How do I get Price Alerts for flights from St. Louis to Decatur, Illinois?

Search flight deals from St. Louis to Decatur, Illinois . While viewing offers you’ll have the option to create a Price Alert.

How can I save money on flights from St. Louis to Decatur, Illinois with momondo?

Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore” . Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

How does momondo find its flight prices?

We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

When did momondo last update prices for flights from Lambert-St Louis Airport to Decatur Arpt Airport?

Prices for flights from Lambert-St Louis Airport to Decatur Arpt Airport were last updated today.

How old do you have to be to fly from Lambert-St Louis Airport to Decatur Arpt Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Decatur Arpt Airport.

What documentation or ID do you need to fly to Decatur Arpt Airport?

The necessary travel and health documents for your Decatur Arpt Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$406 Cheap Flights from St. Louis to Decatur in 2026

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to Decatur

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:55 am - 8:52 am

STL

DEC

22h 57m

1 stop

7:15 pm - 10:59 pm

DEC

STL

3h 44m

1 stop

$435United Airlines

jue., feb. 12 - lun., feb. 16

7:00 pm - 5:53 pm

STL

DEC

22h 53m

1 stop

7:15 pm - 9:42 pm

DEC

STL

26h 27m

1 stop

$535United Airlines

vie., mar. 13 - vie., mar. 20

United Airlines flights from St. Louis to Decatur, Illinois

Our best United Airlines deals on St. Louis to Decatur, Illinois flight tickets

United Airlines

Feb 12

STL9:55 amLambert-St Louis

22h 57m

1 stop

DEC8:52 amDecatur Arpt

Feb 16

DEC7:15 pmDecatur Arpt

3h 44m

1 stop

STL10:59 pmLambert-St Louis

$435

United Airlines

Mar 13

STL7:00 pmLambert-St Louis

22h 53m

1 stop

DEC5:53 pmDecatur Arpt

Mar 20

DEC7:15 pmDecatur Arpt

26h 27m

1 stop

STL9:42 pmLambert-St Louis

$535

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Decatur, Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisDecatur

STL - DEC

STLDEC

Lambert-St Louis

jue. 2/12

9:55 am-8:52 am

1 stop22h 57m

Decatur Arpt

lun. 2/16

7:15 pm-10:59 pm

1 stop3h 44m

$435

St. LouisDecatur

STL - DEC

STLDEC

Lambert-St Louis

vie. 3/13

7:00 pm-5:53 pm

1 stop22h 53m

Decatur Arpt

vie. 3/20

7:15 pm-9:42 pm

1 stop26h 27m

$535

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to Decatur, Illinois

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Decatur, Illinois according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Decatur, Illinois (STL to DEC) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Decatur, Illinois

Fastest flight time	22h 53m
Direct flights	None

The fastest flight from St. Louis to Decatur, Illinois takes 22h 53m

There are no direct flights from St. Louis to Decatur, Illinois. There are no popular flight routes from St. Louis to Decatur, Illinois.

Search flight deals

How far is Lambert-St Louis to Decatur Arpt by plane?
The straight-line distance from Lambert-St Louis to Decatur Arpt is 106.9 mi. In terms of flight time, this usually takes a little over 22h 53m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Decatur Arpt Airport?
Prices for flights from Lambert-St Louis Airport to Decatur Arpt Airport were last updated today.
How old do you have to be to fly from Lambert-St Louis Airport to Decatur Arpt Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Decatur Arpt Airport.
What documentation or ID do you need to fly to Decatur Arpt Airport?
The necessary travel and health documents for your Decatur Arpt Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

How do I get Price Alerts for flights from St. Louis to Decatur, Illinois?
Search flight deals from St. Louis to Decatur, Illinois. While viewing offers you’ll have the option to create a Price Alert.
How can I save money on flights from St. Louis to Decatur, Illinois with momondo?
Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.
How does momondo find its flight prices?
We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Effingham

Mattoon

Forsyth

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Decatur?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Decatur from St. Louis.

Can I find flights from St. Louis to Decatur with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Decatur from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Decatur?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Decatur.

I’m not ready to book a flight from St. Louis to Decatur right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Decatur, momondo offers a useful price alert feature which will track prices for flights to Decatur from St. Louis and alert you when they change.