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St. Charles

$49+ Cheap flights from Chicago (CHI) to St. Charles, MO

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 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to St. Charles are usually found in August or April, booked 85 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from Chicago to St. Charles

Keep the following information in mind while searching for Chicago to St. Charles flight deals. Data was last updated November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$117
(American Airlines)

One-way from

$49
(Southwest)

Popular in

October

Cheapest in

August

Average price

$318
Provider with most accurate pricing for Chicago (CHI)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Lambert-St Louis flights.
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From Chicago (CHI) to St. Charles
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One-way flight from Chicago (CHI) to St. Charles
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Highest demand for flights based on searches. 6% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Chicago to St. Charles

Cheapest flights from Chicago to St. Charles
Explore the most affordable flight options available from Chicago to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 13, 2025.

This Expedia deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/45:05 amORD - STL
1 stop6h 02mFrontier
Mon 12/810:47 amSTL - ORD
1 stop11h 37mFrontier
Deal found 11/11$120
This Southwest deal was found by Cheapflights users on 11/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/187:20 pmMDW - STL
Nonstop1h 15mSouthwest
Sun 1/185:55 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 11/10$134
This American Airlines deal was found by Cheapflights users on 11/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/187:07 amORD - STL
Nonstop1h 28mAmerican Airlines
Sun 1/1811:05 amSTL - ORD
Nonstop1h 29mAmerican Airlines
Deal found 11/10$134
This Southwest deal was found by Cheapflights users on 11/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/89:05 pmMDW - STL
Nonstop1h 15mSouthwest
Wed 12/101:50 pmSTL - MDW
Nonstop1h 05mSouthwest
Deal found 11/13$144
This American Airlines deal was found by Cheapflights users on 11/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/810:15 pmORD - STL
Nonstop1h 23mAmerican Airlines
Wed 12/105:05 amSTL - ORD
Nonstop1h 30mAmerican Airlines
Deal found 11/13$144
This Kiwi.com deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:00 amORD - STL
1 stop27h 02mFrontier
Mon 11/249:54 pmSTL - ORD
1 stop21h 45mFrontier
Deal found 11/11$156
This Delta deal was found by Cheapflights users on 11/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:00 amMDW - STL
1 stop4h 45mDelta
Thu 1/16:05 amSTL - MDW
1 stop5h 01mDelta
Deal found 11/10$157
This Delta deal was found by Cheapflights users on 11/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:35 pmORD - STL
1 stop7h 06mDelta
Tue 1/1312:00 pmSTL - ORD
1 stop4h 43mDelta
Deal found 11/13$157
This eDestinos deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:39 pmORD - STL
1 stop21h 01mFrontier
Tue 1/135:11 pmSTL - ORD
2 stops18h 57mFrontier
Deal found 11/12$158
This Kiwi.com deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:23 pmMDW - STL
1 stop14h 24mFrontier
Sun 12/1410:42 amSTL - MDW
1 stop7h 30mFrontier
Deal found 11/12$163
This Kiwi.com deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2112:12 pmMDW - STL
1 stop21h 50mFrontier
Sun 11/233:14 pmSTL - MDW
1 stop7h 19mFrontier
Deal found 11/12$167
This Kiwi.com deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:00 amORD - STL
1 stop27h 02mFrontier
Sun 11/2310:24 amSTL - ORD
1 stop7h 35mFrontier
Deal found 11/12$167

Cheapflights Fare Finder

 
Customize your flight search to find flights from Chicago to St. Charles that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 13, 2025.
Use the filters below to find and compare flights from Chicago to St. Charles that are best for you.

Fly from

Chicago

Fly to

St. Charles

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

Wed 4/1

2:40 pm-7:55 pm

1 stop5h 15m

Lambert-St Louis

Wed 4/8

6:35 am-3:00 pm

1 stop8h 25m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 12/30

10:12 am-10:33 pm

1 stop12h 21m

Lambert-St Louis

Thu 1/1

10:42 am-10:24 pm

1 stop11h 42m

$156

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Wed 12/17

5:29 pm-9:57 pm

1 stop4h 28m

Lambert-St Louis

Thu 1/1

6:05 am-11:06 am

1 stop5h 01m

$157

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Wed 12/17

10:49 am-4:21 pm

1 stop5h 32m

Lambert-St Louis

Wed 12/31

6:05 am-11:06 am

1 stop5h 01m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 12/31

1:35 pm-8:41 pm

1 stop7h 06m

Lambert-St Louis

Tue 1/13

12:00 pm-7:35 pm

1 stop7h 35m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 3/31

7:00 pm-11:10 pm

1 stop4h 10m

Lambert-St Louis

Tue 4/7

5:30 pm-9:56 pm

1 stop4h 26m

$157

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Mon 12/8

10:05 am-4:05 pm

1 stop6h 00m

Lambert-St Louis

Wed 12/10

12:00 pm-5:10 pm

1 stop5h 10m

$164

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 2/9

1:45 pm-8:10 pm

1 stop6h 25m

Lambert-St Louis

Wed 2/11

8:15 am-12:15 pm

1 stop4h 00m

$164

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Mon 2/23

1:25 pm-7:30 pm

1 stop6h 05m

Lambert-St Louis

Tue 2/24

6:50 am-1:55 pm

2 stops7h 05m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 39 results
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Best time to book a flight from Chicago to St. Charles

Have a flexible travel schedule? Discover the best time to fly to St. Charles from Chicago 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 to St. Charles

How far ahead should I book a flight from Chicago to St. Charles?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to St. Charles. Price data was last updated on November 7, 2025.

Booking 84 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago to St. Charles. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Chicago to St. Charles?

Currently, August is the cheapest month in which you can book a flight from Chicago to St. Charles (average of $77). Flying from Chicago to St. Charles in July is currently the most expensive (average of $211). 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 CHI to CH5?

Find hourly flight availability from Chicago to St. Charles. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

One of the essential ways to save on airfare from Chicago to St. Charles is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 23% on airfare.

What is the cheapest day to fly from Chicago to St. Charles?

Use this chart to determine the cheapest time to fly round-trip from Chicago to St. Charles. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Chicago to St. Charles flight should consider departing on Friday afternoons 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.

Weekly flight availability from Chicago to St. Charles

Explore weekly flight availability from Chicago to St. Charles. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 13, 2025.

The most flights from CHI to CH5 are scheduled on a Thursday (64 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost to fly round-trip from Chicago to St. Charles?

Reviews of airlines servicing St. Charles

Get insights into the airlines that provide service to St. Charles. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Charles. Reviews last updated November 13, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American Airlines from Chicago to St. Charles. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
9,017 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,051 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southern / Mokulele
6.4
Okay
27 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

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

  • How long is the flight from Chicago to St. Charles?

    Southwest, Frontier, and Delta can get you from Chicago to St. Charles in just under 1h 10m. Your travel time can differ by up to 11h 11m. Airlines will cover a distance of 251 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Chicago to St. Charles one-way?

    The cheapest airlines for a one-way flight from Chicago to St. Charles are Southwest ($49), United Airlines ($59), and Frontier ($66).

  • What are the most reliable airlines from Chicago to St. Charles?

    Consider Envoy Air (92%), Turkish Airlines (90%) or United Airlines (89%) when booking your flight. These represent the most reliable airlines when flying from Chicago to St. Charles.

  • What are the cheapest flights from Chicago to St. Charles?

    On average you can expect to pay $283 for a flight from Chicago to St. Charles. The cheapest flight overall is $63 while the most popular route, (Chicago O'Hare Intl - Lambert-St Louis) is currently priced at $97.

  • Can I find deals for flights from Chicago to St. Charles that include hotel bookings?

    Yes. In addition to deals on Chicago to St. Charles flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to St. Charles?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to St. Charles.

  • Can I find deals for business class flights from Chicago to St. Charles?

    Yes. Cheapflights offers flight deals from Chicago to St. Charles 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 to St. Charles?

    Currently, August is the cheapest month in which you can book a flight from Chicago to St. Charles (average of $77). Flying from Chicago to St. Charles in July is currently the most expensive (average of $211). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Chicago to St. Charles

Discover the top 4 airlines that operate flights from Chicago to St. Charles. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$298FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$115Average$384FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$145Average$214FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$272FlexibilityNo cancel feeOn-time69%

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