1 stop

$167Frontier

Find Deal

Thu, Jan 1 - Mon, Jan 5

9:33 pm - 7:47 pmORD-STL

22h 14m1 stop

4:27 pm - 3:34 pmSTL-ORD

23h 07m1 stop

$173Frontier

Find Deal

Thu, Jan 1 - Mon, Jan 5

9:10 pm - 10:43 pmORD-STL

1h 33mnonstop

3:11 pm - 4:55 pmSTL-ORD

1h 44mnonstop

$204United Airlines

Find Deal

Tue, Dec 30 - Tue, Jan 13

Southwest flights from Chicago to St. Louis

Our best Southwest deals on Chicago to St. Louis flight tickets

Southwest

Jan 1

MDW11:25 amChicago Midway

1h 10m

STL12:35 pmLambert-St Louis

Jan 5

STL2:30 pmLambert-St Louis

1h 10m

MDW3:40 pmChicago Midway

$134

Find similar

Southwest

Mar 31

ORD2:40 pmChicago O'Hare Intl

5h 15m

1 stop

STL7:55 pmLambert-St Louis

Apr 7

STL5:45 amLambert-St Louis

5h 25m

1 stop

ORD11:10 amChicago O'Hare Intl

$137

Find similar

Southwest

Jan 1

MDW5:00 amChicago Midway

5h 10m

1 stop

STL10:10 amLambert-St Louis

Jan 5

STL2:30 pmLambert-St Louis

1h 10m

MDW3:40 pmChicago Midway

$144

Find similar

Delta flights from Chicago to St. Louis

Our best Delta deals on Chicago to St. Louis flight tickets

Delta

Dec 24

MDW5:59 pmChicago Midway

4h 17m

1 stop

STL10:16 pmLambert-St Louis

Dec 31

STL5:13 pmLambert-St Louis

5h 09m

1 stop

MDW10:22 pmChicago Midway

$157

Find similar

Delta

Dec 31

ORD6:35 amChicago O'Hare Intl

4h 37m

1 stop

STL11:12 amLambert-St Louis

Jan 13

STL6:10 amLambert-St Louis

6h 57m

2 stops

ORD1:07 pmChicago O'Hare Intl

$162

Find similar

Delta

Jan 1

MDW5:59 pmChicago Midway

4h 17m

1 stop

STL10:16 pmLambert-St Louis

Jan 5

STL6:35 amLambert-St Louis

6h 13m

1 stop

MDW12:48 pmChicago Midway

$174

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 1/1

11:25 am-12:35 pm

Nonstop1h 10m

Lambert-St Louis

Mon 1/5

2:30 pm-3:40 pm

Nonstop1h 10m

$134

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/1

7:07 am-8:35 am

Nonstop1h 28m

Lambert-St Louis

Mon 1/5

4:53 pm-6:37 pm

Nonstop1h 44m

$134

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/1

7:07 am-8:35 am

Nonstop1h 28m

Lambert-St Louis

Mon 1/5

9:08 am-10:35 am

Nonstop1h 27m

$135

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 3/31

2:40 pm-7:55 pm

1 stop5h 15m

Lambert-St Louis

Tue 4/7

5:45 am-11:10 am

1 stop5h 25m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 12/6

9:23 pm-10:45 pm

Nonstop1h 22m

Lambert-St Louis

Tue 12/9

10:00 am-11:29 am

Nonstop1h 29m

$144

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Wed 12/24

5:59 pm-10:16 pm

1 stop4h 17m

Lambert-St Louis

Wed 12/31

5:13 pm-10:22 pm

1 stop5h 09m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 12/31

6:35 am-11:12 am

1 stop4h 37m

Lambert-St Louis

Tue 1/13

10:19 am-5:21 pm

1 stop7h 02m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/1

9:33 pm-7:47 pm

1 stop22h 14m

Lambert-St Louis

Mon 1/5

4:27 pm-3:34 pm

1 stop23h 07m

$167

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/1

9:33 pm-7:47 pm

1 stop22h 14m

Lambert-St Louis

Mon 1/5

4:27 pm-3:34 pm

1 stop23h 07m

$173

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 12/30

9:10 pm-10:43 pm

Nonstop1h 33m

Lambert-St Louis

Tue 1/13

3:11 pm-4:55 pm

Nonstop1h 44m

$204

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 Chicago to St. Louis

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

Layovers

Other information

What is the typical price of a round-trip flight between Chicago and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, August is the cheapest month to fly from Chicago to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $257. The month of April is another great option to travel to St. Louis, with average flight prices from Chicago averaging around $269.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $308. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $510. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Chicago at noon is the least expensive time of day to depart. momondo users have found prices as low as $314 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $432 per ticket.

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

Fly from Chicago O'Hare Intl to Lambert-St Louis for the best Chicago - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $295 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Chicago for as low as $142 on momondo.

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

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

Can stopping save me money on Chicago to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Chicago to St. Louis.

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

As of November 2025, prices for Chicago to St. Louis flights are approximately 41% cheaper when compared to flights at the same time last year.

When to book flights from Chicago to St. Louis

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

Estimated round-trip price

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

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

Best Price Found	$128
Fastest flight time	1h 10m
Direct flights	Every day
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Chicago in the past 72 hours is $128. The best round-trip flight deal from Chicago to St. Louis found on momondo in the last 72 hours is $227.

The fastest flight from Chicago to St. Louis takes 1h 10m

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

There is 1 airport near St. Louis: Lambert-St Louis (STL)

Search flight deals

Is flying the cheapest way to get from Chicago to St. Louis?
A train from Chicago to St. Louis is currently going to be the least expensive option currently available. You can also find deals for a flight from Chicago to St. Louis starting at $134, or consider a bus from Chicago to St. Louis starting at $77. Both of these alternative options are worth considering when looking to reach your destination.
How far is Chicago to Lambert-St Louis by plane?
There are 262.0 mi between Chicago and Lambert-St Louis. Typically, this will take 1h 10m by plane in normal conditions.
What is the carbon footprint of flying from Chicago to Lambert-St Louis?
The carbon footprint of a Chicago to Lambert-St Louis flight is around 162lb, which may vary slightly based on airline and stops. There is a CO2 sorter on our flight search results to help you select the lowest possible footprint. The carbon footprint of a train for this route is 64% less. If you can take the time, the carbon footprint of a bus for this journey would be 37lb, some 78% less than flying.
When did momondo last update prices for flights from Chicago to Lambert-St Louis Airport?
Prices for flights from Chicago to Lambert-St Louis Airport were last updated today.
How many operators does momondo search for flights from Chicago to Lambert-St Louis Airport?
As of November 2025, there are 4 operators available to choose from for flights from Chicago to Lambert-St Louis Airport.
How old do you have to be to fly from Chicago to Lambert-St Louis Airport?
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 Chicago to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents required for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. 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 Chicago to St. Louis?
momondo data reveals that the most frequently booked plane model on the route from Chicago to St. Louis is Boeing 737-800, representing 12.28% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 10.76%, Canadair (Bombardier) Regional Jet 700 at 10.76%, and Airbus A319 at 10.43%.
What is the most popular airline from Chicago to St. Louis?
Based on momondo bookings for flights between Chicago and St. Louis, the leading airline is Southwest, making up 40% of the total bookings. Other popular airlines include United Airlines with 26%, American Airlines with 22%, and Southern / Mokulele with 12%.

Best airlines flying from Chicago to St. Louis

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

Airline	Rating	Free Cancellation	Price
Southwest	PriceFrom $77	Free Cancellation	Rating 8.0 4,236 reviews	Search Southwest flights
American Airlines	PriceFrom $115	Free Cancellation	Rating 7.2 11,045 reviews	Search American Airlines flights
Southern / Mokulele	PriceFrom $145	Free Cancellation	Rating 0.0 0 reviews	Search Southern / Mokulele flights
United Airlines	PriceFrom $152	Free Cancellation	Rating 7.4 9,012 reviews	Search United Airlines flights

Southwest Flights From Chicago to St. Louis
Southwest operates around 19 flights from Chicago to St. Louis every week. The average price of these flights found in the last 72 hours has been $298, but momondo users have found Southwest deals from Chicago to St. Louis from as low as $77 round-trip. Southwest has been scored 8.0/10 in 4,236 reviews.
United Airlines Flights From Chicago to St. Louis
Across 9,012 United Airlines reviews on momondo, the average score is 7.4/10. United Airlines flies from Chicago to St. Louis about 53 times each week, with ticket deals ranging from $152 to $306. Price data is based on momondo searches in the last 72 hours.

St. Charles

Chesterfield

Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Wentzville

Fenton

Collinsville

St. Peters

Alton

Farmington

Festus

Glencoe

Edwardsville

Clayton

Eureka

Litchfield

Shrewsbury

Why use momondo?

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

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 St. Louis from Chicago.

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

Yes. momondo allows you to filter the results for Chicago to St. Louis flights to just show those with flexible booking policies.

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

Once you have performed a search for Chicago to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to St. Louis from Chicago are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

Choose the best way to get from Chicago to St. Louis

Buses

5h 45m

$37 one-way$77 round-trip

Nonstop · from $77

Distance to downtown

ZSV • 0.4 mi

37lb CO2

77% less than flights

Find Buses

Chicago to St. Louis Buses

Trains

4h 46m

$27 one-way$54 round-trip

Nonstop · from $54

Distance to downtown

ZSV • 0.4 mi

59lb CO2

64% less than flights

Find Trains

Chicago to St. Louis Trains

Flights

1h 15m

$49 one-way$134 round-trip

Nonstop · from $1341 stop · from $64

Distance to downtown

STL • 12.7 mi

162lb CO2

Find Flights

Chicago to St. Louis Flights

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Cheap flights from Chicago to St. Louis from $49

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to St. Louis departing on 1/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Southwest flights from Chicago to St. Louis

Our best Southwest deals on Chicago to St. Louis flight tickets

Delta flights from Chicago to St. Louis

Our best Delta deals on Chicago to St. Louis flight tickets

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How to get the cheapest flight ticket from Chicago to St. Louis

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

What is the typical price of a round-trip flight between Chicago and St. Louis?

What is the cheapest month to fly to St. Louis?

What is the cheapest day to depart on your flight to St. Louis?

What is the cheapest time of day to depart on your flight to St. Louis?

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

Fly from Chicago O'Hare Intl to Lambert-St Louis for the best Chicago - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

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

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

Can stopping save me money on Chicago to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Chicago to St. Louis.

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

As of November 2025, prices for Chicago to St. Louis flights are approximately 41% cheaper when compared to flights at the same time last year.

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

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

What airlines fly to St. Louis?

Which airport is the most popular layover for flights between Chicago and St. Louis?

Quincy (UIN) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Chicago to St. Louis?

Flights via Burlington (BRL) offer the lowest average round-trip price of $156.

Which layover airport has the shortest travel time from Chicago to St. Louis?

Flights connecting via Quincy (UIN) have the shortest average one-way travel time: 3h 35m.

Which layover airport has the shortest connection time from Chicago to St. Louis?

Quincy (UIN) has the shortest average layover time for this route: 0h 38m.

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

The number of flights available between Chicago and St. Louis is 52 per day as of November 2025. The most frequent departure time is 6:00PM, with 41% of daily flights leaving in the afternoon.

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

As of November 2025, there are 369 flights per week flying from Chicago to St. Louis. The most common day of the week flights depart is Fri, with 19% of flights taking off on this day.

When to book flights from Chicago to St. Louis

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

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

Best Price Found

Fastest flight time

Direct flights

Airports in St. Louis

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

How far is Chicago to Lambert-St Louis by plane?

What is the carbon footprint of flying from Chicago to Lambert-St Louis?

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

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

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

What documentation or ID do you need to fly to Lambert-St Louis Airport?

What is the most popular plane model from Chicago to St. Louis?

What is the most popular airline from Chicago to St. Louis?

Best airlines flying from Chicago to St. Louis

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

Southwest Flights From Chicago to St. Louis

United Airlines Flights From Chicago to St. Louis

Traveling to a place near St. Louis?

Why use momondo?

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

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

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

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

Choose the best way to get from Chicago to St. Louis

An easier way to manage your St. Louis trip