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$99+ Cheap flights from Indianapolis to St. Louis (IND - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
IND — STL
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from Indianapolis to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Indianapolis (IND) 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 July 30, 2025.

Round-trip from

$204
(American Airlines)

One-way from

$108
(Delta)

Popular in

July

Cheapest in

April

Average price

$486
From Indianapolis to Lambert-St Louis
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One-way flight from Indianapolis to Lambert-St Louis
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Highest demand for flights based on searches. 3% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Indianapolis to St. Louis

Cheapest flights from Indianapolis to St. Louis
Explore the most affordable flight options available from Indianapolis to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This American Airlines deal was found by Cheapflights users on 7/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/265:30 pmIND - STL
1 stop4h 20mAmerican Airlines
Sat 9/69:56 amSTL - IND
1 stop6h 06mAmerican Airlines
Deal found 7/28$197
This Southwest deal was found by Cheapflights users on 7/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/166:20 amIND - STL
1 stop5h 35mSouthwest
Tue 9/231:35 pmSTL - IND
2 stops7h 50mSouthwest
Deal found 7/28$202
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3011:31 amIND - STL
1 stop5h 35mDelta
Sun 8/317:00 amSTL - IND
1 stop4h 50mDelta
Deal found 7/29$217
This FlightHub deal was found by Cheapflights users on 7/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/177:30 pmIND - STL
1 stop23h 25mMultiple Airlines
Sun 10/199:47 amSTL - IND
1 stop8h 11mMultiple Airlines
Deal found 7/29$270
This Mytrip deal was found by Cheapflights users on 7/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/285:05 amIND - STL
2 stops9h 27mSpirit Airlines
Sun 8/312:30 pmSTL - IND
2 stops21h 23mSpirit Airlines
Deal found 7/28$276
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/151:00 pmIND - STL
1 stop21h 11mFrontier
Sat 8/165:40 pmSTL - IND
1 stop23h 13mFrontier
Deal found 7/30$281
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Wed 8/137:20 amIND - STL
1 stop6h 07mUnited Airlines
Sun 8/178:00 amSTL - IND
1 stop6h 18mUnited Airlines
Deal found 7/29$437

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated July 30, 2025.
Use the filters below to find and compare flights from Indianapolis to St. Louis that are best for you.

Fly from

Indianapolis

Fly to

St. Louis

Route

Depart

Return

Price

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 8/26

5:30 pm-8:50 pm

1 stop4h 20m

Lambert-St Louis

Sat 9/6

9:56 am-5:02 pm

1 stop6h 06m

$197

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 9/16

6:20 am-10:55 am

1 stop5h 35m

Lambert-St Louis

Tue 9/23

1:35 pm-10:25 pm

2 stops7h 50m

$202

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Sat 8/30

11:31 am-4:06 pm

1 stop5h 35m

Lambert-St Louis

Sun 8/31

7:00 am-12:50 pm

1 stop4h 50m

$217

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Fri 10/17

7:30 pm-5:55 pm

1 stop23h 25m

Lambert-St Louis

Sun 10/19

9:47 am-6:58 pm

1 stop8h 11m

$270

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Thu 8/28

5:05 am-1:32 pm

2 stops9h 27m

Lambert-St Louis

Sun 8/31

2:30 pm-12:53 pm

2 stops21h 23m

$276

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Fri 8/15

1:00 pm-9:11 am

1 stop21h 11m

Lambert-St Louis

Sat 8/16

5:40 pm-5:53 pm

1 stop23h 13m

$281

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Wed 8/13

7:20 am-12:27 pm

1 stop6h 07m

Lambert-St Louis

Sun 8/17

8:00 am-3:18 pm

1 stop6h 18m

$437

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 8/26

12:14 pm-3:49 pm

1 stop4h 35m

$99

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Tue 8/26

7:30 am-1:10 pm

2 stops6h 40m

$104

IndianapolisSt. Louis

IND - STL

INDSTL

Indianapolis

Thu 9/25

6:00 am-9:59 am

1 stop4h 59m

$108

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 14 results
1
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Best time to book a flight from Indianapolis to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Indianapolis with our price prediction graph.
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.

Cheapflights Insights

Everything you need to know about your flight from Indianapolis to St. Louis

What is the cheapest month to book a flight from Indianapolis to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Indianapolis to St. Louis (average of $311). Flying from Indianapolis to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IND to STL?

Find hourly flight availability from Indianapolis to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

A simple way to save on the total cost of your ticket is to fly from Indianapolis to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 16% on your trip compared to booking a flight at noon.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated July 30, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from Indianapolis to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Spirit Airlines
6.3
Okay
8,048 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from Indianapolis to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Indianapolis to St. Louis round-trip?

    Flying on American Airlines is currently your cheapest option to St. Louis, with prices starting at $204. Additional round-trip tickets that might be worth considering are offered by Southwest and Delta, with the lowest prices starting at $211 and $217, respectively. American Airlines is 46% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Indianapolis to St. Louis one-way?

    The cheapest airlines for a one-way flight from Indianapolis to St. Louis are Delta ($108), American Airlines ($129), and Spirit Airlines ($133).

  • Can I find deals for flights from Indianapolis to St. Louis that include hotel bookings?

    Yes. In addition to deals on Indianapolis to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Indianapolis to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Indianapolis to St. Louis.

  • Can I find deals for business class flights from Indianapolis to St. Louis?

    Yes. Cheapflights offers flight deals from Indianapolis to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Indianapolis to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Indianapolis to St. Louis (average of $311). Flying from Indianapolis to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Festus
Farmington

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Alternative routes for Indianapolis to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Indianapolis to St. Louis

Discover the top 3 airlines that operate flights from Indianapolis to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$216Average$366FlexibilityNo cancel feeOn-time69%
DeltaCheapest$226Average$438FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$248Average$326FlexibilityNo cancel feeOn-time71%

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