$59+ Cheap flights from St. Louis (STL) to Chicago (CHI)
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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CHI
Sep 8 — Sep 151
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Chicago with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Lambert-St Louis to Chicago are usually found in August or September, booked 84 days in advance, depart on a Friday or Thursday and return on a Saturday
Cheap flight deals from St. Louis to Chicago
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to ChicagoExplore the most affordable flight options available from St. Louis to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 9, 2026.
Explore the most affordable flight options available from St. Louis to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 9, 2026.
This Southwest deal was found by Cheapflights users on 8/3. 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 9/55:45 am -
Nonstop1h 05m
Sun 9/68:35 am -
Nonstop1h 20m
Deal found 8/3![Southwest logo]()
$117
This United Airlines deal was found by Cheapflights users on 8/4. 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 9/57:25 am -
Nonstop1h 36m
Sun 9/610:29 am -
Nonstop1h 33m
Deal found 8/4![United Airlines logo]()
$117
This American Airlines deal was found by Cheapflights users on 8/4. 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 9/55:00 am -
Nonstop1h 24m
Sun 9/67:00 am -
Nonstop1h 24m
Deal found 8/4![American Airlines logo]()
$118
This Southwest deal was found by Cheapflights users on 8/6. 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 9/38:50 pm -
Nonstop1h 10m
Sat 9/56:15 pm -
Nonstop1h 20m
Deal found 8/6![Southwest logo]()
$134
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/299:32 am -
Nonstop1h 28m
Sat 9/53:19 pm -
Nonstop1h 24m
Deal found 8/4![American Airlines logo]()
$134
This Frontier deal was found by Cheapflights users on 8/4. 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 9/1010:20 am -
1 stop9h 15m
Sat 9/126:30 am -
1 stop12h 47m
Deal found 8/4![Frontier logo]()
$142
This Frontier deal was found by Cheapflights users on 8/7. 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.
Sat 10/1010:35 am -
1 stop9h 53m
Wed 10/1411:06 am -
1 stop8h 09m
Deal found 8/7![Frontier logo]()
$143
This Southwest deal was found by Cheapflights users on 8/6. 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 9/36:15 pm -
Nonstop1h 05m
Sun 9/611:05 am -
1 stop4h 50m
Deal found 8/6![Southwest logo]()
$144
This Frontier deal was found by Cheapflights users on 8/3. 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 10/1510:35 am -
1 stop9h 53m
Mon 10/196:05 am -
1 stop11h 41m
Deal found 8/3![Frontier logo]()
$147
This Southwest deal was found by Cheapflights users on 8/6. 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 8/272:20 pm -
Nonstop1h 05m
Thu 8/278:55 pm -
Nonstop1h 10m
Deal found 8/6![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 8/6. 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.
Thu 8/277:25 am -
Nonstop1h 36m
Thu 8/279:30 pm -
Nonstop1h 29m
Deal found 8/6![United Airlines logo]()
$151
This American Airlines deal was found by Cheapflights users on 8/7. 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 9/215:18 pm -
Nonstop1h 55m
Mon 9/288:55 am -
Nonstop1h 23m
Deal found 8/7![American Airlines logo]()
$152
Best flights from St. Louis to ChicagoDiscover carefully curated flight deals from St. Louis to Chicago that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 9, 2026.
Discover carefully curated flight deals from St. Louis to Chicago that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 9, 2026.
This Southwest deal was found by Cheapflights users on 8/7. 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 9/55:45 am -
Nonstop1h 05m
Sun 9/68:10 am -
1 stop5h 35m
Deal found 8/7![Southwest logo]()
$127
This United Airlines deal was found by Cheapflights users on 8/5. 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.
Mon 10/57:01 pm -
Nonstop1h 29m
Mon 10/129:30 pm -
Nonstop1h 29m
Deal found 8/5![United Airlines logo]()
$151
This Delta deal was found by Cheapflights users on 8/8. 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.
Sat 9/55:34 pm -
1 stop4h 13m
Sun 9/66:00 am -
1 stop4h 23m
Deal found 8/8![Delta logo]()
$157
This Southwest deal was found by Cheapflights users on 8/7. 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.
Tue 10/205:50 am -
Nonstop1h 05m
Wed 10/218:50 pm -
Nonstop1h 10m
Deal found 8/7![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Tue 11/310:53 am -
Nonstop1h 36m
Tue 11/39:00 pm -
Nonstop1h 24m
Deal found 8/7![United Airlines logo]()
$151
This Delta deal was found by Cheapflights users on 8/6. 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.
Sat 9/55:34 pm -
1 stop4h 13m
Sat 9/126:10 am -
1 stop4h 24m
Deal found 8/6![Delta logo]()
$164
This Southwest deal was found by Cheapflights users on 8/4. 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.
Wed 8/266:30 am -
Nonstop1h 05m
Thu 8/273:10 pm -
Nonstop1h 10m
Deal found 8/4![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 8/6. 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.
Thu 9/105:30 pm -
Nonstop1h 31m
Sat 9/129:30 pm -
Nonstop1h 29m
Deal found 8/6![United Airlines logo]()
$151
This Southwest deal was found by Cheapflights users on 8/7. 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.
Tue 10/2010:55 am -
Nonstop1h 10m
Thu 10/2210:05 pm -
Nonstop1h 10m
Deal found 8/7![Southwest logo]()
$151
This Delta deal was found by Cheapflights users on 8/5. 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 8/266:30 am -
1 stop4h 12m
Wed 9/21:59 pm -
1 stop6h 43m
Deal found 8/5![Delta logo]()
$171
This Delta deal was found by Cheapflights users on 8/7. 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 9/231:55 pm -
1 stop6h 35m
Thu 9/241:55 pm -
1 stop6h 40m
Deal found 8/7![Delta logo]()
$171
This Southwest deal was found by Cheapflights users on 8/7. 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.
Wed 9/2310:15 am -
1 stop5h 10m
Thu 9/248:55 pm -
Nonstop1h 15m
Deal found 8/7![Southwest logo]()
$161
This United Airlines deal was found by Cheapflights users on 8/8. 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 9/58:30 am -
Nonstop1h 36m
Sun 9/69:30 pm -
Nonstop1h 29m
Deal found 8/8![United Airlines logo]()
$188
This Southwest deal was found by Cheapflights users on 8/6. 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 9/38:50 pm -
Nonstop1h 10m
Thu 9/107:25 am -
1 stop5h 45m
Deal found 8/6![Southwest logo]()
$161
This Southwest deal was found by Cheapflights users on 8/4. 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 9/198:30 am -
1 stop5h 20m
Mon 9/217:55 am -
Nonstop1h 20m
Deal found 8/4![Southwest logo]()
$161
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Thu 10/158:00 am -
Nonstop1h 31m
Mon 10/197:50 pm -
Nonstop1h 31m
Deal found 8/7![United Airlines logo]()
$221
This KAYAK deal was found by Cheapflights users on 8/7. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:40 am -
1 stop3h 57m
Wed 9/308:25 am -
1 stop6h 47m
Deal found 8/7![Delta logo]()
$226
This Southwest deal was found by Cheapflights users on 8/3. 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 10/25:25 am -
Nonstop1h 05m
Tue 10/68:05 am -
Nonstop1h 10m
Deal found 8/3![Southwest logo]()
$200
Last-minute flights from St. Louis to ChicagoDiscover last-minute flight deals from St. Louis to Chicago. Data last updated August 9, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Chicago. Data last updated August 9, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 8/6. 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 8/272:20 pm -
Nonstop1h 05m
Thu 8/278:55 pm -
Nonstop1h 10m
Deal found 8/6![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 8/6. 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.
Thu 8/277:25 am -
Nonstop1h 36m
Thu 8/279:30 pm -
Nonstop1h 29m
Deal found 8/6![United Airlines logo]()
$151
This Frontier deal was found by Cheapflights users on 8/4. 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.
Fri 8/284:23 pm -
1 stop6h 45m
Mon 8/317:05 am -
1 stop10h 17m
Deal found 8/4![Frontier logo]()
$156
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/299:32 am -
Nonstop1h 28m
Sat 9/53:19 pm -
Nonstop1h 24m
Deal found 8/4![American Airlines logo]()
$134
This Southwest deal was found by Cheapflights users on 8/6. 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 9/38:50 pm -
Nonstop1h 10m
Sat 9/56:15 pm -
Nonstop1h 20m
Deal found 8/6![Southwest logo]()
$134
This Southwest deal was found by Cheapflights users on 8/6. 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 9/36:15 pm -
Nonstop1h 05m
Sun 9/611:05 am -
1 stop4h 50m
Deal found 8/6![Southwest logo]()
$144
This Southwest deal was found by Cheapflights users on 8/3. 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 9/55:45 am -
Nonstop1h 05m
Sun 9/68:35 am -
Nonstop1h 20m
Deal found 8/3![Southwest logo]()
$117
This United Airlines deal was found by Cheapflights users on 8/4. 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 9/57:25 am -
Nonstop1h 36m
Sun 9/610:29 am -
Nonstop1h 33m
Deal found 8/4![United Airlines logo]()
$117
This American Airlines deal was found by Cheapflights users on 8/4. 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 9/55:00 am -
Nonstop1h 24m
Sun 9/67:00 am -
Nonstop1h 24m
Deal found 8/4![American Airlines logo]()
$118
This Southwest deal was found by Cheapflights users on 8/6. 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 9/510:15 am -
1 stop6h 25m
Sat 9/125:55 am -
1 stop4h 55m
Deal found 8/6![Southwest logo]()
$154
This Frontier deal was found by Cheapflights users on 8/4. 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 9/1010:20 am -
1 stop9h 15m
Sat 9/126:30 am -
1 stop12h 47m
Deal found 8/4![Frontier logo]()
$142
This American Airlines deal was found by Cheapflights users on 8/7. 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 9/215:18 pm -
Nonstop1h 55m
Mon 9/288:55 am -
Nonstop1h 23m
Deal found 8/7![American Airlines logo]()
$152
One-way flights from St. Louis to ChicagoSearch for one-way flight options from St. Louis to Chicago. Find affordable one-way fares based on user searches. Data last updated August 9, 2026.
Search for one-way flight options from St. Louis to Chicago. Find affordable one-way fares based on user searches. Data last updated August 9, 2026.
This Southwest deal was found by Cheapflights users on 8/7. 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.
Sun 9/67:50 pm -
Nonstop1h 05m
Deal found 8/7![Southwest logo]()
$59
This United Airlines deal was found by Cheapflights users on 8/6. 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 9/58:00 am -
Nonstop1h 34m
Deal found 8/6![United Airlines logo]()
$59
This Southwest deal was found by Cheapflights users on 8/4. 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 9/52:15 pm -
1 stop4h 55m
Deal found 8/4![Southwest logo]()
$69
This Southwest deal was found by Cheapflights users on 8/7. 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 9/286:15 pm -
Nonstop1h 05m
Deal found 8/7![Southwest logo]()
$76
This United Airlines deal was found by Cheapflights users on 8/6. 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.
Thu 10/16:00 am -
Nonstop1h 36m
Deal found 8/6![United Airlines logo]()
$76
This Frontier deal was found by Cheapflights users on 8/4. 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.
Mon 10/52:29 pm -
1 stop9h 15m
Deal found 8/4![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 8/4. 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 10/110:20 am -
1 stop9h 15m
Deal found 8/4![Frontier logo]()
$77
This American Airlines deal was found by Cheapflights users on 8/4. 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.
Wed 10/147:29 am -
Nonstop1h 31m
Deal found 8/4![American Airlines logo]()
$78
This Delta deal was found by Cheapflights users on 8/3. 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.
Sun 9/610:33 am -
1 stop6h 26m
Deal found 8/3![Delta logo]()
$79
This Delta deal was found by Cheapflights users on 8/7. 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.
Sat 9/55:34 pm -
1 stop4h 13m
Deal found 8/7![Delta logo]()
$79
This Super.com deal was found by Cheapflights users on 8/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:10 pm -
1 stop28h 13m
Deal found 8/6![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 8/7. 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.
Wed 10/2110:35 am -
1 stop11h 23m
Deal found 8/7![Frontier logo]()
$82
Find flight deals from St. Louis to Chicago
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $117 (Southwest) |
One-way from | $59 (Southwest) |
Popular in | January |
Cheapest in | August |
Average price | $239 |
Good round-trip deal | $317 or less |
Good one-way deal | $184 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Chicago 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 August 9, 2026.
Use the filters below to find and compare flights from St. Louis to Chicago that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Sat 9/5
5:45 am-6:50 am
Nonstop1h 05m
Chicago Midway
Sun 9/6
8:10 am-1:45 pm
1 stop5h 35m
$127
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Mon 10/5
7:01 pm-8:30 pm
Nonstop1h 29m
Chicago O'Hare Intl
Mon 10/12
9:30 pm-10:59 pm
Nonstop1h 29m
$151
Quickest round-trip
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Tue 10/20
5:50 am-6:55 am
Nonstop1h 05m
Chicago Midway
Wed 10/21
8:50 pm-10:00 pm
Nonstop1h 10m
$151
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Tue 11/3
10:53 am-12:29 pm
Nonstop1h 36m
Chicago O'Hare Intl
Tue 11/3
9:00 pm-10:24 pm
Nonstop1h 24m
$151
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Wed 8/26
6:30 am-7:35 am
Nonstop1h 05m
Chicago Midway
Thu 8/27
3:10 pm-4:20 pm
Nonstop1h 10m
$151
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Thu 9/10
5:30 pm-7:01 pm
Nonstop1h 31m
Chicago O'Hare Intl
Sat 9/12
9:30 pm-10:59 pm
Nonstop1h 29m
$151
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Tue 10/20
10:55 am-12:05 pm
Nonstop1h 10m
Chicago Midway
Thu 10/22
10:05 pm-11:15 pm
Nonstop1h 10m
$151
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Sat 9/5
5:34 pm-9:47 pm
1 stop4h 13m
Chicago O'Hare Intl
Sun 9/6
6:00 am-10:23 am
1 stop4h 23m
$157
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Wed 9/23
10:15 am-3:25 pm
1 stop5h 10m
Chicago Midway
Thu 9/24
8:55 pm-10:10 pm
Nonstop1h 15m
$161
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Thu 9/3
8:50 pm-10:00 pm
Nonstop1h 10m
Chicago Midway
Thu 9/10
7:25 am-1:10 pm
1 stop5h 45m
$161
Showing 1-10 of 41 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Chicago
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Chicago in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on St. Louis-Chicago flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Chicago flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Chicago flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Chicago flights, Cheapflights users trust FlightHub the most. FlightHub 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 St. Louis-Chicago 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 St. Louis to Chicago
Have a flexible travel schedule? Discover the best time to fly to Chicago from St. Louis with our price prediction graph.
STL-CHI
STL-MDW
STL-ORD
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 St. Louis to Chicago
STL-CHI
STL-MDW
STL-ORD
What is the cheapest month to book a flight from St. Louis to Chicago?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Chicago (average of $287). Flying from St. Louis to Chicago in July is currently the most expensive (average of $451). 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 STL to CHI?
Find hourly flight availability from St. Louis to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 9, 2026.
It’s optimal to fly from St. Louis to Chicago in the morning. By choosing this option you can save up to 31% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from St. Louis to Chicago
Explore weekly flight availability from St. Louis to Chicago. 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 August 9, 2026.
The most flights from STL to CHI are scheduled on a Friday (78 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (24 on average).
How much does it cost to fly round-trip from St. Louis to Chicago?
Airfare is below average for this route at the moment.
St. Louis to Chicago flights typically cost between $177 and $361 in September.The cheapest round-trip price found within the last 5 days was $117 on Southwest (Sep 5-Sep 6).
How far ahead should I book a flight from St. Louis to Chicago?
The price you pay for your flight from St. Louis to Chicago may vary depending on when you book. For the best chance of a lower fare, look to book 69 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from St. Louis to Chicago?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Chicago. Price data was last updated on August 1, 2026.
Travelers seeking maximum savings on their St. Louis to Chicago flight should consider departing on Tuesday at noon when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for St. Louis to Chicago flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Chicago trip
Our travel experts
Reviews of airlines servicing Chicago
Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated August 9, 2026.
Read through reviews of airlines operating flights from St. Louis to Chicago, such as Southwest,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Chicago. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Chicago?
Book flights to Chicago if you plan to visit one of these locationsBenton Harbor
Lansing
Merrillville
Valparaiso
Hammond
Saint Joseph
Porter
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Other flights to Chicago
Explore flights to Chicago departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 9, 2026.
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St. Louis and Chicago flights
Browse other St. Louis and Chicago flight options. Last updated on August 9, 2026.
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Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on August 9, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Top 3 airlines flying from St. Louis to Chicago
Discover the top 3 airlines that operate flights from St. Louis to Chicago. 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 August 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$320 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$117 | Average$416 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$181 | Average$492 | FlexibilityNo cancel fee | On-time63% |