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Cheap flights from Indianapolis to St. Louis from $63

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Indianapolis to St. Louis departing on 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Indianapolis to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:49 pm - 9:40 am
IND
-
STL
13h 51m
2 stops
Frontier Logo
10:35 am - 11:44 am
STL
-
IND
24h 09m
1 stop
$232Frontier
Tue, Sep 8 - Fri, Sep 11
Southwest Logo
7:20 am - 11:50 am
IND
-
STL
5h 30m
1 stop
Southwest Logo
6:15 pm - 10:35 pm
STL
-
IND
3h 20m
1 stop
$233Southwest
Thu, Aug 6 - Mon, Aug 10
Multiple Airlines Logo
7:30 am - 8:57 am
IND
-
STL
26h 27m
2 stops
Multiple Airlines Logo
6:34 pm - 11:25 am
STL
-
IND
15h 51m
1 stop
$234Multiple Airlines
Sun, Aug 9 - Sun, Aug 16
Southwest Logo
6:55 am - 10:10 am
IND
-
STL
4h 15m
1 stop
Southwest Logo
11:40 am - 9:25 pm
STL
-
IND
8h 45m
2 stops
$238Southwest
Thu, Aug 6 - Mon, Aug 10
Southwest Logo
1:00 pm - 8:40 pm
IND
-
STL
8h 40m
2 stops
Southwest Logo
2:45 pm - 10:20 pm
STL
-
IND
6h 35m
2 stops
$243Southwest
Tue, Aug 11 - Mon, Aug 17
Frontier Logo
8:53 pm - 7:23 pm
IND
-
STL
23h 30m
1 stop
Frontier Logo
4:09 pm - 10:03 am
STL
-
IND
16h 54m
1 stop
$249Frontier
Sat, Aug 1 - Sat, Aug 8
Frontier Logo
7:38 pm - 11:59 pm
IND
-
STL
29h 21m
1 stop
Frontier Logo
6:34 pm - 11:25 am
STL
-
IND
15h 51m
1 stop
$270Frontier
Sun, Aug 9 - Sun, Aug 16
Southwest Logo
5:35 pm - 10:10 pm
IND
-
STL
5h 35m
1 stop
Southwest Logo
8:00 am - 12:40 pm
STL
-
IND
3h 40m
1 stop
$285Southwest
Tue, Sep 8 - Fri, Sep 11
Southwest Logo
6:45 am - 10:30 am
IND
-
STL
4h 45m
1 stop
Southwest Logo
1:40 pm - 9:35 pm
STL
-
IND
6h 55m
2 stops
$290Southwest
Fri, Sep 25 - Sat, Sep 26
Southwest Logo
1:00 pm - 8:40 pm
IND
-
STL
8h 40m
2 stops
Southwest Logo
8:30 am - 6:30 pm
STL
-
IND
9h 00m
2 stops
$295Southwest
Tue, Sep 8 - Fri, Sep 11

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Southwest flights from Indianapolis to St. Louis

Our best Southwest deals on Indianapolis to St. Louis flight tickets
Southwest
Aug 6
IND7:20 amIndianapolis
5h 30m
1 stop
STL11:50 amLambert-St Louis
Aug 10
STL6:15 pmLambert-St Louis
3h 20m
1 stop
IND10:35 pmIndianapolis
$233
Southwest
Aug 6
IND6:55 amIndianapolis
4h 15m
1 stop
STL10:10 amLambert-St Louis
Aug 10
STL11:40 amLambert-St Louis
8h 45m
2 stops
IND9:25 pmIndianapolis
$238
Southwest
Aug 11
IND1:00 pmIndianapolis
8h 40m
2 stops
STL8:40 pmLambert-St Louis
Aug 17
STL2:45 pmLambert-St Louis
6h 35m
2 stops
IND10:20 pmIndianapolis
$243

Frontier flights from Indianapolis to St. Louis

Our best Frontier deals on Indianapolis to St. Louis flight tickets
Frontier
Sep 8
IND8:49 pmIndianapolis
13h 51m
2 stops
STL9:40 amLambert-St Louis
Sep 11
STL10:35 amLambert-St Louis
24h 09m
1 stop
IND11:44 amIndianapolis
$232
Frontier
Aug 1
IND8:53 pmIndianapolis
23h 30m
1 stop
STL7:23 pmLambert-St Louis
Aug 8
STL4:09 pmLambert-St Louis
16h 54m
1 stop
IND10:03 amIndianapolis
$249
Frontier
Aug 9
IND7:38 pmIndianapolis
29h 21m
1 stop
STL11:59 pmLambert-St Louis
Aug 16
STL6:34 pmLambert-St Louis
15h 51m
1 stop
IND11:25 amIndianapolis
$270

momondo Fare Finder

 
Customize your flight search to find flights from Indianapolis 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, momondo users made 832,500 searches. Data last updated July 16, 2026.
Use the filters below to find and compare flights from Indianapolis to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 9/8

8:49 pm-9:40 am

2 stops13h 51m

Lambert-St Louis

Fri 9/11

10:35 am-11:44 am

1 stop24h 09m

$232
Quickest round-trip

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Thu 8/6

7:20 am-11:50 am

1 stop5h 30m

Lambert-St Louis

Mon 8/10

6:15 pm-10:35 pm

1 stop3h 20m

$233

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Sun 8/9

7:30 am-8:57 am

2 stops26h 27m

Lambert-St Louis

Sun 8/16

6:34 pm-11:25 am

1 stop15h 51m

$234

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Thu 8/6

6:55 am-10:10 am

1 stop4h 15m

Lambert-St Louis

Mon 8/10

11:40 am-9:25 pm

2 stops8h 45m

$238

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 8/11

1:00 pm-8:40 pm

2 stops8h 40m

Lambert-St Louis

Mon 8/17

2:45 pm-10:20 pm

2 stops6h 35m

$243

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Sat 8/1

8:53 pm-7:23 pm

1 stop23h 30m

Lambert-St Louis

Sat 8/8

4:09 pm-10:03 am

1 stop16h 54m

$249

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Sun 8/9

7:38 pm-11:59 pm

1 stop29h 21m

Lambert-St Louis

Sun 8/16

6:34 pm-11:25 am

1 stop15h 51m

$270

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 9/8

5:35 pm-10:10 pm

1 stop5h 35m

Lambert-St Louis

Fri 9/11

8:00 am-12:40 pm

1 stop3h 40m

$285

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Fri 9/25

6:45 am-10:30 am

1 stop4h 45m

Lambert-St Louis

Sat 9/26

1:40 pm-9:35 pm

2 stops6h 55m

$290

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 9/8

1:00 pm-8:40 pm

2 stops8h 40m

Lambert-St Louis

Fri 9/11

8:30 am-6:30 pm

2 stops9h 00m

$295

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Indianapolis to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to St. Louis?

In general, August is the cheapest month to fly from Indianapolis to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. The month of November is another great option to travel to St. Louis, with average flight prices from Indianapolis averaging around $256.

What is the cheapest Indianapolis to Lambert-St Louis flight route?

Fly from Indianapolis to Lambert-St Louis for the best Indianapolis - Lambert-St Louis flight prices

What cabin class options are available on Indianapolis to St. Louis flights?

There is only 1 cabin class available to choose from on Indianapolis to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Indianapolis to St. Louis flight prices changed over time?

As of July 2026, prices for Indianapolis to St. Louis flights are approximately 11% more expensive when compared to flights at the same time last year.

When to book flights from Indianapolis to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Indianapolis to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Indianapolis to St. Louis (IND to STL) flight deals and tips

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

Fastest flight time

3h 39m

Direct flights

None
The fastest flight from Indianapolis to St. Louis takes 3h 39m
There are no direct flights from Indianapolis to St. Louis. There are no popular flight routes from Indianapolis to St. Louis.
Search flight deals

Frequently asked questions about flying from Indianapolis to St. Louis

  • How far is Indianapolis to Lambert-St Louis by plane?

    The distance between Indianapolis and Lambert-St Louis is about 230.0 mi. Typically, this will take 3h 39m by plane in normal conditions.

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

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

  • How old do you have to be to fly from Indianapolis Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Indianapolis Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Indianapolis to St. Louis?

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Collinsville
Florissant
St. Peters
Maryland Heights
O'Fallon
Alton
Farmington
Wentzville
Clayton
Fenton
Festus
Eureka
Edwardsville
Litchfield
Grafton
Shrewsbury

Why use momondo?

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

It is quick and easy to find Indianapolis to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

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

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

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

momondo helps you find the best flight between Indianapolis and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of Indianapolis to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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