What airlines fly to St. Louis?

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to St. Louis from Indianapolis according to our data. American Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Indianapolis to Lambert-St Louis?

Frontier and American Airlines are the most popular carriers operating from Indianapolis to Lambert-St Louis

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 many operators does momondo search for flights from Indianapolis Airport to Lambert-St Louis Airport?

As of November 2025, there are 2 operators available to choose from for flights from Indianapolis Airport to Lambert-St Louis Airport.

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.

$71 Cheap Flights from Indianapolis to St. Louis in 2025/26

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Find the cheapest flights from Indianapolis to St. Louis

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:19 pm - 10:14 amIND-STL

15h 55m1 stop

10:42 am - 8:26 pmSTL-IND

32h 44m2 stops

$238Frontier

Find Deal

qui, dez 4 - dom, dez 14

2:00 pm - 4:55 pmIND-STL

3h 55m1 stop

6:45 am - 11:15 amSTL-IND

3h 30m1 stop

$257Delta

Find Deal

ter, mar 10 - qua, mar 11

7:19 pm - 10:14 amIND-STL

15h 55m1 stop

3:30 pm - 10:23 amSTL-IND

17h 53m1 stop

$269Frontier

Find Deal

qui, dez 4 - dom, dez 14

9:32 am - 11:57 pmIND-STL

15h 25m1 stop

4:13 pm - 10:28 amSTL-IND

41h 15m2 stops

$283Multiple Airlines

Find Deal

ter, nov 25 - sáb, nov 29

7:50 pm - 11:25 pmIND-STL

4h 35m1 stop

6:10 am - 11:47 amSTL-IND

4h 37m1 stop

$287Delta

Find Deal

sex, fev 13 - dom, fev 15

6:50 am - 1:35 pmIND-STL

7h 45m1 stop

5:35 am - 12:40 pmSTL-IND

6h 05m2 stops

$292Southwest

Find Deal

qui, abr 2 - ter, abr 7

8:15 pm - 10:02 amIND-STL

14h 47m1 stop

4:13 pm - 8:08 amSTL-IND

14h 55m1 stop

$319Multiple Airlines

Find Deal

ter, nov 25 - sáb, nov 29

7:50 am - 2:40 pmIND-STL

7h 50m2 stops

10:00 am - 8:00 pmSTL-IND

9h 00m2 stops

$337Southwest

Find Deal

qui, dez 4 - dom, dez 14

6:15 pm - 11:10 pmIND-STL

5h 55m1 stop

7:50 am - 5:45 pmSTL-IND

8h 55m2 stops

$352Southwest

Find Deal

sex, fev 13 - dom, fev 15

9:55 am - 5:15 pmIND-STL

8h 20m2 stops

7:50 am - 4:35 pmSTL-IND

7h 45m2 stops

$388Southwest

Find Deal

sex, fev 13 - dom, fev 15

United Airlines flights from Indianapolis to St. Louis

Our best United Airlines deals on Indianapolis to St. Louis flight tickets

United Airlines

Nov 18

IND11:25 amIndianapolis

5h 22m

1 stop

STL3:47 pmLambert-St Louis

Nov 18

STL6:43 pmLambert-St Louis

3h 35m

1 stop

IND11:18 pmIndianapolis

$485

Find similar

United Airlines

Nov 26

IND7:15 amIndianapolis

4h 36m

1 stop

STL10:51 amLambert-St Louis

Nov 30

STL6:30 amLambert-St Louis

3h 43m

1 stop

IND11:13 amIndianapolis

$730

Find similar

Southwest flights from Indianapolis to St. Louis

Our best Southwest deals on Indianapolis to St. Louis flight tickets

Southwest

Dec 4

IND6:45 amIndianapolis

8h 40m

1 stop

STL2:25 pmLambert-St Louis

Dec 8

STL8:25 amLambert-St Louis

7h 35m

2 stops

IND5:00 pmIndianapolis

$284

Find similar

Southwest

Apr 2

IND6:50 amIndianapolis

7h 45m

1 stop

STL1:35 pmLambert-St Louis

Apr 7

STL5:35 amLambert-St Louis

6h 05m

2 stops

IND12:40 pmIndianapolis

$292

Find similar

Southwest

Dec 4

IND7:50 amIndianapolis

7h 50m

2 stops

STL2:40 pmLambert-St Louis

Dec 8

STL8:25 amLambert-St Louis

7h 35m

2 stops

IND5:00 pmIndianapolis

$318

Find similar

Fly from

Fly to

Route

Depart

Return

Price

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

qui 12/4

7:19 pm-10:14 am

1 stop15h 55m

Lambert-St Louis

dom 12/14

10:42 am-8:26 pm

2 stops32h 44m

$238

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

ter 3/10

2:00 pm-4:55 pm

1 stop3h 55m

Lambert-St Louis

qua 3/11

6:45 am-11:15 am

1 stop3h 30m

$257

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

qui 12/4

7:19 pm-10:14 am

1 stop15h 55m

Lambert-St Louis

dom 12/14

3:30 pm-10:23 am

1 stop17h 53m

$269

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

ter 11/25

9:32 am-11:57 pm

1 stop15h 25m

Lambert-St Louis

sáb 11/29

4:13 pm-10:28 am

2 stops41h 15m

$283

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

sex 2/13

7:50 pm-11:25 pm

1 stop4h 35m

Lambert-St Louis

dom 2/15

6:10 am-11:47 am

1 stop4h 37m

$287

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

qui 4/2

6:50 am-1:35 pm

1 stop7h 45m

Lambert-St Louis

ter 4/7

5:35 am-12:40 pm

2 stops6h 05m

$292

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

ter 11/25

8:15 pm-10:02 am

1 stop14h 47m

Lambert-St Louis

sáb 11/29

4:13 pm-8:08 am

1 stop14h 55m

$319

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

qui 12/4

7:50 am-2:40 pm

2 stops7h 50m

Lambert-St Louis

dom 12/14

10:00 am-8:00 pm

2 stops9h 00m

$337

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

sex 2/13

6:15 pm-11:10 pm

1 stop5h 55m

Lambert-St Louis

dom 2/15

7:50 am-5:45 pm

2 stops8h 55m

$352

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

sex 2/13

9:55 am-5:15 pm

2 stops8h 20m

Lambert-St Louis

dom 2/15

7:50 am-4:35 pm

2 stops7h 45m

$388

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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

In general, November 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 $256. The month of April is another great option to travel to St. Louis, with average flight prices from Indianapolis averaging around $289.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $265. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $392. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Indianapolis in the evening is the least expensive time of day to depart. momondo users have found prices as low as $291 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $345 per ticket.

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

As of November 2025, prices for Indianapolis to St. Louis flights are approximately 41% cheaper 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

Direct flights	None

There are no direct flights from Indianapolis to St. Louis. There are no popular flight routes from Indianapolis to St. Louis.

Search flight deals

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 50m 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 many operators does momondo search for flights from Indianapolis Airport to Lambert-St Louis Airport?
As of November 2025, there are 2 operators available to choose from for flights from Indianapolis Airport to Lambert-St Louis Airport.
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 airline from Indianapolis to St. Louis?
momondo data reveals that the most frequently booked airline on the route from Indianapolis to St. Louis is American Airlines, representing 63% of all bookings. The subsequent popular airline is Delta at 37%.

Best airlines flying from Indianapolis to St. Louis

Compare and see reviews for airlines that fly from Indianapolis to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $196	Free Cancellation	Rating 7.2 11,051 reviews		Search American Airlines flights
Delta	PriceFrom $266	Free Cancellation	Rating 7.9 8,007 reviews		Search Delta flights

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Maryland Heights

O'Fallon

Wentzville

Fenton

Collinsville

St. Peters

Alton

Farmington

Festus

Glencoe

Edwardsville

Clayton

Eureka

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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.