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St. Charles

$46+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to St. Charles are usually found in September or August, booked 78 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 July 28, 2025.

Round-trip from

$90
(American Airlines)

One-way from

$46
(Southwest)

Popular in

July

Cheapest in

September

Average price

$361
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. 1% potential increase in price ($2 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 28, 2025.

This American Airlines deal was found by Cheapflights users on 7/26. 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.
Sat 9/207:10 pmORD - STL
Nonstop1h 22mAmerican Airlines
Sat 10/47:23 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Deal found 7/26$90
This Southwest deal was found by Cheapflights users on 7/28. 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.
Sat 9/206:35 amMDW - STL
Nonstop1h 10mSouthwest
Sat 10/45:55 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 7/28$91
This United Airlines deal was found by Cheapflights users on 7/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/232:20 pmORD - STL
Nonstop1h 24mUnited Airlines
Sat 8/305:30 pmSTL - ORD
Nonstop1h 25mUnited Airlines
Deal found 7/26$91
This Southwest deal was found by Cheapflights users on 7/26. 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.
Fri 8/222:55 pmORD - STL
1 stop4h 15mSouthwest
Mon 8/255:30 amSTL - ORD
1 stop7h 15mSouthwest
Deal found 7/26$134
This Kissandfly.com deal was found by Cheapflights users on 7/26. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/166:55 amORD - STL
Nonstop1h 25mSouthern / Mokulele
Sun 8/175:15 pmSTL - ORD
1 stop3h 37mSouthern / Mokulele
Deal found 7/26$136
This eDestinos deal was found by Cheapflights users on 7/26. 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.
Tue 9/97:20 amORD - STL
1 stop25h 46mFrontier
Tue 9/167:55 pmSTL - ORD
1 stop25h 33mFrontier
Deal found 7/26$161
This Delta deal was found by Cheapflights users on 7/26. 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 9/94:25 pmMDW - STL
1 stop5h 37mDelta
Tue 9/166:40 amSTL - MDW
1 stop5h 48mDelta
Deal found 7/26$177
This Delta deal was found by Cheapflights users on 7/28. 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 8/261:30 pmORD - STL
1 stop5h 37mDelta
Sun 8/315:11 pmSTL - ORD
1 stop6h 45mDelta
Deal found 7/28$177
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/76:20 amMDW - STL
1 stop7h 14mFrontier
Sat 8/92:52 pmSTL - MDW
1 stop7h 41mFrontier
Deal found 7/25$188
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/111:10 pmORD - STL
1 stop3h 35mMultiple Airlines
Tue 8/125:40 pmSTL - ORD
1 stop16h 34mMultiple Airlines
Deal found 7/27$206

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 July 28, 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

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 9/20

7:10 pm-8:32 pm

Nonstop1h 22m

Lambert-St Louis

Sat 10/4

7:23 am-8:45 am

Nonstop1h 22m

$90

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 9/20

6:35 am-7:45 am

Nonstop1h 10m

Lambert-St Louis

Sat 10/4

5:55 pm-7:05 pm

Nonstop1h 10m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 8/23

2:20 pm-3:44 pm

Nonstop1h 24m

Lambert-St Louis

Sat 8/30

5:30 pm-6:55 pm

Nonstop1h 25m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 8/22

2:55 pm-7:10 pm

1 stop4h 15m

Lambert-St Louis

Mon 8/25

5:30 am-12:45 pm

1 stop7h 15m

$134

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 8/16

6:55 am-8:20 am

Nonstop1h 25m

Lambert-St Louis

Sun 8/17

5:15 pm-8:52 pm

1 stop3h 37m

$136

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 9/9

7:20 am-9:06 am

1 stop25h 46m

Lambert-St Louis

Tue 9/16

7:55 pm-9:28 pm

1 stop25h 33m

$161

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Tue 9/9

4:25 pm-10:02 pm

1 stop5h 37m

Lambert-St Louis

Tue 9/16

6:40 am-12:28 pm

1 stop5h 48m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 8/26

1:30 pm-7:07 pm

1 stop5h 37m

Lambert-St Louis

Sun 8/31

5:11 pm-11:56 pm

1 stop6h 45m

$177

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 8/7

6:20 am-1:34 pm

1 stop7h 14m

Lambert-St Louis

Sat 8/9

2:52 pm-10:33 pm

1 stop7h 41m

$188

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 9/11

8:15 am-4:35 pm

1 stop8h 20m

Lambert-St Louis

Thu 9/18

7:04 pm-8:36 pm

Nonstop1h 32m

$200

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 22 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 July 25, 2025.

Booking 76 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 $311). Flying from Chicago to St. Charles in March is currently the most expensive (average of $356). 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 July 28, 2025.

When flying from Chicago to St. Charles, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 Wednesday evenings when fares are most often at their lowest. Monday mornings 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 July 28, 2025.

The most flights from CHI to CH5 are scheduled on a Sunday (77 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (61 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 July 28, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United 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
4,237 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,971 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,893 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,237 reviews

Overall

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

  • 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 ($46), American Airlines ($46), and Southern / Mokulele ($85).

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

    Consider Republic Airways (88%), Envoy Air (88%) or SkyWest Airlines (83%) 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 $229 for a flight from Chicago to St. Charles. The cheapest flight overall is $45 while the most popular route, (Chicago O'Hare Intl - Lambert-St Louis) is currently priced at $137.

  • 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 $311). Flying from Chicago to St. Charles in March is currently the most expensive (average of $356). 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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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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$328FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$115Average$379FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$213FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$322FlexibilityNo cancel feeOn-time69%

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