$354+ Cheap flights from Decatur, IL to St. Louis (DEC - STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — STL
Nov 29 — Dec 61
Round-trip
1 adult, Economy
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Find cheap flights from Decatur to St. Louis 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.Cheap flight deals from Decatur to St. Louis
Cheapest
Best
Last-minute
Cheapest flights from Decatur to St. LouisExplore the most affordable flight options available from Decatur to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from Decatur to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/129:10 am -
1 stop6h 33m
Mon 11/161:08 pm -
1 stop5h 02m
Deal found 10/28![United Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/119:10 am -
1 stop6h 33m
Sun 11/151:08 pm -
1 stop5h 02m
Deal found 10/27![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Mon 11/239:10 am -
1 stop10h 13m
Mon 11/306:50 pm -
1 stop23h 19m
Deal found 10/26![United Airlines logo]()
$515
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Mon 11/236:57 pm -
1 stop4h 27m
Tue 11/245:00 am -
1 stop3h 35m
Deal found 10/30![United Airlines logo]()
$592
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Tue 11/107:02 pm -
1 stop26h 38m
Sat 11/1411:15 am -
1 stop6h 40m
Deal found 10/26![United Airlines logo]()
$611
Best flights from Decatur to St. LouisDiscover carefully curated flight deals from Decatur to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from Decatur to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Thu 11/269:10 am -
1 stop25h 22m
Thu 12/36:30 am -
1 stop25h 25m
Deal found 10/29![United Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/129:10 am -
1 stop6h 33m
Mon 11/161:08 pm -
1 stop5h 02m
Deal found 10/28![United Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/136:57 pm -
1 stop4h 27m
Tue 11/171:08 pm -
1 stop5h 02m
Deal found 10/29![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/119:10 am -
1 stop6h 33m
Sun 11/151:08 pm -
1 stop5h 02m
Deal found 10/27![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Mon 11/239:10 am -
1 stop10h 13m
Mon 11/306:50 pm -
1 stop23h 19m
Deal found 10/26![United Airlines logo]()
$515
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Mon 11/236:57 pm -
1 stop4h 27m
Tue 11/245:00 am -
1 stop3h 35m
Deal found 10/30![United Airlines logo]()
$592
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Tue 11/107:02 pm -
1 stop26h 38m
Sat 11/1411:15 am -
1 stop6h 40m
Deal found 10/26![United Airlines logo]()
$611
Last-minute flights from Decatur to St. LouisDiscover last-minute flight deals from Decatur to St. Louis. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Decatur to St. Louis. Data last updated October 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Tue 11/107:02 pm -
1 stop26h 38m
Sat 11/1411:15 am -
1 stop6h 40m
Deal found 10/26![United Airlines logo]()
$611
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/119:10 am -
1 stop6h 33m
Sun 11/151:08 pm -
1 stop5h 02m
Deal found 10/27![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/129:10 am -
1 stop6h 33m
Mon 11/161:08 pm -
1 stop5h 02m
Deal found 10/28![United Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Mon 11/239:10 am -
1 stop10h 13m
Mon 11/306:50 pm -
1 stop23h 19m
Deal found 10/26![United Airlines logo]()
$515
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Mon 11/236:57 pm -
1 stop4h 27m
Tue 11/245:00 am -
1 stop3h 35m
Deal found 10/30![United Airlines logo]()
$592
Find flight deals from Decatur to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to St. Louis (STL). 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 October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $354 (United Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Decatur to St. Louis 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 October 30, 2026.
Use the filters below to find and compare flights from Decatur to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Thu 11/26
9:10 am-10:32 am
1 stop25h 22m
Lambert-St Louis
Thu 12/3
6:30 am-7:55 am
1 stop25h 25m
$354
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Thu 11/12
9:10 am-3:43 pm
1 stop6h 33m
Lambert-St Louis
Mon 11/16
1:08 pm-6:10 pm
1 stop5h 02m
$354
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Fri 11/13
6:57 pm-11:24 pm
1 stop4h 27m
Lambert-St Louis
Tue 11/17
1:08 pm-6:10 pm
1 stop5h 02m
$444
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Wed 11/11
9:10 am-3:43 pm
1 stop6h 33m
Lambert-St Louis
Sun 11/15
1:08 pm-6:10 pm
1 stop5h 02m
$444
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Mon 11/23
9:10 am-7:23 pm
1 stop10h 13m
Lambert-St Louis
Mon 11/30
6:50 pm-6:09 pm
1 stop23h 19m
$515
Quickest round-trip
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Mon 11/23
6:57 pm-11:24 pm
1 stop4h 27m
Lambert-St Louis
Tue 11/24
5:00 am-8:35 am
1 stop3h 35m
$592
DecaturSt. Louis
DEC Decatur Arpt - STL Lambert-St Louis
DECSTL
Decatur Arpt
Tue 11/10
7:02 pm-9:40 pm
1 stop26h 38m
Lambert-St Louis
Sat 11/14
11:15 am-5:55 pm
1 stop6h 40m
$611
Sorted by cheapest first
Compare providers for flights from Decatur to St. Louis
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 Decatur to St. Louis in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Decatur, Illinois-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Decatur, Illinois-St. Louis 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 Decatur, Illinois-St. Louis 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 Decatur to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Decatur with our price prediction graph.
DEC-STL
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.
Related info for your journey
Find useful and relevant information for your journey from Decatur to St. Louis. 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 St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
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Glencoe
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