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$254+ Cheap flights from Rapid City to St. Louis (RAP - STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — STL
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$254
(United Airlines)

Popular in

March

Cheapest in

September

Average price

$278
From Rapid City to Lambert-St Louis
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Highest demand for flights based on searches. 27% potential increase in price ($163 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/10. 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 9/275:30 amRAP - STL
1 stop6h 14mUnited Airlines
Sun 10/55:15 amSTL - RAP
1 stop6h 42mUnited Airlines
Deal found 9/10$254
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 9/251:44 pmRAP - STL
1 stop4h 58mUnited Airlines
Mon 9/295:15 amSTL - RAP
1 stop4h 55mUnited Airlines
Deal found 9/10$259
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/1610:00 amRAP - STL
1 stop5h 33mUnited Airlines
Mon 9/225:15 amSTL - RAP
1 stop4h 51mUnited Airlines
Deal found 9/11$324
This Delta deal was found by Cheapflights users on 9/10. 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 10/286:05 amRAP - STL
1 stop4h 29mDelta
Fri 10/314:45 pmSTL - RAP
1 stop6h 51mDelta
Deal found 9/10$345
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/268:30 amRAP - STL
1 stop7h 02mUnited Airlines
Tue 9/304:50 pmSTL - RAP
1 stop6h 22mUnited Airlines
Deal found 9/11$370
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/285:15 amRAP - STL
2 stops8h 10mUnited Airlines
Fri 10/3110:00 amSTL - RAP
2 stops9h 43mUnited Airlines
Deal found 9/10$434
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Sun 10/57:00 amRAP - STL
1 stop4h 44mUnited Airlines
Thu 10/95:15 amSTL - RAP
1 stop6h 42mUnited Airlines
Deal found 9/10$451

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 September 11, 2025.
Use the filters below to find and compare flights from Rapid City to St. Louis that are best for you.

Fly from

Rapid City

Fly to

St. Louis

Route

Depart

Return

Price

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 9/27

5:30 am-12:44 pm

1 stop6h 14m

Lambert-St Louis

Sun 10/5

5:15 am-10:57 am

1 stop6h 42m

$254

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 9/25

1:44 pm-7:42 pm

1 stop4h 58m

Lambert-St Louis

Mon 9/29

5:15 am-9:10 am

1 stop4h 55m

$259

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 9/16

10:00 am-4:33 pm

1 stop5h 33m

Lambert-St Louis

Mon 9/22

5:15 am-9:06 am

1 stop4h 51m

$324

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 10/28

6:05 am-11:34 am

1 stop4h 29m

Lambert-St Louis

Fri 10/31

4:45 pm-10:36 pm

1 stop6h 51m

$345

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 9/26

8:30 am-4:32 pm

1 stop7h 02m

Lambert-St Louis

Tue 9/30

4:50 pm-10:12 pm

1 stop6h 22m

$370

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sun 10/5

7:00 am-12:44 pm

1 stop4h 44m

Lambert-St Louis

Thu 10/9

5:15 am-10:57 am

1 stop6h 42m

$451

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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, August is the cheapest month in which you can book a flight from Rapid City to St. Louis (average of $311). Flying from Rapid City 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.

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 September 11, 2025.
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
8.0
Very good
7,960 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $254, United Airlines can have you in St. Louis from Rapid City in 6h 14m. The distance between Rapid City and St. Louis is about 751 mi.

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

    Delta, at $248, 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 43% 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, August is the cheapest month in which you can book a flight from Rapid City to St. Louis (average of $311). Flying from Rapid City 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
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$248Average$333FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$408FlexibilityNo cancel feeOn-time69%

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