$59+ Cheap flights from St. Louis (STL) to O'Hare Intl (ORD)
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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Oct 3 — Oct 101
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to O'Hare Intl 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 O'Hare Intl are usually found in December or October, booked 37 days in advance, depart on a Friday or Thursday and return on a Saturday
Cheap flight deals from St. Louis to O'Hare Intl
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to O'Hare IntlExplore the most affordable flight options available from St. Louis to O'Hare Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 3, 2026.
Explore the most affordable flight options available from St. Louis to O'Hare Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 3, 2026.
This American Airlines deal was found by Cheapflights users on 9/2. 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 10/17:27 am -
Nonstop1h 38m
Tue 10/1311:00 pm -
Nonstop1h 19m
Deal found 9/2![American Airlines logo]()
$117
This Expedia deal was found by Cheapflights users on 9/1. 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.
Wed 10/144:19 pm -
1 stop8h 05m
Wed 10/216:00 am -
1 stop11h 40m
Deal found 9/1![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 9/2. 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 9/2412:27 pm -
1 stop17h 11m
Mon 9/288:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 9/2. 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 9/308:10 pm -
1 stop28h 13m
Wed 10/76:20 am -
1 stop6h 50m
Deal found 9/2![Frontier logo]()
$124
This American Airlines deal was found by Cheapflights users on 9/2. 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.
Fri 9/257:21 am -
Nonstop1h 38m
Mon 9/288:55 am -
Nonstop1h 23m
Deal found 9/2![American Airlines logo]()
$134
This Frontier deal was found by Cheapflights users on 9/2. 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
Fri 10/28:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$135
This CheapOair deal was found by Cheapflights users on 9/2. 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.
Fri 9/2512:17 pm -
1 stop17h 21m
Mon 9/288:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$145
This Expedia deal was found by Cheapflights users on 9/2. 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 10/155:53 pm -
1 stop6h 33m
Mon 10/196:20 am -
1 stop10h 38m
Deal found 9/2![Frontier logo]()
$150
This American Airlines deal was found by Cheapflights users on 9/2. 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.
Fri 11/135:01 am -
Nonstop1h 29m
Fri 11/133:20 pm -
Nonstop1h 23m
Deal found 9/2![American Airlines logo]()
$151
This American Airlines deal was found by Cheapflights users on 9/1. 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.
Fri 10/1611:31 am -
Nonstop1h 28m
Fri 10/2311:00 pm -
Nonstop1h 19m
Deal found 9/1![American Airlines logo]()
$152
This Frontier deal was found by Cheapflights users on 9/1. 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 10/165:53 pm -
1 stop6h 38m
Fri 10/236:20 am -
1 stop10h 38m
Deal found 9/1![Frontier logo]()
$153
This Delta deal was found by Cheapflights users on 9/2. 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.
Thu 12/102:17 pm -
1 stop5h 58m
Wed 1/139:30 am -
1 stop5h 01m
Deal found 9/2![Delta logo]()
$157
Best flights from St. Louis to O'Hare IntlDiscover carefully curated flight deals from St. Louis to O'Hare Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 3, 2026.
Discover carefully curated flight deals from St. Louis to O'Hare Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 3, 2026.
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Wed 9/308:00 am -
Nonstop1h 31m
Wed 10/79:30 pm -
Nonstop1h 29m
Deal found 9/2![United Airlines logo]()
$117
This Delta deal was found by Cheapflights users on 9/1. 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 10/36:40 am -
1 stop3h 57m
Tue 10/67:00 am -
1 stop6h 53m
Deal found 9/1![Delta logo]()
$157
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Fri 10/98:00 am -
Nonstop1h 31m
Sat 10/107:50 pm -
Nonstop1h 31m
Deal found 9/2![United Airlines logo]()
$134
This Delta deal was found by Cheapflights users on 9/2. 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.
Thu 9/246:40 am -
1 stop6h 19m
Mon 9/285:50 pm -
1 stop5h 26m
Deal found 9/2![Delta logo]()
$164
This Delta deal was found by Cheapflights users on 9/1. 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.
Thu 12/176:32 am -
1 stop4h 27m
Mon 12/211:26 pm -
1 stop4h 00m
Deal found 9/1![Delta logo]()
$198
This United Airlines deal was found by Cheapflights users on 8/29. 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 9/196:53 pm -
Nonstop1h 36m
Wed 9/2310:25 am -
Nonstop1h 32m
Deal found 8/29![United Airlines logo]()
$259
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Fri 10/235:36 pm -
Nonstop1h 29m
Sun 10/258:10 pm -
Nonstop1h 30m
Deal found 9/2![United Airlines logo]()
$259
This Delta deal was found by Cheapflights users on 8/31. 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.
Thu 12/102:17 pm -
1 stop5h 58m
Wed 1/139:30 am -
1 stop5h 01m
Deal found 8/31![Delta logo]()
$279
This Delta deal was found by Cheapflights users on 8/29. 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.
Fri 12/43:32 pm -
1 stop4h 11m
Fri 12/112:44 pm -
1 stop5h 48m
Deal found 8/29![Delta logo]()
$279
This Delta deal was found by Cheapflights users on 8/30. 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.
Tue 9/2211:21 am -
1 stop5h 38m
Wed 9/231:55 pm -
1 stop6h 40m
Deal found 8/30![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 9/1. 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 10/108:00 am -
Nonstop1h 31m
Sun 10/117:50 pm -
Nonstop1h 31m
Deal found 9/1![United Airlines logo]()
$312
This Delta deal was found by Cheapflights users on 8/31. 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 9/2911:21 am -
1 stop5h 38m
Fri 10/21:55 pm -
1 stop6h 40m
Deal found 8/31![Delta logo]()
$279
Last-minute flights from St. Louis to O'Hare IntlDiscover last-minute flight deals from St. Louis to O'Hare Intl. Data last updated September 3, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to O'Hare Intl. Data last updated September 3, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 9/2. 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 9/2412:27 pm -
1 stop17h 11m
Mon 9/288:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$119
This American Airlines deal was found by Cheapflights users on 9/2. 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.
Fri 9/257:21 am -
Nonstop1h 38m
Mon 9/288:55 am -
Nonstop1h 23m
Deal found 9/2![American Airlines logo]()
$134
This CheapOair deal was found by Cheapflights users on 9/2. 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.
Fri 9/2512:17 pm -
1 stop17h 21m
Mon 9/288:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$145
This Delta deal was found by Cheapflights users on 9/2. 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 9/266:40 am -
1 stop3h 57m
Sat 9/266:24 pm -
1 stop4h 52m
Deal found 9/2![Delta logo]()
$157
This CheapOair deal was found by Cheapflights users on 9/2. 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.
Sat 9/2612:17 pm -
1 stop17h 21m
Mon 9/288:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$160
This Super.com deal was found by Cheapflights users on 9/2. 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 9/308:10 pm -
1 stop28h 13m
Wed 10/76:20 am -
1 stop6h 50m
Deal found 9/2![Frontier logo]()
$124
This American Airlines deal was found by Cheapflights users on 9/2. 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 10/17:27 am -
Nonstop1h 38m
Tue 10/1311:00 pm -
Nonstop1h 19m
Deal found 9/2![American Airlines logo]()
$117
This Frontier deal was found by Cheapflights users on 9/2. 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
Fri 10/28:55 pm -
1 stop14h 37m
Deal found 9/2![Frontier logo]()
$135
This Expedia deal was found by Cheapflights users on 9/1. 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.
Wed 10/144:19 pm -
1 stop8h 05m
Wed 10/216:00 am -
1 stop11h 40m
Deal found 9/1![Frontier logo]()
$118
This Expedia deal was found by Cheapflights users on 9/2. 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 10/155:53 pm -
1 stop6h 33m
Mon 10/196:20 am -
1 stop10h 38m
Deal found 9/2![Frontier logo]()
$150
This American Airlines deal was found by Cheapflights users on 9/1. 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.
Fri 10/1611:31 am -
Nonstop1h 28m
Fri 10/2311:00 pm -
Nonstop1h 19m
Deal found 9/1![American Airlines logo]()
$152
This Frontier deal was found by Cheapflights users on 9/1. 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 10/165:53 pm -
1 stop6h 38m
Fri 10/236:20 am -
1 stop10h 38m
Deal found 9/1![Frontier logo]()
$153
One-way flights from St. Louis to O'Hare IntlSearch for one-way flight options from St. Louis to O'Hare Intl. Find affordable one-way fares based on user searches. Data last updated September 3, 2026.
Search for one-way flight options from St. Louis to O'Hare Intl. Find affordable one-way fares based on user searches. Data last updated September 3, 2026.
This United Airlines deal was found by Cheapflights users on 9/1. 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 10/19:04 am -
Nonstop1h 36m
Deal found 9/1![United Airlines logo]()
$59
This American Airlines deal was found by Cheapflights users on 9/1. 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 10/125:00 am -
Nonstop1h 26m
Deal found 9/1![American Airlines logo]()
$60
This Super.com deal was found by Cheapflights users on 9/2. 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.
Mon 9/288:10 pm -
1 stop28h 13m
Deal found 9/2![Frontier logo]()
$64
This Expedia deal was found by Cheapflights users on 9/1. 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 10/110:20 am -
1 stop9h 15m
Deal found 9/1![Frontier logo]()
$65
This American Airlines deal was found by Cheapflights users on 9/2. 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.
Fri 9/257:21 am -
Nonstop1h 38m
Deal found 9/2![American Airlines logo]()
$76
This Delta deal was found by Cheapflights users on 9/2. 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 9/2610:29 am -
1 stop5h 45m
Deal found 9/2![Delta logo]()
$79
This Super.com deal was found by Cheapflights users on 9/1. 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.
Fri 10/98:00 pm -
1 stop28h 24m
Deal found 9/1![Frontier logo]()
$81
This Expedia deal was found by Cheapflights users on 8/31. 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.
Fri 10/307:59 pm -
1 stop28h 22m
Deal found 8/31![Frontier logo]()
$82
This Delta deal was found by Cheapflights users on 9/1. 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.
Fri 10/306:47 am -
1 stop3h 42m
Deal found 9/1![Delta logo]()
$86
This CheapOair deal was found by Cheapflights users on 9/2. 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.
Fri 9/2512:17 pm -
1 stop17h 21m
Deal found 9/2![Frontier logo]()
$87
This United Airlines deal was found by Cheapflights users on 9/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/289:04 am -
Nonstop1h 36m
Deal found 9/3![United Airlines logo]()
$94
This Super.com deal was found by Cheapflights users on 8/31. 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 9/308:10 pm -
1 stop28h 13m
Deal found 8/31![Frontier logo]()
$95
Find flight deals from St. Louis to O'Hare Intl
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to O'Hare Intl (ORD). 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 September 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $117 (American Airlines) |
One-way from | $59 (United Airlines) |
Popular in | July |
Cheapest in | December |
Average price | $371 |
Good round-trip deal | $397 or less |
Good one-way deal | $262 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to O'Hare Intl 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 7,457,451 searches. Data last updated September 3, 2026.
Use the filters below to find and compare flights from St. Louis to Chicago O'Hare Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Wed 9/30
8:00 am-9:31 am
Nonstop1h 31m
Chicago O'Hare Intl
Wed 10/7
9:30 pm-10:59 pm
Nonstop1h 29m
$117
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Fri 10/9
8:00 am-9:31 am
Nonstop1h 31m
Chicago O'Hare Intl
Sat 10/10
7:50 pm-9:21 pm
Nonstop1h 31m
$134
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Sat 10/3
6:40 am-10:37 am
1 stop3h 57m
Chicago O'Hare Intl
Tue 10/6
7:00 am-1:53 pm
1 stop6h 53m
$157
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Thu 9/24
6:40 am-12:59 pm
1 stop6h 19m
Chicago O'Hare Intl
Mon 9/28
5:50 pm-11:16 pm
1 stop5h 26m
$164
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Thu 12/17
6:32 am-10:59 am
1 stop4h 27m
Chicago O'Hare Intl
Mon 12/21
1:26 pm-5:26 pm
1 stop4h 00m
$198
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Sat 9/19
6:53 pm-8:29 pm
Nonstop1h 36m
Chicago O'Hare Intl
Wed 9/23
10:25 am-11:57 am
Nonstop1h 32m
$259
Quickest round-trip
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Fri 10/23
5:36 pm-7:05 pm
Nonstop1h 29m
Chicago O'Hare Intl
Sun 10/25
8:10 pm-9:40 pm
Nonstop1h 30m
$259
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Thu 12/10
2:17 pm-8:15 pm
1 stop5h 58m
Chicago O'Hare Intl
Wed 1/13
9:30 am-2:31 pm
1 stop5h 01m
$279
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Fri 12/4
3:32 pm-7:43 pm
1 stop4h 11m
Chicago O'Hare Intl
Fri 12/11
2:44 pm-8:32 pm
1 stop5h 48m
$279
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Tue 9/22
11:21 am-4:59 pm
1 stop5h 38m
Chicago O'Hare Intl
Wed 9/23
1:55 pm-8:35 pm
1 stop6h 40m
$279
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from St. Louis to O'Hare Intl
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 O'Hare Intl in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Chicago O'Hare Intl Airport 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 O'Hare Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Chicago O'Hare Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl
Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from St. Louis with our price prediction graph.
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 O'Hare Intl Airport
Prices
Airlines
How far ahead should I book a flight from St. Louis to Chicago O'Hare Intl Airport?
To ensure you get the cheapest price possible for a flight from St. Louis to Chicago O'Hare Intl Airport, you should look to book at least 36 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from St. Louis to Chicago O'Hare Intl Airport?
Currently, December is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of $258). Flying from St. Louis to Chicago O'Hare Intl Airport in July is currently the most expensive (average of $439). 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 ORD?
Find hourly flight availability from St. Louis to O'Hare Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 3, 2026.
It’s typically best to fly out from St. Louis to Chicago O'Hare Intl Airport in the morning. Doing so could potentially save you 46% on the flight price compared to flying at noon, which is usually more expensive.
What is the cheapest day to fly from St. Louis to Chicago O'Hare Intl Airport?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to O'Hare Intl. Price data was last updated on August 29, 2026.
Travelers seeking maximum savings on their St. Louis to Chicago O'Hare Intl Airport flight should consider departing on Thursday mornings when fares are most often at their lowest. Thursday at noon 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 O'Hare Intl Airport 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 O'Hare Intl Airport trip
Our travel experts
Reviews of airlines servicing O'Hare Intl
Get insights into the airlines that provide service to O'Hare Intl. 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 O'Hare Intl. Reviews last updated September 3, 2026.
See what other customers who have flown with United Airlines and American Airlines from St. Louis to Chicago O'Hare Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
6.7
Overall
7.4
Crew
8.1
Comfort
7.3
Boarding
7.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.7
Overall
7.4
Crew
8.1
Comfort
7.3
Boarding
7.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.7
Overall
7.4
Crew
8.1
Comfort
7.3
Boarding
7.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Related info for your journey
Find useful and relevant information for your journey from St. Louis to O'Hare Intl. 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 O'Hare Intl Airport?
Book flights to Chicago O'Hare Intl Airport if you plan to visit one of these locationsBenton Harbor
Rosemont
Naperville
Glenview
Lake Geneva
Schaumburg
Oakbrook Terrace
Delavan
Oak Brook
Libertyville
Des Plaines
Orland Park
Hoffman Estates
Aurora
Beloit
Rockford
South Holland
Elgin
Racine
Skokie
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Other flights to O'Hare Intl
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St. Louis and O'Hare Intl flights
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Top 2 airlines flying from St. Louis to O'Hare Intl
Discover the top 2 airlines that operate flights from St. Louis to O'Hare Intl. 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 7,457,451 searches. Data last updated September 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$323 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$128 | Average$417 | FlexibilityNo cancel fee | On-time69% |