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$201+ 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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — STL
Aug 24 — Aug 311
Mon 8/24
Mon 8/31
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 July 25, 2026.

This American Airlines deal was found by Cheapflights users on 7/22. 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.
Thu 9/244:56 pm
RAP
-
STL
1 stop5h 47m
American Airlines
Sun 9/277:27 am
STL
-
RAP
1 stop4h 48m
American Airlines
Deal found 7/22$309
This United Airlines deal was found by Cheapflights users on 7/23. 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 8/71:35 pm
RAP
-
STL
1 stop6h 51m
United Airlines
Tue 8/115:10 am
STL
-
RAP
1 stop5h 18m
United Airlines
Deal found 7/23$349
This Delta deal was found by Cheapflights users on 7/24. 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.
Fri 8/74:30 pm
RAP
-
STL
1 stop5h 56m
Delta
Tue 8/115:34 pm
STL
-
RAP
1 stop6h 03m
Delta
Deal found 7/24$359
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/1811:22 am
RAP
-
STL
1 stop4h 12m
United Airlines
Mon 8/2412:59 pm
STL
-
RAP
2 stops8h 38m
United Airlines
Deal found 7/20$371
This United Airlines deal was found by Cheapflights users on 7/24. 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.
Thu 8/65:53 pm
RAP
-
STL
1 stop5h 04m
United Airlines
Sun 8/95:10 am
STL
-
RAP
1 stop7h 20m
United Airlines
Deal found 7/24$379
This United Airlines deal was found by Cheapflights users on 7/21. 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 11/127:00 am
RAP
-
STL
1 stop4h 37m
United Airlines
Mon 11/163:15 pm
STL
-
RAP
2 stops7h 53m
United Airlines
Deal found 7/21$384
This Delta deal was found by Cheapflights users on 7/24. 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 8/34:30 pm
RAP
-
STL
1 stop5h 56m
Delta
Tue 8/115:34 pm
STL
-
RAP
1 stop6h 03m
Delta
Deal found 7/24$389
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/295:00 am
RAP
-
STL
1 stop6h 40m
United Airlines
Tue 9/110:53 am
STL
-
RAP
2 stops12h 40m
United Airlines
Deal found 7/20$394

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 July 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$309
(American Airlines)

One-way from

$201
(Kiwi.com)

Popular in

May

Cheapest in

January

Average price

$482
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. 19% potential increase in price ($102 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 25, 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
Quickest round-trip

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/9

4:31 pm-11:16 pm

1 stop5h 45m

Lambert-St Louis

Wed 9/30

6:15 am-10:01 am

1 stop4h 46m

$309

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 9/24

4:56 pm-11:43 pm

1 stop5h 47m

Lambert-St Louis

Sun 9/27

7:27 am-11:15 am

1 stop4h 48m

$309

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 11/12

4:00 pm-11:18 pm

1 stop6h 18m

Lambert-St Louis

Mon 11/16

9:45 am-3:46 pm

1 stop7h 01m

$319

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 8/7

1:35 pm-9:26 pm

1 stop6h 51m

Lambert-St Louis

Tue 8/11

5:10 am-9:28 am

1 stop5h 18m

$349

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 8/18

11:22 am-4:34 pm

1 stop4h 12m

Lambert-St Louis

Mon 8/24

12:59 pm-8:37 pm

2 stops8h 38m

$371

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 11/12

7:00 am-12:37 pm

1 stop4h 37m

Lambert-St Louis

Mon 11/16

3:15 pm-10:08 pm

2 stops7h 53m

$384

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 8/29

5:00 am-12:40 pm

1 stop6h 40m

Lambert-St Louis

Tue 9/1

10:53 am-10:33 pm

2 stops12h 40m

$394
Cheapest one-way

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 8/14

10:01 pm-2:56 pm

2 stops15h 55m

$201

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sun 9/13

3:34 pm-9:40 am

3 stops41h 06m

$204
Quickest one-way

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Mon 9/7

1:31 pm-10:00 pm

1 stop7h 29m

$300

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 12 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 July.
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

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

Airfare is below average for this route at the moment.

Rapid City to St. Louis flights typically cost between $411 and $484 in September.
The cheapest round-trip price found within the last 5 days was $309 on American Airlines (Sep 24-Sep 27).

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 25, 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
7.8
Good
8,482 reviews

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.8

Boarding

8.1

Overall

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,482 reviews
Delta
7.8
Good
8,482 reviews

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.8

Boarding

8.1

Overall

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
10,026 reviews
Delta
7.8
Good
8,482 reviews

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.8

Boarding

8.1

Overall

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 $309, Delta can have you in St. Louis from Rapid City in 5h 45m. 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 $208, 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 51% 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.

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
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington

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 July 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$208Average$323FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$413FlexibilityNo cancel feeOn-time69%

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