How often are flights from Chicago to St. Louis delayed?

About 16% of weekly flights between Chicago and St. Louis have experienced delays in the past year, with the average delay time being 123 minutes.

Which airline has the best punctuality record on Chicago to St. Louis flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 16% of flights being delayed.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

What is the most punctual flight time for Chicago to St. Louis flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

How long is the flight from Chicago O'Hare Intl Airport to St. Louis?

United Airlines can get you from Chicago O'Hare Intl Airport to St. Louis in just under 1h 28m. Your travel time will be generally consistent. Airlines will cover a distance of 258 mi. All flights are typically nonstop.

What are the cheapest airlines flying from Chicago O'Hare Intl Airport to St. Louis round-trip?

Flying on American Airlines is currently your cheapest option to St. Louis, with prices starting at $115. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $144 and $145, respectively. American Airlines is 59% cheaper than the average price of flights available within the next 90 days to this destination.

What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to St. Louis one-way?

$48 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on United Airlines and Southern / Mokulele, with prices starting from $58 and $78, respectively.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the cheapest flights from Chicago O'Hare Intl Airport to St. Louis?

While on average a flight from Chicago O'Hare Intl Airport to St. Louis is generally $316, our data shows the cheapest flight currently is $58. When looking at the most popular route, (Chicago O'Hare Intl - Lambert-St Louis), you can expect to pay $141 for that flight.

What are the most reliable airlines from Chicago O'Hare Intl Airport to St. Louis?

Before booking your flight to St. Louis from Chicago O'Hare Intl Airport, check out the most reliable airlines to get you to your destination on time: Envoy Air (81%), Turkish Airlines (79%), Austrian Airlines( 76%).

What are the most popular airlines that fly from Chicago O'Hare Intl Airport to St. Louis?

Before booking your flight from Chicago O'Hare Intl Airport to St. Louis check out the most popular airlines for this route: United Airlines, American Airlines or Southern / Mokulele.

Most accurate provider : When it comes to deals on Chicago O'Hare Intl Airport-St. Louis flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Chicago O'Hare Intl Airport-St. Louis flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Chicago O'Hare Intl Airport-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Chicago O'Hare Intl Airport-St. Louis flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago O'Hare Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to St. Louis from Chicago O'Hare Intl?

Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Chicago O'Hare Intl. On average, Lambert-St Louis has 16 inbound flights from Chicago O'Hare Intl per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

Can I find deals for flights from O'Hare Intl to St. Louis that include hotel bookings?

Yes. In addition to deals on O'Hare Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from O'Hare Intl to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to St. Louis.

Can I find deals for business class flights from O'Hare Intl to St. Louis?

Yes. Cheapflights offers flight deals from O'Hare Intl to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$68+ Flights from Chicago O'Hare Intl Airport to St. Louis

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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Lambert-St Louis are usually found in September or August, booked 78 days in advance, depart on a Wednesday or Friday and return on a Thursday

Cheap flight deals from O'Hare Intl to St. Louis

Cheapest flights from O'Hare Intl to St. Louis
Explore the most affordable flight options available from O'Hare Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

Wed 12/317:14 amORD - STL

Nonstop1h 34mAmerican Airlines

Tue 1/136:00 amSTL - ORD

Nonstop1h 27mAmerican Airlines

Deal found 12/18

$188

Wed 12/315:31 pmORD - STL

1 stop6h 07mDelta

Tue 1/136:00 amSTL - ORD

1 stop4h 59mDelta

Deal found 12/17

$204

Wed 12/3111:23 amORD - STL

1 stop11h 10mFrontier

Thu 1/110:42 amSTL - ORD

1 stop7h 51mFrontier

Deal found 12/15

$208

Wed 12/243:00 pmORD - STL

Nonstop1h 27mUnited Airlines

Thu 12/259:55 amSTL - ORD

Nonstop1h 35mUnited Airlines

Deal found 12/16

$215

Wed 12/247:07 amORD - STL

Nonstop1h 28mAmerican Airlines

Thu 12/259:08 amSTL - ORD

Nonstop1h 27mAmerican Airlines

Deal found 12/16

$226

Wed 12/3111:23 amORD - STL

1 stop11h 10mFrontier

Sun 1/410:57 amSTL - ORD

1 stop11h 27mFrontier

Deal found 12/16

$267

Thu 12/255:50 pmORD - STL

Nonstop1h 28mUnited Airlines

Wed 12/315:02 pmSTL - ORD

Nonstop1h 43mUnited Airlines

Deal found 12/15

$275

Best flights from O'Hare Intl to St. Louis
Discover carefully curated flight deals from O'Hare Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.

Thu 1/85:50 amORD - STL

1 stop8h 58mMultiple Airlines

Mon 1/125:11 pmSTL - ORD

1 stop20h 02mMultiple Airlines

Deal found 12/17

$139

Wed 1/142:35 pmORD - STL

Nonstop1h 28mUnited Airlines

Wed 1/219:57 amSTL - ORD

Nonstop1h 35mUnited Airlines

Deal found 12/17

$153

Wed 1/147:05 amORD - STL

1 stop7h 43mDelta

Wed 1/217:10 amSTL - ORD

1 stop6h 30mDelta

Deal found 12/17

$173

Thu 1/85:50 amORD - STL

1 stop8h 58mFrontier

Mon 1/125:11 pmSTL - ORD

2 stops18h 57mFrontier

Deal found 12/17

$175

Tue 1/135:57 pmORD - STL

1 stop12h 54mMultiple Airlines

Tue 1/205:42 pmSTL - ORD

1 stop19h 31mMultiple Airlines

Deal found 12/17

$141

Tue 2/177:40 pmORD - STL

Nonstop1h 25mUnited Airlines

Sat 2/217:41 amSTL - ORD

Nonstop1h 29mUnited Airlines

Deal found 12/17

$162

Wed 1/286:15 amORD - STL

1 stop4h 28mDelta

Wed 1/285:04 pmSTL - ORD

1 stop6h 52mDelta

Deal found 12/16

$173

Tue 2/176:02 pmORD - STL

1 stop12h 49mFrontier

Sat 2/218:17 pmSTL - ORD

1 stop14h 29mFrontier

Deal found 12/17

$180

Thu 1/291:00 pmORD - STL

Nonstop1h 30mUnited Airlines

Sat 1/319:57 amSTL - ORD

Nonstop1h 35mUnited Airlines

Deal found 12/16

$171

Thu 1/1510:52 amORD - STL

Nonstop1h 37mUnited Airlines

Thu 1/229:57 amSTL - ORD

Nonstop1h 35mUnited Airlines

Deal found 12/18

$171

Last-minute flights from O'Hare Intl to St. Louis
Discover last-minute flight deals from O'Hare Intl to St. Louis. Data last updated December 18, 2025 and is based on user searches.

Wed 1/74:49 pmORD - STL

1 stop21h 59mMultiple Airlines

Sun 1/115:11 pmSTL - ORD

1 stop26h 30mMultiple Airlines

Deal found 12/17

$142

Wed 1/712:09 pmORD - STL

1 stop10h 24mMultiple Airlines

Thu 1/83:43 pmSTL - ORD

1 stop6h 56mMultiple Airlines

Deal found 12/16

$154

Thu 1/85:50 amORD - STL

1 stop8h 58mMultiple Airlines

Mon 1/125:11 pmSTL - ORD

1 stop20h 02mMultiple Airlines

Deal found 12/17

$139

Mon 1/128:43 pmORD - STL

2 stops34h 08mMultiple Airlines

Mon 1/198:32 pmSTL - ORD

1 stop17h 25mMultiple Airlines

Deal found 12/15

$160

Tue 1/131:20 pmORD - STL

1 stop17h 31mMultiple Airlines

Tue 1/205:42 pmSTL - ORD

1 stop24h 10mMultiple Airlines

Deal found 12/16

$141

Tue 1/138:50 amORD - STL

Nonstop1h 30mAmerican Airlines

Tue 1/2011:05 amSTL - ORD

Nonstop1h 29mAmerican Airlines

Deal found 12/16

$153

Tue 1/202:53 pmORD - STL

1 stop15h 58mMultiple Airlines

Wed 1/218:22 pmSTL - ORD

2 stops15h 00mMultiple Airlines

Deal found 12/15

$159

Wed 1/2110:48 amORD - STL

1 stop12h 45mMultiple Airlines

Wed 1/288:22 pmSTL - ORD

1 stop17h 15mMultiple Airlines

Deal found 12/17

$143

Thu 1/2210:48 amORD - STL

1 stop12h 45mMultiple Airlines

Sat 1/243:46 pmSTL - ORD

1 stop19h 11mMultiple Airlines

Deal found 12/15

$156

One-way flights from O'Hare Intl to St. Louis
Search for one-way flight options from O'Hare Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated December 18, 2025.

Tue 1/202:53 pmORD - STL

1 stop15h 58mFrontier

Deal found 12/16

$68

Wed 3/47:40 pmORD - STL

Nonstop1h 25mUnited Airlines

Deal found 12/16

$77

Wed 1/77:20 amORD - STL

1 stop15h 13mMultiple Airlines

Deal found 12/16

$79

Thu 2/1211:51 amORD - STL

1 stop9h 35mFrontier

Deal found 12/16

$81

Tue 1/207:20 amORD - STL

2 stops23h 31mMultiple Airlines

Deal found 12/16

$84

Fri 1/162:30 pmORD - STL

1 stop24h 18mFrontier

Deal found 12/14

$85

Mon 1/129:25 pmORD - STL

Nonstop1h 33mUnited Airlines

Deal found 12/15

$86

Thu 1/88:27 pmORD - STL

1 stop11h 23mFrontier

Deal found 12/16

$87

Mon 1/2611:51 amORD - STL

1 stop11h 42mFrontier

Deal found 12/15

$88

Wed 1/1410:48 amORD - STL

1 stop11h 46mMultiple Airlines

Deal found 12/15

$91

Tue 2/176:30 amORD - STL

2 stops8h 17mDelta

Deal found 12/16

$92

Find flight deals from O'Hare Intl to St. Louis

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$139 (Kiwi.com)
One-way from	$68 (Kiwi.com)
Popular in	December
Cheapest in	September
Average price	$324
Good round-trip deal	$213 or less
Good one-way deal	$128 or less

Provider with most accurate pricing for Chicago O'Hare Intl-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Chicago O'Hare Intl-Lambert-St Louis flights.

Search Deals

From Chicago O'Hare Intl to Lambert-St Louis

Search Deals

One-way flight from Chicago O'Hare Intl to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($23 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Price to beat on a round-trip flight from Chicago O'Hare Intl to Lambert-St Louis.

Search Deals

Price to beat on a one-way flight from Chicago O'Hare Intl to Lambert-St Louis.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/8

5:50 am-2:48 pm

1 stop8h 58m

Lambert-St Louis

Mon 1/12

5:11 pm-1:13 pm

1 stop20h 02m

$139

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 1/13

5:57 pm-6:51 am

1 stop12h 54m

Lambert-St Louis

Tue 1/20

5:42 pm-1:13 pm

1 stop19h 31m

$141

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 1/14

2:35 pm-4:03 pm

Nonstop1h 28m

Lambert-St Louis

Wed 1/21

9:57 am-11:32 am

Nonstop1h 35m

$153

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 2/17

7:40 pm-9:05 pm

Nonstop1h 25m

Lambert-St Louis

Sat 2/21

7:41 am-9:10 am

Nonstop1h 29m

$162

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/29

1:00 pm-2:30 pm

Nonstop1h 30m

Lambert-St Louis

Sat 1/31

9:57 am-11:32 am

Nonstop1h 35m

$171

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/15

10:52 am-12:29 pm

Nonstop1h 37m

Lambert-St Louis

Thu 1/22

9:57 am-11:32 am

Nonstop1h 35m

$171

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 1/14

7:05 am-2:48 pm

1 stop7h 43m

Lambert-St Louis

Wed 1/21

7:10 am-1:40 pm

1 stop6h 30m

$173

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 1/28

6:15 am-10:43 am

1 stop4h 28m

Lambert-St Louis

Wed 1/28

5:04 pm-11:56 pm

1 stop6h 52m

$173

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/8

5:50 am-2:48 pm

1 stop8h 58m

Lambert-St Louis

Mon 1/12

5:11 pm-12:08 pm

2 stops18h 57m

$175

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 2/17

6:02 pm-6:51 am

1 stop12h 49m

Lambert-St Louis

Sat 2/21

8:17 pm-10:46 am

1 stop14h 29m

$180

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 20 results

Compare providers for flights from O'Hare Intl to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from O'Hare Intl to St. Louis in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Mytrip	Price Accuracy3 stars	Trust Score*3 stars
Cheapfaremart	Price Accuracy-	Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Chicago O'Hare Intl Airport-St. Louis flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Chicago O'Hare Intl Airport-St. Louis flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Chicago O'Hare Intl Airport-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Chicago O'Hare Intl Airport-St. Louis flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago O'Hare Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from O'Hare Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from O'Hare Intl with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Chicago O'Hare Intl Airport to St. Louis

Prices

Delays

How far ahead should I book a flight from Chicago O'Hare Intl Airport to St. Louis?

The price you pay for your flight from Chicago O'Hare Intl Airport to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 78 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to St. Louis?

Currently, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $79). Flying from Chicago O'Hare Intl Airport to St. Louis in July is currently the most expensive (average of $172). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ORD to STL?

It’s typically best to fly out from Chicago O'Hare Intl Airport to St. Louis in the evening. Doing so could potentially save you 25% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from Chicago O'Hare Intl Airport to St. Louis?

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to St. Louis flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Chicago O'Hare Intl Airport to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Chicago O'Hare Intl Airport to St. Louis trip

Airports

ORD

For a quick departure, use the "L" train to avoid traffic and reach ORD efficiently from downtown Chicago.

STL

Use the MetroLink light rail for a convenient and economical ride from STL to downtown St. Louis in about 40 minutes.

Our travel experts

Ramsey Qubein

Expert on ORD

Taryn White

Expert on STL

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with United Airlines, American Airlines, and Southern / Mokulele from Chicago O'Hare Intl Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

United Airlines

7.4

Good

9,091 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

American Airlines

7.2

Good

11,054 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

Southern / Mokulele

6.8

Okay

30 reviews

United Airlines

7.4

Good

9,091 reviews

Reviews

1 / 20

4.0

Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

Related info for your journey

What airport do you fly into for flights to St. Louis from Chicago O'Hare Intl?
Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Chicago O'Hare Intl. On average, Lambert-St Louis has 16 inbound flights from Chicago O'Hare Intl per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.
How long is the flight from Chicago O'Hare Intl Airport to St. Louis?
United Airlines can get you from Chicago O'Hare Intl Airport to St. Louis in just under 1h 28m. Your travel time will be generally consistent. Airlines will cover a distance of 258 mi. All flights are typically nonstop.
What are the cheapest airlines flying from Chicago O'Hare Intl Airport to St. Louis round-trip?
Flying on American Airlines is currently your cheapest option to St. Louis, with prices starting at $115. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $144 and $145, respectively. American Airlines is 59% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to St. Louis one-way?
$48 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on United Airlines and Southern / Mokulele, with prices starting from $58 and $78, respectively.
What are the most reliable airlines from Chicago O'Hare Intl Airport to St. Louis?
Before booking your flight to St. Louis from Chicago O'Hare Intl Airport, check out the most reliable airlines to get you to your destination on time: Envoy Air (81%), Turkish Airlines (79%), Austrian Airlines( 76%).
What are the cheapest flights from Chicago O'Hare Intl Airport to St. Louis?
While on average a flight from Chicago O'Hare Intl Airport to St. Louis is generally $316, our data shows the cheapest flight currently is $58. When looking at the most popular route, (Chicago O'Hare Intl - Lambert-St Louis), you can expect to pay $141 for that flight.
Can I find deals for flights from O'Hare Intl to St. Louis that include hotel bookings?
Yes. In addition to deals on O'Hare Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from O'Hare Intl to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to St. Louis.
Can I find deals for business class flights from O'Hare Intl to St. Louis?
Yes. Cheapflights offers flight deals from O'Hare Intl to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to St. Louis?
Currently, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $79). Flying from Chicago O'Hare Intl Airport to St. Louis in July is currently the most expensive (average of $172). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Other flights to St. Louis

Top 3 airlines flying from O'Hare Intl to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$115	Average$300	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$144	Average$304	FlexibilityNo cancel fee	On-time69%
Southern / Mokulele	Cheapest$145	Average$213	FlexibilityNo cancel fee	On-timeN/A

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$68+ Cheap flights from O'Hare Intl (ORD) to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/20. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from O'Hare Intl to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Chicago O'Hare Intl to Lambert-St Louis are usually found in September or August, booked 78 days in advance, depart on a Wednesday or Friday and return on a Thursday

Cheap flight deals from O'Hare Intl to St. Louis

Cheapest flights from O'Hare Intl to St. LouisExplore the most affordable flight options available from O'Hare Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

Explore the most affordable flight options available from O'Hare Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

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Best time to book a flight from O'Hare Intl to St. Louis

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Cheapflights Insights

Everything you need to know about your flight from Chicago O'Hare Intl Airport to St. Louis

How far ahead should I book a flight from Chicago O'Hare Intl Airport to St. Louis?

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to St. Louis?

What is the cheapest time of day to fly from ORD to STL?

What is the cheapest day to fly from Chicago O'Hare Intl Airport to St. Louis?

How often are flights from Chicago to St. Louis delayed?

What is the most punctual flight time for Chicago to St. Louis flights?

What day of the week experiences the fewest flight delays on this route?

Which airline has the best punctuality record on Chicago to St. Louis flights?

The best insider tips for Chicago O'Hare Intl Airport to St. Louis flights

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Cheapflights partnered with top experts to bring you the best recommendations for your Chicago O'Hare Intl Airport to St. Louis trip

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Reviews of airlines servicing St. Louis

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to St. Louis from Chicago O'Hare Intl?

How long is the flight from Chicago O'Hare Intl Airport to St. Louis?

What are the cheapest airlines flying from Chicago O'Hare Intl Airport to St. Louis round-trip?

What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to St. Louis one-way?

What are the most reliable airlines from Chicago O'Hare Intl Airport to St. Louis?

What are the cheapest flights from Chicago O'Hare Intl Airport to St. Louis?

Can I find deals for flights from O'Hare Intl to St. Louis that include hotel bookings?

How can I find direct flights from O'Hare Intl to St. Louis?

Can I find deals for business class flights from O'Hare Intl to St. Louis?

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to St. Louis?

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Alternative routes for O'Hare Intl to St. Louis

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Top 3 airlines flying from O'Hare Intl to St. Louis

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Cheapest flights from O'Hare Intl to St. Louis
Explore the most affordable flight options available from O'Hare Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.