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St. Louis

$178+ Cheap flights from Rapid City to St. Louis (RAP - 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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — STL
May 28 — Jun 41
Thu 5/28
Thu 6/4
1 adult, Economy
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Cheap flight deals from Rapid City to St. Louis

Cheapest flights from Rapid City to St. Louis
Explore the most affordable flight options available from Rapid City to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 28, 2026.

This Delta deal was found by Cheapflights users on 4/24. 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 5/96:50 am
RAP
-
STL
2 stops9h 26m
Delta
Wed 5/135:36 pm
STL
-
RAP
1 stop5h 47m
Delta
Deal found 4/24$344
This United Airlines deal was found by Cheapflights users on 4/27. 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 7/116:00 am
RAP
-
STL
1 stop5h 07m
United Airlines
Wed 7/154:48 pm
STL
-
RAP
1 stop6h 37m
United Airlines
Deal found 4/27$360
This United Airlines deal was found by Cheapflights users on 4/24. 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 5/98:25 am
RAP
-
STL
1 stop5h 03m
United Airlines
Wed 5/135:59 pm
STL
-
RAP
1 stop4h 56m
United Airlines
Deal found 4/24$363
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/261:35 pm
RAP
-
STL
1 stop6h 46m
United Airlines
Tue 6/26:00 am
STL
-
RAP
1 stop5h 24m
United Airlines
Deal found 4/27$372
This American Airlines deal was found by Cheapflights users on 4/27. 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.
Sat 7/114:55 pm
RAP
-
STL
1 stop6h 03m
American Airlines
Wed 7/155:29 am
STL
-
RAP
1 stop5h 18m
American Airlines
Deal found 4/27$385
This Delta deal was found by Cheapflights users on 4/24. 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.
Mon 5/256:50 am
RAP
-
STL
1 stop6h 41m
Delta
Mon 6/16:21 am
STL
-
RAP
1 stop5h 12m
Delta
Deal found 4/24$388
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/262:04 pm
RAP
-
STL
2 stops28h 19m
Multiple Airlines
Tue 6/24:19 pm
STL
-
RAP
1 stop19h 47m
Multiple Airlines
Deal found 4/27$421
This Delta deal was found by Cheapflights users on 4/27. 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.
Tue 5/262:36 pm
RAP
-
STL
2 stops8h 23m
Delta
Tue 6/25:36 pm
STL
-
RAP
1 stop5h 48m
Delta
Deal found 4/27$428
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Fri 7/105:53 pm
RAP
-
STL
1 stop5h 04m
United Airlines
Wed 7/154:48 pm
STL
-
RAP
1 stop6h 37m
United Airlines
Deal found 4/27$454

Find flight deals from Rapid City to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Rapid City (RAP) 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 April 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$344
(Delta)

One-way from

$178
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$498
Provider with most accurate pricing for Rapid City-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Rapid City-Lambert-St Louis flights.
Search Deals
From Rapid City to Lambert-St Louis
Search Deals
One-way flight from Rapid City to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Rapid City 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 April 28, 2026.
Use the filters below to find and compare flights from Rapid City to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/9

6:50 am-5:16 pm

2 stops9h 26m

Lambert-St Louis

Wed 5/13

5:36 pm-10:23 pm

1 stop5h 47m

$344

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 7/11

6:00 am-12:07 pm

1 stop5h 07m

Lambert-St Louis

Wed 7/15

4:48 pm-10:25 pm

1 stop6h 37m

$360

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 5/26

1:35 pm-9:21 pm

1 stop6h 46m

Lambert-St Louis

Tue 6/2

6:00 am-10:24 am

1 stop5h 24m

$372

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Mon 5/25

6:50 am-2:31 pm

1 stop6h 41m

Lambert-St Louis

Mon 6/1

6:21 am-10:33 am

1 stop5h 12m

$388

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 5/26

4:33 pm-11:21 pm

1 stop5h 48m

Lambert-St Louis

Tue 6/2

5:36 pm-10:24 pm

1 stop5h 48m

$388

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/9

2:35 pm-8:43 pm

1 stop5h 08m

Lambert-St Louis

Wed 5/13

2:35 pm-7:15 pm

1 stop5h 40m

$419

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 5/14

2:35 pm-8:43 pm

1 stop5h 08m

Lambert-St Louis

Tue 5/19

8:46 am-9:23 am

1 stop25h 37m

$504
Quickest round-trip

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 5/14

2:35 pm-8:43 pm

1 stop5h 08m

Lambert-St Louis

Fri 5/15

5:59 pm-9:55 pm

1 stop4h 56m

$535
Cheapest one-way

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 6/10

4:30 pm-11:23 pm

1 stop5h 53m

$181

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 6/9

2:59 pm-11:56 pm

2 stops7h 57m

$186

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

Compare providers for flights from Rapid City to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Rapid City to St. Louis in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Rapid City-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Rapid City-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Rapid City-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Rapid City-St. Louis 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 Rapid City-St. Louis 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 Rapid City to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Rapid City 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 Rapid City to St. Louis

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

Currently, January is the cheapest month in which you can book a flight from Rapid City to St. Louis (average of $243). Flying from Rapid City to St. Louis in April is currently the most expensive (average of $498). 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.

How much does it cost to fly round-trip from Rapid City to St. Louis?

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 April 28, 2026.
Get a feel of what it's like to fly with Delta and United Airlines from Rapid City to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,467 reviews

Crew

8.5

Food

7.2

Comfort

7.9

Entertainment

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,467 reviews
Delta
7.9
Good
8,467 reviews

Crew

8.5

Food

7.2

Comfort

7.9

Entertainment

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,672 reviews
Delta
7.9
Good
8,467 reviews

Crew

8.5

Food

7.2

Comfort

7.9

Entertainment

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

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

  • How long is the flight from Rapid City to St. Louis?

    For as low as $360, Delta can have you in St. Louis from Rapid City in 5h 07m. The distance between Rapid City and St. Louis is about 751 mi. This flight may include one or multiple stops.

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

    Delta, at $174, was found to be the cheapest airline from Rapid City to St. Louis. An alternate airline flying to your destination would be United Airlines. Delta is currently priced 55% below the average price you’ll pay for this route.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Rapid City 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 Rapid City to St. Louis?

    Currently, January is the cheapest month in which you can book a flight from Rapid City to St. Louis (average of $243). Flying from Rapid City to St. Louis in April is currently the most expensive (average of $498). 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
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Rapid City to St. Louis

Discover the top 2 airlines that operate flights from Rapid City 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 April 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$327FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$257Average$378FlexibilityNo cancel feeOn-time69%

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