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St. Charles

$73+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
may. 6 — may. 131
mar. 5/6
mar. 5/13
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to St. Charles are usually found in May or September, booked 84 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 mayo 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$140
(Southern / Mokulele)

One-way from

$73
(Southern / Mokulele)

Popular in

March

Cheapest in

May

Average price

$233
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. 4% potential increase in price ($13 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in May 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 mayo 1, 2025.

This Southern / Mokulele deal was found by Cheapflights users on 4/30. 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 Southern / Mokulele is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/298:25 amORD - STL
1 stop11h 45mSouthern / Mokulele
jue. 6/55:15 pmSTL - ORD
1 stop14h 25mSouthern / Mokulele
Deal found 4/30$140
This Frontier deal was found by Cheapflights users on 4/30. 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.
sáb. 6/146:20 amMDW - STL
1 stop7h 47mFrontier
sáb. 6/212:52 pmSTL - MDW
1 stop7h 36mFrontier
Deal found 4/30$161
This Frontier deal was found by Cheapflights users on 4/30. 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.
mié. 5/285:03 pmORD - STL
1 stop6h 41mFrontier
mié. 6/45:45 pmSTL - ORD
1 stop6h 51mFrontier
Deal found 4/30$162
This CheapOair deal was found by Cheapflights users on 4/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/174:15 pmORD - STL
1 stop7h 51mMultiple Airlines
lun. 5/191:00 pmSTL - ORD
1 stop3h 32mMultiple Airlines
Deal found 4/30$190
This Southwest deal was found by Cheapflights users on 4/30. 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.
sáb. 5/246:35 amMDW - STL
Nonstop1h 10mSouthwest
dom. 5/257:00 amSTL - MDW
Nonstop1h 05mSouthwest
Deal found 4/30$217
This American Airlines deal was found by Cheapflights users on 4/30. 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.
sáb. 5/2411:47 amORD - STL
Nonstop1h 20mAmerican Airlines
dom. 5/257:30 amSTL - ORD
Nonstop1h 19mAmerican Airlines
Deal found 4/30$218
This Delta deal was found by Cheapflights users on 4/30. 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.
sáb. 5/245:55 pmMDW - STL
1 stop3h 36mDelta
dom. 5/256:00 amSTL - MDW
1 stop5h 53mDelta
Deal found 4/30$237
This Delta deal was found by Cheapflights users on 4/30. 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.
sáb. 5/241:45 pmORD - STL
2 stops9h 41mDelta
mar. 5/275:40 pmSTL - ORD
1 stop6h 18mDelta
Deal found 4/30$242
This United Airlines deal was found by Cheapflights users on 4/30. 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.
jue. 6/1210:54 amORD - STL
Nonstop1h 26mUnited Airlines
lun. 6/165:00 amSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 4/30$263
This Southwest deal was found by Cheapflights users on 4/30. 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.
vie. 5/301:30 pmORD - STL
2 stops7h 15mSouthwest
dom. 6/16:40 amSTL - ORD
1 stop5h 10mSouthwest
Deal found 4/30$315
This Mytrip deal was found by Cheapflights users on 4/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/1210:43 amORD - STL
3 stops30h 21mSpirit Airlines
dom. 6/156:36 pmSTL - ORD
2 stops15h 02mSpirit Airlines
Deal found 4/30$316

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 mayo 1, 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

jue. 5/29

8:25 am-8:10 pm

1 stop11h 45m

Lambert-St Louis

mar. 6/3

12:15 pm-3:50 pm

1 stop3h 35m

$140

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

sáb. 6/14

6:20 am-2:07 pm

1 stop7h 47m

Lambert-St Louis

sáb. 6/21

2:52 pm-10:28 pm

1 stop7h 36m

$161

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mié. 5/28

5:03 pm-11:44 pm

1 stop6h 41m

Lambert-St Louis

mié. 6/4

5:45 pm-12:36 am

1 stop6h 51m

$162

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 5/17

4:15 pm-12:06 am

1 stop7h 51m

Lambert-St Louis

lun. 5/19

1:00 pm-4:32 pm

1 stop3h 32m

$190

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

mié. 5/21

5:40 pm-6:55 pm

Nonstop1h 15m

Lambert-St Louis

mar. 5/27

8:05 pm-9:10 pm

Nonstop1h 05m

$217

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 5/24

11:47 am-1:07 pm

Nonstop1h 20m

Lambert-St Louis

dom. 5/25

7:30 am-8:49 am

Nonstop1h 19m

$218

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

mié. 5/21

9:20 am-3:00 pm

1 stop5h 40m

Lambert-St Louis

mar. 5/27

6:00 am-12:28 pm

2 stops6h 28m

$242

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 5/24

1:45 pm-11:26 pm

2 stops9h 41m

Lambert-St Louis

mar. 5/27

5:40 pm-11:58 pm

1 stop6h 18m

$242

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

jue. 6/12

10:54 am-12:20 pm

Nonstop1h 26m

Lambert-St Louis

lun. 6/16

5:00 am-6:30 am

Nonstop1h 30m

$263

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

vie. 5/30

1:30 pm-8:45 pm

2 stops7h 15m

Lambert-St Louis

dom. 6/1

6:40 am-11:50 am

1 stop5h 10m

$315

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 23 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 April 25, 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 $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 mayo 1, 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 Saturday 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 mayo 1, 2025.

The most flights from CHI to CH5 are scheduled on a Wednesday (65 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).

Rainfall in St. Charles by month

Plan your trip to St. Charles by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Charles 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. Charles when rainfall is around 2.2 in.

Temperature in St. Charles by month

Plan your trip to St. Charles by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Charles, 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).

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 mayo 1, 2025.
Read through reviews of airlines operating flights from Chicago to St. Charles, such as Southwest, Delta and United Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,294 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.6

Crew

8.6

Comfort

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
Southwest
8.0
Very good
4,294 reviews
Southwest
8.0
Very good
4,294 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.6

Crew

8.6

Comfort

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
Delta
8.0
Very good
7,934 reviews
Southwest
8.0
Very good
4,294 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.6

Crew

8.6

Comfort

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
United Airlines
7.4
Good
8,696 reviews
Southwest
8.0
Very good
4,294 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.6

Crew

8.6

Comfort

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,294 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.6

Crew

8.6

Comfort

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

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 Southern / Mokulele ($73), Frontier ($81), and Southwest ($109).

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

    Consider Republic Airways (84%), Turkish Airlines (83%) or Alaska Airlines (82%) 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 $342 for a flight from Chicago to St. Charles. The cheapest flight overall is $48 while the most popular route, (Chicago O'Hare Intl - Lambert-St Louis) is currently priced at $140.

  • 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 mayo 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$363FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$328FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$176FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$141Average$319FlexibilityNo cancel feeOn-time69%

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