$334+ Cheap flights from St. Louis to Decatur, IL (STL - DEC)
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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEC
Oct 10 — Oct 171
Round-trip
1 adult, Economy
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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
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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 St. Louis to Decatur
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Best
Last-minute
Cheapest flights from St. Louis to DecaturExplore the most affordable flight options available from St. Louis to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.
Explore the most affordable flight options available from St. Louis to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Sat 10/315:34 pm -
1 stop16h 01m
Wed 11/46:57 pm -
1 stop26h 43m
Deal found 9/7![United Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 9/5. 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.
Sun 9/612:59 pm -
1 stop5h 00m
Sat 9/127:20 pm -
1 stop3h 39m
Deal found 9/5![United Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Tue 10/61:29 pm -
1 stop5h 14m
Mon 10/127:18 pm -
1 stop3h 41m
Deal found 9/6![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Wed 9/98:00 am -
1 stop10h 44m
Wed 9/169:13 am -
1 stop6h 25m
Deal found 9/8![United Airlines logo]()
$595
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Mon 9/2112:59 pm -
1 stop5h 44m
Fri 9/257:18 pm -
1 stop21h 43m
Deal found 9/6![United Airlines logo]()
$620
This United Airlines deal was found by Cheapflights users on 9/5. 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.
Sun 9/2012:59 pm -
1 stop5h 45m
Thu 9/247:18 pm -
1 stop3h 41m
Deal found 9/5![United Airlines logo]()
$632
Best flights from St. Louis to DecaturDiscover carefully curated flight deals from St. Louis to Decatur that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
Discover carefully curated flight deals from St. Louis to Decatur that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/8. 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 10/315:34 pm -
1 stop16h 01m
Wed 11/46:57 pm -
1 stop26h 43m
Deal found 9/8![United Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Mon 9/2112:59 pm -
1 stop5h 44m
Fri 9/257:18 pm -
1 stop21h 43m
Deal found 9/6![United Airlines logo]()
$620
This United Airlines deal was found by Cheapflights users on 9/5. 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.
Sun 9/2012:59 pm -
1 stop5h 45m
Thu 9/247:18 pm -
1 stop3h 41m
Deal found 9/5![United Airlines logo]()
$632
Last-minute flights from St. Louis to DecaturDiscover last-minute flight deals from St. Louis to Decatur. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Decatur. Data last updated September 10, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Wed 9/98:00 am -
1 stop10h 44m
Wed 9/169:13 am -
1 stop6h 25m
Deal found 9/8![United Airlines logo]()
$595
This United Airlines deal was found by Cheapflights users on 9/5. 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.
Sun 9/2012:59 pm -
1 stop5h 45m
Thu 9/247:18 pm -
1 stop3h 41m
Deal found 9/5![United Airlines logo]()
$632
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Mon 9/2112:59 pm -
1 stop5h 44m
Fri 9/257:18 pm -
1 stop21h 43m
Deal found 9/6![United Airlines logo]()
$620
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Tue 10/61:29 pm -
1 stop5h 14m
Mon 10/127:18 pm -
1 stop3h 41m
Deal found 9/6![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Sat 10/315:34 pm -
1 stop16h 01m
Wed 11/46:57 pm -
1 stop26h 43m
Deal found 9/7![United Airlines logo]()
$334
Find flight deals from St. Louis to Decatur
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Decatur (DEC). 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 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $334 (United Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Decatur 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 10, 2026.
Use the filters below to find and compare flights from St. Louis to Decatur that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisDecatur
STL Lambert-St Louis - DEC Decatur Arpt
STLDEC
Lambert-St Louis
Sat 10/31
5:34 pm-9:35 am
1 stop16h 01m
Decatur Arpt
Wed 11/4
6:57 pm-9:40 pm
1 stop26h 43m
$334
St. LouisDecatur
STL Lambert-St Louis - DEC Decatur Arpt
STLDEC
Lambert-St Louis
Mon 9/21
12:59 pm-6:43 pm
1 stop5h 44m
Decatur Arpt
Fri 9/25
7:18 pm-5:01 pm
1 stop21h 43m
$620
Quickest round-trip
St. LouisDecatur
STL Lambert-St Louis - DEC Decatur Arpt
STLDEC
Lambert-St Louis
Sun 9/20
12:59 pm-6:44 pm
1 stop5h 45m
Decatur Arpt
Thu 9/24
7:18 pm-10:59 pm
1 stop3h 41m
$632
Sorted by cheapest first
- Most accurate provider: When it comes to deals on St. Louis-Decatur, Illinois flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Decatur, Illinois flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Decatur, Illinois flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Decatur, Illinois 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-Decatur, Illinois 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 Decatur
Have a flexible travel schedule? Discover the best time to fly to Decatur from St. Louis with our price prediction graph.
STL-DEC
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 St. Louis to Decatur. 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 Decatur?
Book flights to Decatur if you plan to visit one of these locationsMattoon
Effingham
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